OpenVPN 2.0.x

Copyright (C) 2002-2008 OpenVPN, Inc.

$Id: ChangeLog 1330 2006-10-01 11:45:06Z james $

2006.10.01 -- Version 2.0.9

* Windows installer updated with OpenSSL 0.9.7l DLLs to fix
published vulnerabilities.

* Fixed TAP-Win32 bug that caused BSOD on Windows Vista
(Henry Nestler). The TAP-Win32 driver has now been
upgraded to version 8.4.

2006.09.12 -- Version 2.0.8

* Windows installer updated with OpenSSL 0.9.7k DLLs to fix
RSA Signature Forgery (CVE-2006-4339).
* No changes to OpenVPN source code between 2.0.7 and 2.0.8.

2006.04.12 -- Version 2.0.7

* Code added in 2.0.6-rc1 to extend byte counters
to 64 bits caused a bug in the Windows version which has now
been fixed. The bug could cause intermittent crashes.

2006.04.05 -- Version 2.0.6

* Security Vulnerability affecting OpenVPN 2.0 through 2.0.5.
An OpenVPN client connecting to a
malicious or compromised server could potentially receive
"setenv" configuration directives from the server which could
cause arbitrary code execution on the client via a LD_PRELOAD
attack. A successful attack appears to require that (a) the
client has agreed to allow the server to push configuration
directives to it by including "pull" or the macro "client" in
its configuration file, (b) the client configuration file uses
a scripting directive such as "up" or "down", (c) the client
succesfully authenticates the server, (d) the server is
malicious or has been compromised and is under the control of
the attacker, and (e) the attacker has at least some level of
pre-existing control over files on the client (this might be
accomplished by having the server respond to a client web
request with a specially crafted file). Credit: Hendrik Weimer.

The fix is to disallow "setenv" to be pushed to clients from
the server. For those who need this capability, OpenVPN
2.1 supports a new "setenv-safe" directive which is free
of this vulnerability.

* When deleting routes under Linux, use the route metric
as a differentiator to ensure that the route teardown
process only deletes the identical route which was originally
added via the "route" directive (Roy Marples).

* Fix the file in FreeBSD 4 jails
(Matthias Andree, Dirk Meyer, Vasil Dimov).

* Extended tun device configure code to support ethernet
bridging on NetBSD (Emmanuel Kasper).

2006.01.03 -- Version 2.0.6-rc1

* Fixed bug where "make check" inside a FreeBSD "jail"
would never complete (Matthias Andree).
* Fixed bug where --server directive in --dev tap mode
claimed that it would support subnets of /30 or less
but actually would only accept /29 or less.
* Extend byte counters to 64 bits (M. van Cuijk).
* Fixed bug in acinclude.m4 where capability of compiler
to handle zero-length arrays in structs is tested
(David Stipp).
* Fixed typo in manage.c where inline function declaration
was declared without the "static" keyword (David Stipp).
* Removed redundant base64 code.
* Better sanity checking of --server and --server-bridge
IP pool ranges, so as not to hit the assertion at
pool.c:119 (2.0.5).
* Fixed bug where --daemon and --management-query-passwords
used together would cause OpenVPN to block prior to
* Fixed client/server race condition which could occur
when --auth-retry interact is set and the initially
provided auth-user-pass credentials are incorrect,
forcing a username/password re-query.
* Fixed bug where if --daemon and --management-hold are
used together, --user or --group options would be ignored.

2005.11.02 -- Version 2.0.5

* Fixed bug in Linux get_default_gateway function
introduced in 2.0.4, which would cause redirect-gateway
on Linux clients to fail.
* Restored easy-rsa/2.0 tree (backported from 2.1 beta
series) which accidentally disappeared in
2.0.2 -> 2.0.4 transition.

2005.11.01 -- Version 2.0.4

* Security fix -- Affects non-Windows OpenVPN clients of
version 2.0 or higher which connect to a malicious or
compromised server. A format string vulnerability
in the foreign_option function in options.c could
potentially allow a malicious or compromised server
to execute arbitrary code on the client. Only
non-Windows clients are affected. The vulnerability
only exists if (a) the client's TLS negotiation with
the server succeeds, (b) the server is malicious or
has been compromised such that it is configured to
push a maliciously crafted options string to the client,
and (c) the client indicates its willingness to accept
pushed options from the server by having "pull" or
"client" in its configuration file (Credit: Vade79).
* Security fix -- Potential DoS vulnerability on the
server in TCP mode. If the TCP server accept() call
returns an error status, the resulting exception handler
may attempt to indirect through a NULL pointer, causing
a segfault. Affects all OpenVPN 2.0 versions.
* Fix attempt of assertion at multi.c:1586 (note that
this precise line number will vary across different
versions of OpenVPN).
* Added ".PHONY: plugin" to to work around
"make dist" issue.
* Fixed double fork issue that occurs when --management-hold
is used.
* Moved TUN/TAP read/write log messages from --verb 8 to 6.
* Warn when multiple clients having the same common name or
username usurp each other when --duplicate-cn is not used.
* Modified Windows and Linux versions of get_default_gateway
to return the route with the smallest metric
if multiple entries are present.

2005.09.25 -- Version 2.0.3-rc1

* openvpn_plugin_abort_v1 function wasn't being properly
registered on Windows.
* Fixed a bug where --mode server --proto tcp-server --cipher none
operation could cause tunnel packet truncation.

2005.08.25 -- Version 2.0.2

* No change from 2.0.2-rc1.

2005.08.24 -- Version 2.0.2-rc1

* Fixed regression bug in Win32 installer, introduced in 2.0.1,
which incorrectly set OpenVPN service to autostart.
* Don't package source code zip file in Windows installer
in order to reduce the size of the installer. The source
zip file can always be downloaded separately if needed.
* Fixed bug in route.c in FreeBSD, Darwin, OpenBSD and NetBSD
version of get_default_gateway. Allocated socket for route
manipulation is never freed so number of mbufs continuously
grow and exhaust system resources after a while (Jaroslav Klaus).
* Fixed bug where "--proto tcp-server --mode p2p --management
host port" would cause the management port to not respond until
the OpenVPN peer connects.
* Modified pkitool script to be /bin/sh compatible (Johnny Lam).

2005.08.16 -- Version 2.0.1

* Security Fix -- DoS attack against server when run with "verb 0" and
without "tls-auth". If a client connection to the server fails
certificate verification, the OpenSSL error queue is not properly
flushed, which can result in another unrelated client instance on the
server seeing the error and responding to it, resulting in disconnection
of the unrelated client (CAN-2005-2531).
* Security Fix -- DoS attack against server by authenticated client.
This bug presents a potential DoS attack vector against the server
which can only be initiated by a connected and authenticated client.
If the client sends a packet which fails to decrypt on the server,
the OpenSSL error queue is not properly flushed, which can result in
another unrelated client instance on the server seeing the error and
responding to it, resulting in disconnection of the unrelated client
(CAN-2005-2532). Credit: Mike Ireton.
* Security Fix -- DoS attack against server by authenticated client.
A malicious client in "dev tap" ethernet bridging mode could
theoretically flood the server with packets appearing to come from
hundreds of thousands of different MAC addresses, causing the OpenVPN
process to deplete system virtual memory as it expands its internal
routing table. A --max-routes-per-client directive has been added
(default=256) to limit the maximum number of routes in OpenVPN's
internal routing table which can be associated with a given client
* Security Fix -- DoS attack against server by authenticated client.
If two or more client machines try to connect to the server at the
same time via TCP, using the same client certificate, and when
--duplicate-cn is not enabled on the server, a race condition can
crash the server with "Assertion failed at mtcp.c:411"
* Fixed server bug where under certain circumstances, the client instance
object deletion function would try to delete iroutes which had never been
added in the first place, triggering "Assertion failed at mroute.c:349".
* Added --auth-retry option to prevent auth errors from being fatal
on the client side, and to permit username/password requeries in case
of error. Also controllable via new "auth-retry" management interface
command. See man page for more info.
* Added easy-rsa 2.0 scripts to the tarball in easy-rsa/2.0
* Fixed bug in openvpn.spec where rpmbuild --define 'without_pam 1'
would fail to build.
* Implement "make check" to perform loopback tests (Matthias Andree).

2005.07.21 -- Version 2.0.1-rc7

* Support LZO 2.01 which renamed its library to lzo2 (Matthias Andree).
* Include linux/types.h before checking for linux/errqueue.h (Matthias

2005.07.15 -- Version 2.0.1-rc6

* Commented out "user nobody" and "group nobody" in sample
client/server config files.
* Allow '@' character to be used in --client-config-dir
file names.

2005.07.04 -- Version 2.0.1-rc5

* Windows version will log a for-further-info URL when
initialization sequence is completed with errors.
* Added DLOPEN_PAM parameter to plugin/auth-pam/Makefile
to control whether auth-pam plugin links to PAM via
dlopen or -lpam. By default, DLOPEN_PAM=1 so pre-existing
behavior should be preserved. DLOPEN_PAM=0 is the preferred
setting to link via -lpam, but DLOPEN_PAM=1 works around
a bug in SuSE 9.1 (and possibly other distros as well)
where the PAM modules are not linked with -lpam. See
thread on openvpn-devel for more discussion about this
patch (Simon Perreault).

2005.06.15 -- Version 2.0.1-rc4

* Support LZO 2.00, including changes to configure script to
autodetect LZO version.

2005.06.12 -- Version 2.0.1-rc3

* Fixed a bug which caused standard file handles to not be closed
after daemonization when --plugin and --daemon are used together,
and if the plugin initialization function forks (as does auth-pam
and down-root) (Simon Perreault).
* Added client-side up/down scripts in contrib/pull-resolv-conf
for accepting server-pushed "dhcp-option DOMAIN" and "dhcp-option DNS"
on Linux/Unix systems (Jesse Adelman).
* Fixed bug where if client-connect scripts/plugins were cascaded,
and one (but not all) of them returned an error status, there might
be cases where for an individual script/plugin, client-connect was
called but not client-disconnect. The goal of this fix is to
ensure that if client-connect is called on a given client instance,
then client-disconnect will definitely be called. A potential
complication of this fix is that when client-connect functions are
cascaded, it's possible that the client-disconnect function would
be called in cases where the related client-connect function returned
an error status. This fix should not alter OpenVPN behavior when
scripts/plugins are not cascaded.
* Changed the hard-to-reproduce "Assertion failed at fragment.c:312"
fatal error to a warning: "FRAG: outgoing buffer is not empty".
Need more info on how to reproduce this one.
* When --duplicate-cn is used, the --ifconfig-pool allocation
algorithm will now allocate the first available IP address.
* When --daemon and --management-hold are used together,
OpenVPN will daemonize before it enters the management hold state.

2005.05.16 -- Version 2.0.1-rc2

* Modified vendor test in openvpn.spec file to match against
"Mandrakesoft" in addition to "MandrakeSoft".
* Using --iroute in a --client-config-dir file while in --dev tap
mode is not currently supported and will produce a warning
message. Fixed bug where in certain cases, in addition to
generating a warning message, this combination of options
would also produce a fatal assertion in mroute.c.
* Pass --auth-user-pass username to server-side plugin without
performing any string remapping (plugins, unlike scripts,
don't get any security benefit from string remapping).
This is intended to fix an issue with openvpn-auth-pam/pam_winbind
where backslash characters in a username ('\') were being remapped
to underscore ('_').
* Updated OpenSSL DLLs in Windows build to 0.9.7g.
* Documented --explicit-exit-notify in man page.
* --explicit-exit-notify seconds parameter defaults to 1 if

2005.04.30 -- Version 2.0.1-rc1

* Fixed bug where certain kinds of fatal errors after
initialization (such as port in use) would leave plugin
processes (such as openvpn-auth-pam) still running.
* Added optional openvpn_plugin_abort_v1 plugin function for
closing initialized plugin objects in the event of a fatal
error by main OpenVPN process.
* When the --remote list is > 1, and --resolv-retry is not
specified (meaning that it defaults to "infinite"), apply the
infinite timeout to the --remote list as a whole, but try each
list item only once before moving on to the next item.
* Added new --syslog directive which redirects output
to syslog without requiring the use of the --daemon or --inetd
* Added openvpn.spec option to allow RPM to be built with support
for passwords read from a file:
rpmbuild -tb [openvpn.x.tar.gz] --define 'with_password_save 1'

2005.04.17 -- Version 2.0

* Fixed minor options string typo in options.c.

2005.04.10 -- Version 2.0-rc21

* Change license description from "GPL Version 2 or (at your
option) any later version" to just "GPL Version 2".

2005.04.04 -- Version 2.0-rc20

* Dag Wieers has put together an OpenVPN/LZO binary RPM set with
excellent distro/version coverage for RH/EL/Fedora, though
using his own SPEC. I modified openvpn.spec to follow some of
the same conventions such as putting sample scripts and doc
files in %doc rather than /usr/share/openvpn.
* Minor change to init scripts to run the user-defined script
/etc/openvpn/openvpn-startup (if it exists) before any OpenVPN
configs are started, and to run /etc/openvpn/openvpn-shutdown
after all OpenVPN configs have been stopped. The
openvpn-startup script can be used for stuff like
insmod tun.o, setting up firewall rules, or starting
ethernet bridges.

2005.03.29 -- Version 2.0-rc19

* Omit additions of routes where the network and
gateway are equal and the netmask is
This can come up if you are using both
server/ifconfig-pool and client-config-dir with
ifconfig-push static addresses for some subset of clients
which directly reference the server IP address as the
remote endpoint.

2005.03.28 -- Version 2.0-rc18

* Packaged Windows installer with OpenSSL 0.9.7f.
* Built Windows installer with NSIS 2.06.

2005.03.12 -- Version 2.0-rc17

* "MANAGEMENT: CMD" log file output will now only occur
at --verb 7 or greater.
* Added an optional name/value configuration list to
the openvpn-auth-pam plugin module argument list. See
plugin/auth-pam/README for documentation. This is necessary
in order for openvpn-auth-pam to work with queries generated
by arbitrary PAM modules.
* In both auth-pam and down-root plugins, in the forked process,
a read error on the parent process socket is no longer fatal.
* MandrakeSoft liblzo1 RPM only Provides for a 'liblzo1'.
A conditional test of the vendor has been added to
Require the appropriately named 'lzo' (liblzo1 / lzo).
(Tom Walsh -

2005.02.20 -- Version 2.0-rc16

* Fixed bug introduced in rc13 where Windows service wrapper
would be installed with a startup type of Automatic.
This fix restores the previous behavior of installing
with a startup type of Manual.

2005.02.19 -- Version 2.0-rc15

* Added warning when --keepalive is not used in a server
* Don't include OpenSSL md4.h file if we are not building
NTLM proxy support (Waldemar Brodkorb).
* Added easy-rsa/build-key-pkcs12 and
easy-rsa/Windows/build-key-pkcs12.bat scripts
(Mathias Sundman).

2005.02.16 -- Version 2.0-rc14

* Fixed small memory leak that occurs when --crl-verify
is used.
* Upgraded Windows installer and .nsi script to NSIS 2.05
(Mathias Sundman).
* Changed #include backslash usage in cryptoapi.c to use
forward slashes instead (Gisle Vanem).
* Created easy-rsa/revoke-full to handle revocations in
a single step: (a) revoke crt, (b) regenerate CRL, and
(c) verify that revocation succeeded.
* Renamed easy-rsa/Windows/revoke-key to revoke-full so
that both *nix and Windows scripts are equivalent.

2005.02.11 -- Version 2.0-rc13

* Improve human-readability of local/remote options
diff, when inconsistencies are present.
* For Windows easy-rsa, distribute vars.bat.sample and
openssl.cnf.sample, then copy them to their normal
filenames (without the .sample) when init-config.bat
is run. This is to prevent OpenVPN upgrades from
wiping out vars.bat and openssl.cnf edits.
* Modified service wrapper (Windows) to use a
case-insensitive search when scanning for .ovpn files
in \Program Files\OpenVPN\config. Prior versions
required an all-lower-case .ovpn file extension.
* Miscellaneous service wrapper code cleanup.
* If --user/--group is used on Windows, treat it
as a no-op with a warning (this makes it easier to
distribute the same client config file to Windows
and *nix users).
* Warn if --ifconfig-pool-persist is used with

2005.02.05 -- Version 2.0-rc12

* Removed some debugging code inadvertently included
in rc11 which would print the --auth-user-pass
username/password provided by clients in the server
* Client code for cycling through --remote list will
retry the last address which successfully authenticated
before moving on through the list.
* Windows installer will now install sample configuration
files in \Program Files\OpenVPN\sample-configs as well
as generate a start menu shortcut to this directory.
* Minor type change in buffer.[ch] to work around char-type
ambiguity bug. Caused management interface lock-ups on
ARM when building with armv4b-hardhat-linux-gcc 2.95.3.

2005.02.03 -- Version 2.0-rc11

* Windows installer will now install easy-rsa directory
in \Program Files\OpenVPN
* Allow syslog facility to be controlled at compile time,
* Changed certain shell scripts in distribution to use
#!/bin/sh rather than #!/bin/bash for better portability.
* If --ifconfig-pool-persist seconds parameter is 0, treat
persist file as an allocation of fixed IP addresses
(previous versions took IP-to-common-name associations
from this list as hints, not mandatory static allocations).
* Fixed bug on *nix where if --auth-user-pass and --log
were used together, the username prompt would be sent to
the log file rather than /dev/tty.
* Spurious text in openvpn.8 detected by doclifter
(Eric S. Raymond).
* Call closelog later on daemon kill so that process
exit message is written to syslog.

2005.01.27 -- Version 2.0-rc10

* When ./configure is run with plugins enabled (the default),
check whether or not dlopen exists in libc before testing
for libdl. This is to fix an issue on FreeBSD and possibly
other OSes which bundle libdl functions in libc.
* On Windows, filter initial WSAEINVAL warning which occurs
on the initial read attempt of an unbound socket.
* The easy-rsa scripts build-key, build-key-pass, and
build-key-server will now chmod the .key file
to 0600. This is in addition to the fact the generated
keys directory has always been similarly protected
(Pete Harlan).

2005.01.23 -- Version 2.0-rc9

* Fixed error "ROUTE: route addition failed using
CreateIpForwardEntry ..." on Windows when --redirect-gateway
is used over a RRAS internet link.
* When using --route-method exe on Windows, include the
gateway parameter on route delete commands (Mathias Sundman).
* Try not to do a hard reset (i.e. SIGHUP) when two
SIGUSR1 signals are received in close succession.
* If the push list tries to grow beyond its buffer capacity,
the resulting error will be non-fatal.
* To increase the push list capacity (must be done on both
client and server), increase TLS_CHANNEL_BUF_SIZE in
common.h (default=1024).

2005.01.15 -- Version 2.0-rc8

* Fixed bug introduced in rc7 where options error
"--auth-user-pass requires --pull" might occur even
if --pull was correctly specified.
* Changed management interface code to bind once
to TCP socket, rather than rebinding after every
client disconnect.
* Added "disable" directive for client-config-dir
* Windows binary install is now distributed with
OpenSSL 0.9.7e.
* Query the management interface for --http-proxy
username/password if authfile is set to "stdin".
* Added current OpenVPN version number to "Unrecognized
option or missing parameter" error message.
* Added "-extensions server" to "openssl req" command
in easy-rsa/build-key-server (Nir Yeffet).

2005.01.10 -- Version 2.0-rc7

* Fixed bug in management interface which could cause
100% CPU utilization in --proto tcp-server mode
on all *nix OSes except for Linux 2.6.
* --ifconfig-push now accepts DNS names as well as
IP addresses.
* Added sanity check errors when --pull or
--auth-user-pass is used in an incorrect mode.
* Updated man page entries for --client-connect and
* Added "String Types and Remapping" section to man
page to consisely document the way which OpenVPN
may convert certain types of characters in strings
to ('_').
* Modified bridging description in HOWTO to emphasize
the fact that bridging allows Windows file and print
sharing without a WINS server (Charles Duffy).

2004.12.20 -- Version 2.0-rc6

* Improved checking for epoll support in ./configure
to fix false positive on RH9 (Jan Just Keijser).
* Made the "MULTI TCP: I/O wait required blocking in
multi_tcp_action, action=7" error nonfatal and replaced
with "MULTI: Outgoing TUN queue full, dropped packet".
So far the issue only seems to occur on Linux 2.2
in --mode server --proto tcp mode. It occurs when
the TUN/TAP driver locks up and refuses to accept
new packet writes for a second or more.
* Fixed bug where if a --client-config-dir file tried
to include another file using "config", and if that
include failed, OpenVPN would abort with a fatal
error. Now such inclusion failures will be logged
but are no longer fatal.
* Global changes to the way that packet buffer alignment
is handled. Previously we didn't care about alignment
and took care, when handling 16 and 32 bit words
in buffers, to always use alignment-safe transfers.
This approach appears to be inadequate on some
architectures such as alpha. The new approach is
to initialize packet buffers in a way that anticipates
how component structures will be allocated within
them, to maintain correct alignment.
* Added --dhcp-option DISABLE-NBT to disable NetBIOS
over TCP (Jan Just Keijser).
* Added --http-proxy-option directive for controlling
miscellaneous HTTP proxy options.
* Management state will no longer transition to "WAIT"
during TLS renegotiations.

2004.12.16 -- Version 2.0-rc5

* The --client-config-dir option will now try to open
a default file called "DEFAULT" if no file matching
the common name of the incoming client was found.
* The --client-connect script/plugin can now veto client
authentication by returning a failure code.
* The --learn-address script/plugin can now prevent a
client-instance/address association from being learned
by returning a failure code.
* Changed RPM group in .spec file to Applications/Internet.

2004.12.14 -- Version 2.0-rc4

* SuSE only -- Fixed interaction between openvpn.spec and
suse/openvpn.init where the .spec file was writing the
OpenVPN binary to a different location than where the
.init script was referencing it (Stefan Engel).
* Solaris only -- Split Solaris ifconfig command into two
parts (Jan Just Keijser).
* Some cleanup in add_option().
* Better error checking on input dotted quad IP addresses.
* Verify that --push argument is quoted, if there is
more than one.
* More miscellaneous option sanity checks.

2004.12.13 -- Version 2.0-rc3

* On Windows, when --log or --log-append is used,
save the original stderr for username and password
* Fixed a bug introduced in the late 2.0 betas where
if a "verb" parameter >= 16 was used, it would be
ignored and the actual verb level would remain at 1.
* Fixed a bug mostly seen on OS X where --management-hold
or --management-query-passwords would cause the management
interface to be unresponsive to incoming client connections.
* Trigger an options error if one of the management-modifying
options is used without "management" itself.

2004.12.12 -- Version 2.0-rc2

* Amplified warnings in documentation about possible
man-in-the-middle attack when clients do not properly
verify server certificate. Changes to easy-rsa README,
FAQ, HOWTO, man page, and sample client config file.
* Added a warning message if --tls-client or --client
is used without also specifying one of either
--ns-cert-type, --tls-remote, or --tls-verify.
* status_open() fixes for MSVC builds (Blaine Fleming).
* Fix attempt of "ntlm.c:55: error: `des_cblock' undeclared"
compiler error which has been reported on some platforms.
* The openvpn.spec file for rpmbuild has several
new build-time options. See comments in the file.
* Plugins are now built and packaged in the RPM and
will be saved in /usr/share/openvpn/plugin/lib.
* Added --management-hold directive to start OpenVPN
in a hibernating state until released by the
management interface. Also added "hold" command
to the management interface.

2004.12.07 -- Version 2.0-rc1

* openvpn.spec workaround for SuSE confusion regarding
/etc/init.d vs. /etc/rc.d/init.d (Stefan Engel).

2004.12.05 -- Version 2.0-beta20

* The ability to read --askpass and --auth-user-pass
passwords from a file has been disabled by default.
To re-enable, use ./configure --enable-password-save.
* Added additional pre-connected states to management
interface. See management/management-notes.txt
for more info.
* State history is now recorded by the management
interface, and the "state" command now works like
the log or echo commands.
* State history and real-time state change notifications
are now prepended with an integer unix timestamp.
* Added --http-proxy-timeout option, previously
the timeout was hardcoded to 5 seconds.

2004.12.02 -- Version 2.0-beta19

* Fixed bug in management interface line termination
where output lines incorrectly contained a \00 char
after the customary \0d \0a.
* Fixed bug introduced in beta18 where Windows version
would segfault on options errors.
* Fixed bug in management interface where an empty
quoted string ("") entered as a parameter would cause
a segfault.
* Fixed bug where --resolv-retry was not working
properly with multiple --remote hosts.
* Added additional ./configure options to reduce
executable size for embedded applications.
See ./configure --help.

2004.11.28 -- Version 2.0-beta18

* Added management interface. See new --management-*
options or the full management interface documentation
in management/management-notes.txt in the tarball.
Management interface inclusion can be disabled by
./configure --disable-management.
* Added two new plugin modules: auth-pam and down-root.
Auth-pam supports pam-based authentication using a
split privilege execution model, while down-root enables
a down script to be executed with root privileges, even
when --user/--group is used to drop root privileges.
See the plugin directory in the tarball for READMEs,
source code, and Makefiles.
* Plugin developers should note that some changes were
made to the plugin interface since beta17. See
openvpn-plugin.h for details.
Plugin interface inclusion can be disabled with
./configure --disable-plugins
* Added easy-rsa/build-key-server script which will
build a certificate with with nsCertType=server.
* Added --ns-cert-type option for verification
of nsCertType field in peer certificate.
* If --fragment n is specified and --mssfix is specified
without a parameter, default --mssfix to n. This restores
the 1.6 behavior when using --mssfix without a parameter.
* Fixed SSL context initialization bug introduced in beta14
where this error might occur on restarts: "Cannot load
certificate chain ... PEM_read_bio:no start line".

2004.11.11 -- Version 2.0-beta17

* Changed default port number to 1194 per IANA official
port number assignment.
* Added --plugin directive which allows compiled
modules to intercept script callbacks. See
plugin folder in tarball for more info.
* Fixed bug introduced in beta12 where --key-method 1
authentications which should have succeeded would fail.
* Ignore SIGUSR1 during DNS resolution.
* Added SuSE support to openvpn.spec (Umberto Nicoletti).
* Fixed --cryptoapicert SUBJ: parsing bug (Peter 'Luna'

2004.11.07 -- Version 2.0-beta16

* Modified sample-scripts/ to get username
and password from OpenVPN via a file rather than
via environmental variables.
* Added bytes_sent and bytes_received environmental
variables to be set prior to client-disconnect script.
* Changed client virtual IP derivation precedence:
(1) use --ifconfig-push directive from --client-connect
script, (2) use --ifconfig-push directive from
--client-config-dir, and (3) use --ifconfig-pool
* If a --client-config-dir file specifies --ifconfig-push,
it will be visible to the --client-connect-script in
the ifconfig_pool_remote_ip environmental variable.
* For tun-style tunnels, the ifconfig_pool_local_ip
environmental variable will be set, while for
tap-style tunnels, the ifconfig_pool_netmask variable
will be set.
* Added intelligence to autoconf script to test
compiler for the accepted form of zero-length arrays.
* Fixed a bug introduced in beta12 where --ip-win32
netsh would fail if --dev-node was not explicitly
* --ip-win32 netsh will now work on hidden adapters.
* Fix attempt of "Assertion failed at crypto.c:149".
This assertion has also been reported on 1.x with a
slightly different line number. The fix is twofold:
(1) In previous releases, --mtu-test may trigger this
assertion -- this bug has been fixed. (2) If something
else causes the assertion to be thrown, don't panic,
just output a nonfatal warning to the log and drop
the packet which generated the error.
* Support TAP interfaces on Mac OS X (Waldemar Brodkorb).
* Added --echo directive.
* Added --auth-nocache directive.

2004.10.28 -- Version 2.0-beta15

* Changed environmental variable character classes
so that names must consist of alphanumeric or
underbar chars and values must consist of printable
characters. Illegal chars will be deleted.
Versions prior to 2.0-beta12 were more restrictive
and would map spaces to '.'.
* On Windows, when the TAP adapter fails to
initialize with the correct IP address, output
"Initialization Sequence Completed with Errors"
to the console or log file.
* Added a warning when user/group/chroot is used
without persist-tun and persist-key.
* Added cryptoapi.[ch] to tarball and source zip.
* --tls-remote option now works with common name
prefixes as well as with the full X509 subject
string. This is a useful alternative to using
a CRL on the client.
* common names associated with a static
--ifconfig-push setting will no longer leave
any state in the --ifconfig-pool-persist file.
* Hard TLS errors (TLS handshake failed) will now
trigger either a SIGUSR1 signal by default
or SIGTERM (if --tls-exit is specified). In TCP
mode, all TLS errors are considered to be hard.
In server mode, the signal will be local to the
client instance.
* Added method parameter to --auth-user-pass-verify
directive to select whether username/password
is passed to script via environment or a temporary
* Added --status-version option to control format
of --status file. The --mode server
--status-version 2 format now includes a line
type token, the virtual IP address is shown
in the client list (even in --dev tap mode),
and the integer time_t value is shown anywhere
an ascii-formatted time/date is also shown.
* Added --remap-usr1 directive which can be used
to control whether internally or externally
generated SIGUSR1 signals are remapped to
SIGHUP (restart without persisting state) or
SIGTERM (exit).
* When running as a Windows service (using
--service option), check the exit event before
and after reading one line of input from
stdin, when reading username/password info.
* For developers: Extended the --gremlin function
to better stress-test the new 2.0 features,
added Valgrind support on Linux and Dmalloc
support on Windows.

2004.10.19 -- Version 2.0-beta14

* Fixed a bug introduced in Beta12 that would occur
if you use a --client-connect script without also
defining --tmp-dir.
* Fixed a bug introduced in Beta12 where a learn-address
script might segfault on the delete method.
* Added Crypto API support in Windows version via
the --cryptoapicert option (Peter 'Luna' Runestig).

2004.10.18 -- Version 2.0-beta13

* Fixed an issue introduced in Beta12 where the private
key password would not be prompted for unless --askpass
was explicitly specified in the config.

2004.10.17 -- Version 2.0-beta12

* Added support for username/password-based authentication.
Clients can now authentication themselves with the server
using either a certificate, a username/password, or both.
New directives: --auth-user-pass, --auth-user-pass-verify,
--client-cert-not-required, and --username-as-common-name.
* Added NTLM proxy patch (William Preston).
* Added --ifconfig-pool-linear server flag to allocate
individual tun addresses for clients rather than /30
subnets (won't work with Windows clients).
* Modified --http-proxy code to cache username/password
across restarts.
* Modified --http-proxy code to read username/password
from the console when the auth file is given as "stdin".
* Modified --askpass to take an optional filename argument.
* --persist-tun and --persist-key now work in client mode
and can be pushed to clients as well.
* Added --ifconfig-pool-persist directive, to maintain
ifconfig-pool info in a file which is persistent across
daemon instantiations.
* --user and --group privilege downgrades as well as
--chroot now also work in client mode (the
dowgrade/chroot will be delayed until the initialization
sequence is completed).
* Added --show-engines standalone directive to show
available OpenSSL crypto accelerator engine support.
* --engine directive now accepts an optional engine-ID
parameter to control which engine is used.
* "Connection reset, restarting" log message now shows
which client is being reset.
* Added --dhcp-pre-release directive in Windows version.
* Second parm to --ip-win32 can be "default", e.g.
--ip-win32 dynamic default 60.
* Fixed documentation bug regarding environmental
variable settings for --ifconfig-pool IP addresses.
The correct environmental variable names are:
ifconfig_pool_local_ip and ifconfig_pool_remote_ip.
* ifconfig_pool_local_ip and ifconfig_pool_remote_ip
environmental variables are now passed to the
client-disconnect script.
* In server mode, environmental variables are now scoped
according to the client they are associated with,
to solve the problem of "crosstalk" between different
client's environmental variable sets.
* Added --down-pre flag to cause --down script to be
called before TUN/TAP close (rather than after).
* Added --tls-exit flag which will cause OpenVPN
to exit on any TLS errors.
* Don't push a route to a client if it exactly
matches an iroute (this lets you push routes to
all clients, and OpenVPN will automatically remove
the route from the route push list only for that client
which the route actually belongs to).
* Made '--resolv-retry infinite' the default.
--resolv-retry can be disabled by using a parameter of 0.
* For clients which plan to pull config info from server,
set an initial default ping-restart of 60 seconds.
* Optimized mute code to lessen the load on the processor
when messages are being muted at a higher frequency.
* Made route log messages non-mutable.
* Silence the Linux "No buffer space available" message.
* Added miscellaneous additional option sanity checks.
* Added Windows version of easy-rsa scripts in
easy-rsa/Windows directory (Andrew J. Richardson).
* Added NetBSD route patch (Ed Ravin).
* Added OpenBSD patch for TAP + --redirect-gateway
(Waldemar Brodkorb).
* Directives which prompt for a username and/or password
will now work with --daemon (OpenVPN will prompt
before forking).
* Warn if CRL is from a different issuer than the
issuer of the peer certificate (Bernhard Weisshuhn).
* Changed init script chkconfig parameters to start
OpenVPN daemon(s) before NFS.
* Bug fix attempt of "too many I/O wait events" which occurs
on OSes which prefer select() over poll() such as Mac OS X.
* Added --ccd-exclusive flag. This flag will require, as a
condition of authentication, that a connecting client has
a --client-config-dir file.
* TAP-Win32 open code will attempt to open a free adapter
if --dev-node is not specified (Mathias Sundman).
* Resequenced --nice and --chroot ordering so that --nice
occurs first.
* Added --suppress-timestamps flag (Charles Duffy).
* Source code changes to allow compilation by MSVC
(Peter 'Luna' Runestig).
* Added experimental --fast-io flag which optimizes
TUN/TAP/UDP writes on non-Windows systems.

2004.08.18 -- Version 2.0-beta11

* Added --server, --server-bridge, --client, and
--keepalive helper directives. See client.conf
and server.conf in sample-config-files for sample
configurations which use the new directives.
* On Windows, added --route-method to control
whether IP Helper API or route.exe is used
to add/delete routes.
* On Windows, added a second parameter to
--route-delay to control the maximum time period
to wait for the TAP-Win32 adapter to come up
before adding routes.
* Fixed bug in Windows version where configurations
which omit --ifconfig might fail to recognize when
the TAP adapter is up.
* Proxy connection failures will now retry according
to the --connect-retry parameter.
* Fixed --dev null handling on Windows so that TLS
loopback test described in INSTALL file works
correctly on Windows.
* Added "Initialization Sequence Completed" message
after all initialization steps have been completed
and the VPN can be considered "up".
* Better sanity-checking on --ifconfig-pool parameters.
* Added --tcp-queue-limit option to control
TUN/TAP -> TCP socket overflow.
* --ifconfig-nowarn flag will now silence general
warnings about possible --ifconfig address
conflicts, including the warning about --ifconfig
and --remote addresses being in same /24 subnet.
* Fixed case where server mode did not correctly
identify certain types of ethernet multicast packets
(Marcel de Kogel).
* Added --explicit-exit-notify option (experimental).

2004.08.02 -- Version 2.0-beta10

* Fixed possible reference after free of option strings
after a restart, bug was introduced in beta8.
* Fixed segfault at route.c:919 in the beta9
Windows version that was being caused by indirection
through a NULL pointer.
* Mistakenly built debug version of TAP-Win32 driver
for beta9. Beta10 has correct release build.

2004.07.30 -- Version 2.0-beta9

* Fixed --route issue on Windows that was introduced with
the new beta8 route implementation based on the
IP Helper API.

2004.07.27 -- Version 2.0-beta8

* Added TCP support in server mode.
* Added PKCS #12 support (Mathias Sundman).
* Added patch to make revoke-crt and make-crl work
seamlessly within the easy-rsa environment (Jan Kiszka).
* Modified --mode server ethernet bridge code to forward
special IEEE 802.1d MAC Groups, i.e. 01:80:C2:XX:XX:XX.
* Added --dhcp-renew and --dhcp-release flags to Windows
version. Normally DHCP renewal and release on the TAP
adapter occurs automatically under Windows, however
if you set the TAP-Win32 adapter Media Status property
to "Always Connected", you may need these flags.
* Added --show-net standalone flag to Windows version to
show OpenVPN's view of the system adapter and routing
* Added --show-net-up flag to Windows version to output
the system routing table and network adapter list to
the log file after the TAP-Win32 adapter has been brought
up and any routes have been added.
* Modified Windows version to add routes using the IP Helper
API rather than by calling route.exe.
* Fixed bug where --route-up script was not being called
if no --route options were specified.
* Added --mute-replay-warnings to suppress packet replay
warnings. This is a common false alarm on WiFi nets.
* Added "def1" flag to --redirect-gateway option to override
the default gateway by using and
rather than This has the benefit of overriding
but not wiping out the original default gateway.
(Thanks to Jim Carter for pointing out this idea).
* You can now run OpenVPN with a single config file argument.
For example, you can now say "openvpn config.conf"
rather than "openvpn --config config.conf".
* On Windows, made --route and --route-delay more adaptive
with respect to waiting for interfaces referenced by the
route destination to come up. Routes added by --route
should now be added as soon as the interface comes up,
rather than after an obligatory 10 second delay. The
way this works internally is that --route-delay now
defaults to 0 on Windows. Previous versions would
wait for --route-delay seconds then add the routes.
This version will wait --route-delay seconds and then
test the routing table at one second intervals for the
next 30 seconds and will not add the routes until they
can be added without errors.
* On Windows, don't setsockopt SO_SNDBUF or SO_RCVBUF by
default on TCP/UDP socket in light of reports that this
action can have undesirable global side effects on the
MTU settings of other adapters. These parameters can
still be set, but you need to explicitly specify
--sndbuf and/or --rcvbuf.
* Added --max-clients option to limit the maximum number
of simultaneously connected clients in server mode.
* Added error message to illuminate shell escape gotcha when
single backslashes are used in Windows path names.
* Added optional netmask parm to --ifconfig-pool.
* Fixed bug where http-proxy connect retry attempts were
incorrectly going to the remote OpenVPN server,
not to the HTTP proxy server.

2004.06.29 -- Version 2.0-beta7

* Fixed bug in link_socket_verify_incoming_addr() which
under certain circumstances could have caused --float
behavior even if --float was not specified.
* --tls-auth option now works with --mode server.
All clients and the server should use the same
--tls-auth key when operating in client/server mode.
* Added --engine option to make use of OpenSSL-supported
crypto acceleration hardware.
* Fixed some high verbosity print format size issues
in event.c for 64 bit platforms (Janne Johansson).
* Made failure to open --log or --log-append file
a non-fatal error.

2004.06.23 -- Version 2.0-beta6

* Fixed Windows installer to intelligently put
up a reboot dialog only if tapinstall tells
us that it's really necessary.
* Fixed "Assertion failed at fragment.c:309"
bug when --mode server and --fragment are used
* Ignore HUP, USR1, and USR2 signals during
initialization. Prior versions would abort.
* Fixed bug on OS X: "Assertion failed at event.c:406".
* Added --service option to Windows version, for use
when OpenVPN is being programmatically instantiated
by another process (see man page for info).
* --log and --log-append options now work on Windows.
* Update OpenBSD INSTALL notes (Janne Johansson).
* Enable multicast on tun interface when running on
OpenBSD (Pavlin Radoslavov).
* Fixed recent --test-crypto breakage, where options
such as --cipher were not being parsed correctly.
* Modified options compatibility string by removing
ifconfig substring if it is empty. Incremented
options compatibility string version number to 4.
* Fixed typo in --tls-timeout option parsing
(Mikael Lonnroth).

2004.06.13 -- Version 2.0-beta5

* Fixed rare --mode server crash that could occur
if data was being routed to a client at
high bandwidth at the precise moment that the
client instance object on the server was being
* Fixed issue on machines which have epoll.h and
the epoll_create glibc call defined, but which
don't actually implement epoll in the kernel.
OpenVPN will now gracefully fall back to the
poll API in this case.
* Fixed Windows bug which would cause the following
error in a --mode server --dev tap configuration:
"resource limit WSA_MAXIMUM_WAIT_EVENTS has been
* Added CRL (certificate revocation list) management
scripts to easy-rsa directory (Jon Bendtsen).
* Do a better job of getting the ifconfig component
of the options consistency check to work correctly
when --up-delay is used.
* De-inlined some functions which were too complex
to be inlined anyway with gcc.
* If a --dhcp-option option is pushed to a non-windows
client, the option will be saved in the client's
environment before the --up script is called, under
the name "foreign_option_{n}".
* Added --learn-address script (see man page) which
allows for firewall access through the VPN to be
controlled based on the client common name.
* In mode --server mode, when a client connects to
the server, the server will disconnect any
still-active clients which use the same common
name. Use --duplicate-cn flag to revert to
previous behavior of allowing multiple clients
to concurrently connect with the same common name.

2004.06.08 -- Version 2.0-beta4

* Fixed issue with beta3 where Win32 service wrapper
was keying off of old TAP HWID as a dependency. To
ensure that the new service wrapper is correctly
installed, the Windows install script will uninstall
the old wrapper before installing the new one,
causing a reset of service properties.
* Fixed permissions issue on --status output file,
with default access permissions of owner read/write
only (default permissions can be changed of course with

2004.06.05 -- Version 2.0-beta3

* More changes to TAP-Win32 driver's INF file which
affects the placement of the driver in the Windows
device namespace. This is done to work around an
apparent bug in Windows when short HWIDs are used,
and will also ease the upgrade from 1.x to 2.0 by
reducing the chances that a reboot will be needed
on upgrade. Like beta2, this upgrade will
delete existing TAP-Win32 interfaces, and reinstall
a single new interface with default properties.
* Major rewrite of I/O event wait layer in the style
of libevent. This is a precursor to TCP support
in --mode server.
* New feature: --status. Outputs a SIGUSR2-like
status summary to a given file, updated once
per n seconds. The status file is comma delimited
for easy machine parsing.
* --ifconfig-pool now remembers common names and
will try to assign a consistent IP to a given
common name. Still to do: persist --ifconfig-pool
memory across restarts by saving state in file.
* Fixed bug in event timer queue which could cause
recurring timer events such as --ping to not
correctly schedule again after firing. This in
turn would cause spurrious ping restarts and possible
connection outages. Thanks to Denis Vlasenko for
tracking this down.
* Possible fix to reported bug where --daemon argument
was not printing to syslog correctly after restart.
* Fixed bug where pulling --route or --dhcp-option
directives from a server would problematically
interact with --persist-tun on the client.
* Updated contrib/multilevel-init.patch (Farkas Levente).
* Added RPM build option to .spec and files
to optionally disable LZO inclusion (Ian Pilcher).
* The latest MingW runtime and headers define
'ssize_t', so a patch is needed (Gisle Vanem).

2004.05.14 -- Version 2.0-beta2

* Fixed signal handling bug in --mode server, where
SIGHUP and SIGUSR1 were treated as SIGTERM.
* Changed the TAP-Win32 HWID from "TAP" to "TAPDEV".
Apparently the larger string may work around
a problem where the TAP adapter is sometimes missing
from the network connections panel, especially under
XP SP2. Also note that installing this upgrade will
uninstall any pre-existing TAP-Win32 adapters, and then
install a single new adapter, meaning that old adapter
properties will be lost. Thanks to Md5Chap for solving
this one.
* For --mode server --dev tap, the options --ifconfig and
--ifconfig-pool are now optional. This allows address
assignment via DHCP or use of a TAP VPN without
IP support, as has always been possible with 1.x.
* Fixed bug where --ifconfig may not work correctly on
Linux 2.2.
* Added 'local' flag to --redirect-gateway for use on
networks where both OpenVPN daemons are connected
to a shared subnet, such as wireless.

2004.05.09 -- Version 2.0-beta1

* Unchanged from test29 except for version number

2004.05.08 -- Version 2.0-test29

* Modified --dev-node on Windows to accept a TAP-Win32
GUID name. In addition, --show-adapters will now
display the high-level name and GUID of each adapter.
This is an attempt to work around an issue in Windows
where sometimes the TAP-Win32 adapter installs correctly
but has no icon in the network connections control
panel. In such cases, being able to specify
--dev-node {TAP-GUID} can work around the missing icon.

2004.05.07 -- Version 2.0-test28

* Fixed bug which could cause segfault on program
shutdown if --route and --persist-tun are used

2004.05.06 -- Version 2.0-test27

* Fixed bug in close_instance() which might cause
memory to be accessed after it had already been freed.
* Fixed bug in verify_callback() that might have
caused uninitialized data to be referenced.
* --iroute now allows full CIDR subnet routing.
* In "--mode server --dev tun" usage, source addresses
on VPN packets coming from a particular client must
be associated with that client in the OpenVPN internal
routing table.

2004.04.28 -- Version 2.0-test26

* Optimized broadcast path in multi-client mode.
* Added socket buffer size options --rcvbuf & --sndbuf.
* Configure Linux tun/tap driver to use a more sensible
txqueuelen default. Also allow explicit setting
via --txqueuelen option (Harald Roelle).
* The --remote option now allows the port number
to be specified as the second parameter. If
unspecified, the port number defaults to the
--rport value.
* Multiple --remote options on the client can now be
specified for load balancing and failover. The
--remote-random flag can be used to initially randomize
the --remote list for basic load balancing.
* If a remote DNS name resolves to multiple DNS addresses,
one will be chosen by random as a kind of basic
load-balancing feature if --remote-random is used.
* Added --connect-freq option to control maximum
new connection frequency in multi-client mode.
* In multi-client mode, all syslog messages associated
with a specific client now include a client-ID prefix.
* For Windows, use a gettimeofday() function based
on QueryPerformanceCounter (Derek Burdick).
* Fixed bug in interaction between --key-method 2
and DES ciphers, where dynamic keys would be generated
with bad parity and then be rejected.

2004.04.17 -- Version 2.0-test24

* Reworked multi-client broadcast handling.

2004.04.13 -- Version 2.0-test23

* Fixed bug in --dev tun --client-to-client routing.
* Fixed a potential deadlock in --pull.
* Fixed a problem with select() usage which could
cause a repeating sequence of "select : Invalid
argument (code=22)"

2004.04.11 -- Version 2.0-test22

* Fixed bug where --mode server + --daemon was
prematurely closing syslog connection.
* Added support for --redirect-gateway on Mac OS X
(Jeremy Apple).
* Minor changes to TAP-Win32 driver based on feedback
from the NDISTest tool.

2004.04.11 -- Version 2.0-test21

* Optimizations in multi-client server event loop.

2004.04.10 -- Version 2.0-test20

* --mode server capability now works with either tun
or tap interfaces. When used with tap interfaces,
OpenVPN will internally bridge all client tap
interfaces with the server tap interface.
* Connecting clients can now have a client-specific
configuration on the server, based on the client
common name embedded in the client certificate.
See --client-config-dir and --client-connect.
These options can be used to configure client-specific
* Added an option --client-to-client that enables
internal client-to-client routing or bridging.
Otherwise, clients will only "see" the server,
not other connected clients.
* Fixed bug in route scheduling which would have caused
--mode server to not work on Windows in test18
and test19 with the sample config file.
* Man page is up to date with all new options.
* OpenVPN 2.0 release notes on web site updated
with tap-style tunnel examples.

2004.04.02 -- Version 2.0-test19

* Fixed bug where routes pushed from server were
not working correctly on Windows clients.
* Added Mac OS X route patch (Jeremy Apple).

2004.03.30 -- Version 2.0-test18

* Minor fixes + Windows self-install modified
to use OpenSSL 0.9.7d.

2004.03.29 -- Version 2.0-test17

* Fixed some bugs related to instance timeout and deletion.
* Extended --push/--pull option to support additional
option classes.

2004.03.28 -- Version 2.0-test16

* Successful test of --mode udp-server, --push,
--pull, and --ifconfig-pool with server on
Linux 2.4 and clients on Linux and Windows.

2004.03.25 -- Version 2.0-test15

* Implemented hash-table lookup of client instances
based either on remote UDP address/port or remote
ifconfig endpoint.
* Implemented a randomized binary tree based
scheduler for scalably scheduling a large number
of client instance events. Uses the treap
data structure and node rotation algorithm
to keep the tree balanced.
* Initial implementation of ifconfig-pool.
* Made --key-method 2 the default.

2004.03.20 -- Version 2.0-test14

* Implemented --push and --pull.

2004.03.20 -- Version 2.0-test13

* Reduced struct tls_multi and --single-session
memory footprint.
* Modified --single-session flag to be used
in multi-client UDP server client instances.

2004.03.19 -- Version 2.0-test12

* Added the key multi-client UDP server options,
--mode, --push, --pull, and --ifconfig-pool.
* Revamped GC (garbage collection) code to not rely
on any global data.
* Modifications to thread.[ch] to allow a more
flexible thread model.

2004.03.16 -- Version 2.0-test11

* Moved all timer code to interval.h, added new file
* Fixed missing include.

2004.03.16 -- Version 2.0-test10

* More TAP-Win32 fixes.
* Initial debugging and testing of multi.[ch].

2004.03.14 -- Version 2.0-test9

* Branch merge with 1.6-rc3
* More point-to-multipoint work in multi.[ch].
* Major TAP-Win32 driver restructuring to use
NdisMRegisterDevice instead of
* Changed TAP-Win32 symbolic links to use \DosDevices\Global\
pathname prefix.
* In the majority of cases, TAP-Win32 should now be
able to install and uninstall on Win2K without requiring
a reboot.
* TAP-Win32 MAC address can now be explicitly set in the
adapter advanced properties page.

2004.03.04 -- Version 2.0-test8

* Branch merge with 1.6-rc2.

2004.03.03 -- Version 2.0-test7

* Branch merge with 1.6-rc1.2.

2004.03.02 -- Version 2.0-test6

* Branch merge with 1.6-rc1.

2004.03.02 -- Version 2.0-test5

* Move Socks5 UDP header append/remove to socks.c, and is
called from forward.c.
* Moved verify statics from ssl.c into struct tls_session.
* Wrote multi.[ch] to handle top level of point-to-multipoint
* Wrote some code to allow a struct link_socket in a child context
to be slaved to the parent context.
* Broke up packet read and process functions in forward.c
(from socket or tuntap) into separate functions for read
and process, so that point-to-point and point-to-multipoint can
share the same code.
* Expand TLS control channel to allow the passing of configuration
* Wrote mroute.[ch] to handle internal packet routing for
point-to-multipoint mode.

2004.02.22 -- Version 2.0-test3

* Initial work on UDP multi-client server.
* Branch merge of 1.6-beta7

2004.02.14 -- Version 2.0-test2

* Refactorization of openvpn.c into openvpn.[ch]
init.[ch] forward.[ch] forward-inline.h
occ.[ch] occ-inline.h ping.[ch] ping-inline.h
sig.[ch]. Created a master per-tunnel
struct context in openvpn.h.
* Branch merge of 1.6-beta6.2

2003.11.06 -- Version 2.0-test1

* Initial testbed for 2.0.

2004.05.09 -- Version 1.6.0

* Unchanged from 1.6-rc4 except for version number

2004.04.01 -- Version 1.6-rc4

* Made minor customizations to devcon and
renamed as tapinstall.exe for Windows version.
* Fixed "storage size of `iv' isn't known" build
problem on FreeBSD.
* OpenSSL 0.9.7d bundled with Windows self-install.

2004.03.13 -- Version 1.6-rc3

* Minor Windows fixes for --ip-win32 dynamic, relating to
the way the TAP-Win32 driver responds to a DHCP request
from the Windows DHCP client.
* The net_gateway environmental variable wasn't being
set correctly for called scripts (Paul Zuber).
* Added code to determine the default gateway on FreeBSD,
allowing the --redirect-gateway option to work
(Juan Rodriguez Hervella).

2004.03.04 -- Version 1.6-rc2

* Fixed bug in Windows version where the NetBIOS node-type
DHCP option might have been passed even if it was not
* Fixed bug in Windows version introduced in 1.6-rc1, where
DHCP timeout would be set to 0 seconds if --ifconfig option
was used and --ip-win32 option was not explicitly specified.
* Added some new --dhcp-option types for Windows version.

2004.03.02 -- Version 1.6-rc1

* For Windows, make "--ip-win32 dynamic" the default.
* For Windows, make "--route-delay 10" the default
unless --ip-win32 dynamic is not used or --route-delay
is explicitly specified.
* L_TLS mutex could have been left in a locked state
for certain kinds of TLS errors.

2004.02.22 -- Version 1.6-beta7

* Allow scheduling priority increase (--nice) together
with UID/GID downgrade (--user/--group).
* Code that causes SIGUSR1 restart on TLS errors in TCP
mode was not activated in pthread builds.
* Save the certificate serial number in an environmental
variable called tls_serial_{n} prior to calling the
--tls-verify script. n is the current cert chain level.
* Added NetBSD IPv6 tunnel capability (also requires
a kernel patch) (Horst Laschinsky).
* Fixed bug in checking the return value of the nice()
function (Ian Pilcher).
* Bug fix in new FreeBSD IPv6 over TUN code which was
originally added in 1.6-beta5 (Nathanael Rensen).
* More Socks5 fixes -- extended the struct frame
infrastructure to accomodate proxy-based encapsulation
* Added --dhcp-option to Windows version for setting
adapter properties such as WINS & DNS servers.
* Use a default route-delay of 5 seconds when
--ip-win32 dynamic is specified (only applicable when
--route-delay is not explicitly specified).
* Added "log_append" registry variable to control
whether the OpenVPN service wrapper on Windows
opens log files in append (log_append="1") or
truncate (log_append="0") mode. The default
is truncate.

2004.02.05 -- Version 1.6-beta6

* UDP over Socks5 fix to accomodate Socks5 encapsulation
overhead (Christof Meerwald).
* Minor --ip-win32 dynamic tweaks (use long lease time,
invalidate existing lease with DHCPNAK).

2004.02.01 -- Version 1.6-beta5

* Added Socks5 proxy support (Christof Meerwald).
* IPv6 tun support for FreeBSD (Thomas Glanzmann).
* Special TAP-Win32 debug mode for Windows self-install that was
enabled in beta4 is now turned off.
* Added some new Solaris notes to INSTALL (Koen Maris).
* More work on --ip-win32 dynamic.

2004.01.27 -- Version 1.6-beta4

* For this beta, the Windows self-install is a debug version
and will run slower -- use only for testing.
* Reverted the --ip-win32 default back to 'ipapi'
from 'dynamic'.
* Added the offset parameter to '--ip-win32 dynamic' which
can be used to control the address of the masqueraded
DHCP server which replies to Windows DHCP requests.
* Added a wait/nowait option to --inetd (nowait can only
be used with TCP sockets, TLS authentication, and over
a bridged configuration -- see FAQ for more info)
(Stefan `Sec` Zehl).
* Added a build-time capability where TAP-Win32 driver
debug messages can be output by OpenVPN at --verb 6
or higher.

2004.01.20 -- Version 1.6-beta2

* Added ./configure --enable-iproute2 flag which
uses iproute2 instead of route + ifconfig --
this is necessary for the LEAF Linux distro
(Martin Hejl).
* Added renewal-time and rebind-time to set of
DHCP options returned by the TAP-Win32 driver when
"--ip-win32 dynamic" is used.

2004.01.14 -- Version 1.6-beta1

* Fixed --proxy bug that sometimes caused plaintext
control info generated by the proxy prior to http
CONNECT method establishment to be incorrectly
parsed as OpenVPN data.
* For Windows version, implemented the
"--ip-win32 dynamic" method and made it the default.
This method sets the TAP-Win32 adapter IP address
and netmask by replying to the kernel's DHCP queries.
See the man page for more detailed info.
* Added --connect-retry parameter which controls
the time interval (in seconds) between connect()
retries when --proto tcp-client is used. Previously,
this value was hardcoded to 5 seconds, and still
defaults as such.
* --resolv-retry can now be used with a parameter
of "infinite" to retry indefinitely.
* Added SSL_CTX_use_certificate_chain_file() to ssl.c
for support of multi-level certificate chains
(Sten Kalenda).
* Fixed --tls-auth incompatibility with 1.4.x and earlier
versions of OpenVPN when the passphrase file is an
OpenVPN static key file (as generated by --genkey).
* Added shell-escape support in config files using
the backslash character ("\") so that (for example)
double quotes can be passed to the shell.
* Added "contrib" subdirectory on tarball, source zip,
and CVS containing user-submitted contributions.
* Added an optional patch to the Redhat init script to
allow the configuration file directory to be a
multi-level directory hierarchy (Farkas Levente).
See contrib/multilevel-init.patch
* Added some scripts and documentation on using
Linux "fwmark" iptables rules to enable
fine-grained routing control over the VPN
(Sean Reifschneider, ).
See contrib/openvpn-fwmarkroute-1.00

2003.11.20 -- Version 1.5.0

* Minor documentation changes.

2003.11.04 -- Version 1.5-beta14

* Fixed build problem with ./configure --disable-ssl
that was reported on Debian woody.
* Fixed bug where --redirect-gateway could not be used
together with --resolv-retry.

2003.11.03 -- Version 1.5-beta13

* Added CRL (certificate revocation list) capability using
--crl-verify option (Stefano Bracalenti).
* Added --replay-window option for variable replay-protection
window sizes.
* Fixed --fragment bug which might have caused certain large
packets to be sent unfragmented.
* Modified --secret and --tls-auth to permit different cipher and
HMAC keys to be used for each data flow direction. Also
increased static key file size generated by --genkey from
1024 to 2048 bits, where 512 bits each are reserved for
send-HMAC, encrypt, receive-HMAC, and decrypt. Key file forward
and backward compatibility is maintained. See --secret option
documentation on the man page for more info.
* Added --tls-remote option (Teemu Kiviniemi).
* Fixed --tls-cipher documention regarding correct delimiter
usage (Teemu Kiviniemi).
* Added --key-method option for selecting alternative data
channel key negotiation methods. Method 1 is the default.
Method 2 has been added (see man page for more info).
* Added French translation of HOWTO to web site
(Guillaume Lehmann).
* Fixed problem caused by late resolver library load on
certain platforms when --resolv-retry and --chroot are
used together (Teemu Kiviniemi).
* In TCP mode, all decryption or TLS errors will abort the current
connection (this is not done in UDP mode because UDP is
* Fixed a TCP client reconnect bug that only occurs on the
BSDs, where connect() fails with an invalid argument. This
bug was partially (but not completely) fixed in beta7.
* Added "route_net_gateway" environmental variable which contains
the pre-existing default gateway address from the routing table
(there's no standard API for getting the default gateway, so
right now this feature only works on Windows or Linux).
* Renamed the "route_default_gateway" enviromental variable to
"route_vpn_gateway" -- this is the remote VPN endpoint.
* The special keywords vpn_gateway, net_gateway, and remote_host
can now be used for the network or gateway components of the
--route option. See the man page for more info.
* Added the --redirect-gateway option to configure the VPN
as the default gateway (implemented on Linux and Windows only).
* Added the --http-proxy option with basic authentication
support for use in TCP client mode. Successfully tested
using Squid as the HTTP proxy, with and without authentication.

2003.10.12 -- Version 1.5-beta12

* Fixed Linux-only bug in --mktun and --rmtun which was
introduced around beta8 or so, which would cause
an error such as "I don't recognize device tun0 as a
tun or tap device1".
* Added --ifconfig-nowarn option to disable options
consistency warnings about --ifconfig parameters.
* Don't allow any kind of sequence number backtracking or
message reordering when in TCP mode.
* Changed beta naming convention to use '_' (underscore)
rather than '-' (dash) to pacify rpmbuild.

2003.10.08 -- Version 1.5-beta11

* Modified code in the Windows version which sets the IP address
and netmask of the TAP-Win32 adapter using the IP Helper API.
Most of the changes involve better error recovery when
the IP Helper API returns an error status. See the
manual page entry on --ip-win32 for more info.

2003.10.08 -- Version 1.5-beta10

* Added getpass() function for Windows version so that --askpass
option works correctly (Stefano Bracalenti).
* Added reboot advisory to end of Win32 install script.
* Changed crypto code to use pseudo-random IVs rather than
carrying forward the IV state from the previous packet.
This is in response to item 2 in the following document: which points
out weaknesses in TLS's use of the same IV carryforward
approach. This change does not break protocol compatibility
with previous versions of OpenVPN.
* Made a change to the crypto replay protection code to also
protect against certain kinds of packet reordering attacks.
This change does not break protocol compatibility with
previous versions of OpenVPN.
* Added --ip-win32 option to provide several choices for
setting the IP address on the TAP-Win32 adapter.
* #ifdefed out non-CBC crypto modes by default.
* Added --up-delay option to delay TUN/TAP open and --up script
execution until after connection establishment. This option
replaces the earlier windows-only option --tap-delay.

2003.10.01 -- Version 1.5-beta9

* Fixed --route-noexec bug where option was not parsed correctly.
* Complain if --dev tun is specified without --ifconfig on Windows.
* Fixed bug where TCP connections on windows would sometimes cause
an assertion failure.
* Added a new flag to TAP-Win32 advanced properties that allows one
to set the adapter to be always "connected" even when an OpenVPN
process doesn't have it open. The default behavior is to report
a media status of connected only when an OpenVPN process has the
adapter open.
* Rebuilt the Windows self-install distribution with OpenSSL 0.9.7c
DLLs in response to an OpenSSL security advisory.

2003.09.30 -- Version 1.5-beta8

* Extended the --ifconfig option to work on tap devices as well
as tun devices.
* Implemented the --ifconfig option for Windows, by calling the
netsh tool.
* By default, do an "arp -d *" on Windows after TAP-Win32 open to
refresh the MAC cache. This behaviour can be disabled with
* On Windows, allow the --dev-node parameter (which specifies
the name of the TAP-Win32 adapter) to be omitted in cases where
there is a single TAP-Win32 adapter on the system which can be
assumed to be the default.
* Modified the diagnostic --verb 5 debugging level to print 'R'
for TCP/UDP read, 'W' for TCP/UDP write, 'r' for TUN/TAP read,
and 'w' for TUN/TAP write.
* Conditionalize OpenBSD read_tun and write_tun based on tun or tap
* Added IPv6 tun support to OpenBSD (Thomas Glanzmann).
* Make the --enable-mtu-dynamic ./configure option enabled by
* Deprecated the --mtu-dynamic run-time option, in favor of
* DNS names can now be used as --ifconfig parameters.
* Significant work on TAP-Win32 driver to bring up to SMP standards.
* On Windows, fixed dangling IRP problem if TAP-Win32 driver is
unloaded or disabled, while a user-space process has it open.
* On Windows, if --tun-mtu is not specified, it will be read from
the TAP-Win32 driver via ioctl.
* On Windows, added TAP-Win32 driver status info to "F2" keyboard
signal (only when run from a console window).
* Added --mssfix option to control TCP MSS size (YANO Hirokuni).
* Renamed --mtu-dynamic option to --fragment to more accurately
reflect its function. Fragment accepts a single parameter which
is the upper limit on acceptable UDP packet size.
* Changed default --tun-mtu-extra parameter to 32 from 64.
* Eliminated reference to malloc.o in
* Added tun device emulation to the TAP-Win32 driver.
* Added --route and related options.
* Added init script for SuSE Linux (Frank Plohmann).
* Extended option consistency check between peers to function
in all crypto modes, including static-key and cleartext modes.
Previously only TLS mode was supported. Disable with
* Overall, increased the amount of configuration option sanity
checking, especially of networking parameters.
* Added --mtu-test option for empirical MTU measurement.
* Added Windows-only option --tap-delay to not set the TAP-Win32
adapter media state to 'connected' until TCP/UDP connection
establishment with peer.
* Slightly modified --route/--route-delay semantics so that when
--route is given without --route-delay, routes are added
immediately after tun/tap device open. When --route-delay is
specified, routes will be added n seconds after connection
initiation, where n is the --route-delay parameter (which
can be set to 0).
* Made TCP framing error into a non-fatal error that triggers a
connection reset.

2003.08.28 -- Version 1.5-beta7

* Fixed bug that caused OpenVPN not to respond to exit/restart
signals when --resolv-retry is used and a local or remote DNS
name cannot be resolved.
* Exported a series of environmental variables with useful
info for scripts. See man page for more info. Based
on a suggestion by Anthony Ciaravalo.
* Moved TCP/UDP socket bind to a point in the initialization
before the --up script gets called. This is desirable
because (a) a socket bind failure will happen before
daemonization, allowing an error status code to be returned
to the shell and (b) the possibility is eliminated of a
socket bind failure causing the --up script to be run
but not the --down script. This change has a side effect
that --resolv-retry will no longer work with --local.
* Fixed bug where if an OpenVPN TCP server went down and back
up again, Solaris or FreeBSD clients would fail to reconnect
to it.
* Fixed bug that prevented OpenVPN from being run by
inetd/xinetd in TCP mode.
* Added --log and --log-append options for logging messages to
a file.
* On Windows, check that the current user is a member of the
Administrator group before attempting install or uninstall.

2003.08.16 -- Version 1.5-beta6

* Fixed TAP-Win32 driver to properly increment the Rx/Tx count.

2003.08.14 -- Version 1.5-beta5

* Added user-configurability of the TAP-Win32 adapter MTU
through the adapter advanced properties page.
* Added Windows Service support.
* On Windows, added file association and right-clickability
for .ovpn files (OpenVPN config files).

2003.08.05 -- Version 1.5-beta4

* Extra refinements and error checking added to Windows
NSIS install script.

2003.08.05 -- Version 1.5-beta3

* Added md5.h include to crypto.c to fix build problem on
* Created a Win32 installer using NSIS.
* Removed DelService command from TAP-Win32 INF file. It appears
to be not necessary and it interfered with the ability to
uninstall and reinstall the driver without needing to reboot.
* On Windows version, added "addtap" and "deltapall" batch
files to add and delete TAP-Win32 adapter instances.

2003.07.31 -- Version 1.5-beta2

* Renamed INSTALL.w32 to INSTALL-win32.txt and reformatted
in Windows ASCII so it's easier to click and view.
* Added postscript and PDF versions of the HOWTO to the web
site (C R Zamana).
* Merged Michael Clarke's stability patch into TAP-Win32
driver which appears to fix the suspend/resume driver bug
and significantly improve driver stability.
* Added Christof Meerwald's Media Status patch to the
TAP-Win32 driver which shows the TAP adapter to be
disconnected when OpenVPN is not running.
* Moved socket connect and TCP server listen code to a later
point in openvpn() function so that the TCP server listen
state is entered after daemonization.
* Added keyboard shortcuts to simulate signals in the Windows
version, see the window title bar for descriptions.

2003.07.24 -- Version 1.5-beta1

* Added TCP support via the new --proto option.
* Renamed udp-centric options such as --udp-mtu to
--link-mtu (old option names preserved for compatibility).
* Ported to Windows 2000 + XP using mingw and a TAP driver
derived from the Cipe-Win32 project by Damion K. Wilson.
* Added --show-adapters flag for windows version.
* Reworked the SSL/TLS packet acknowledge code to better
handle certain corner cases.
* Turned off the default enabling of IP forwarding in the
sample-scripts/openvpn.init script for Redhat.
Forwarding can be enabled by users in their --up scripts
or firewall config.
* Added --up-restart option based on suggestion from Sean
* If --dev tap or --dev-type tap is specified, --tun-mtu
defaults to 1500 and --tun-mtu-extra defaults to 64.
* Enabled --verb 5 debugging mode that prints 'R' and 'W'
for each packet read or write on the TCP/UDP socket.

2003.08.04 -- Version 1.4.3

* Added md5.h include to crypto.c
to fix build problem on OpenBSD.

2003.07.15 -- Version 1.4.2

* Removed adaptive bandwidth from
--mtu-dynamic -- its absence appears
to work better than its existence (
* Minor changes to --shaper to fix long
retransmit timeouts at low bandwidth
* Added LOG_RW flag to openvpn.h for
debugging (
* Silenced spurious configure warnings (
* Backed out --dev-name patch, modified --dev
to offer equivalent functionality (
* Added an optional parameter to --daemon and
--inetd to support the passing of a custom
program name to the system logger (
* Add compiled-in options to the program title
* Coded the beginnings of a WIN32 port (
* Succeeded in porting to Win32 Mingw environment
and running loopback tests ( Still
need a kernel driver for full Win32
* Fixed a bug in error.h where
This would have caused a significant slowdown
of OpenVPN when built by compilers that
lack ISO C99 vararg macros (
* Created an init script for Gentoo Linux
in ./gentoo directory (

2003.05.15 -- Version 1.4.1

* Modified the Linux 2.4 TUN/TAP open code to
fall back to the 2.2 TUN/TAP interface if the
open or ioctl fails.
* Fixed bug when --verb is set to 0 and non-fatal
socket errors occur, causing 100% CPU utilization.
Occurs on platorms where
such as Linux 2.4.
* Fixed typo in tun.c that was preventing
OpenBSD build.
* Added --enable-mtu-dynamic configure option
to enable --mtu-dynamic experimental option.

2003.05.07 -- Version 1.4.0

* Added --replay-persist feature to allow replay
protection across sessions.
* Fixed bug where --ifconfig could not be used
with --tun-mtu.
* Added --tun-mtu-extra parameter to deal with
the situation where a read on a TUN/TAP device
returns more data than the device's MTU size.
* Fixed bug where some IPv6 support code for
Linux was not being properly ifdefed out for
Linux 2.2, causing compile errors.
* Added OPENVPN_EXIT_STATUS_x codes to
openvpn.h to control which status value
openvpn returns to its caller (such as
a shell or inetd/xinetd) for various conditions.
openvpn.h to allow debugging in situations
where stdout, stderr, and syslog cannot be used
for message output, such as when OpenVPN is
instantiated by inetd/xinetd.
* Removed owner-execute permission from file
created by static key generator (Herbert Xu
and Alberto Gonzalez Iniesta).
* Added --passtos option to allow IPv4 TOS bits
to be passed from TUN/TAP input packets to
the outgoing UDP socket (Craig Knox).
* Added code to prevent open socket file descriptors
from being accessible to called scripts.
* Added --dev-name option (Christian Lademann).
* Added --mtu-disc option for manual control
over MTU options.
* Show OS MTU value on UDP socket write failures
(linux only).
* Numerous build system and portability
fixes (Matthias Andree).
* Added better sensing of compiler support for
variable argument macros, including (a) gcc
style, (b) ISO C 1999 style, and (c) no support.
* Removed generated files from CVS. Note INSTALL
file for new CVS build commands.
* Changed certain internal symbol names
for C standards compliance.
* Added TUN/TAP open code to cycle dynamically
through unit numbers until it finds a free
unit (based on code from Thomas Gielfeldt
and VTun).
* Added dynamic MTU and fragmenting infrastructure
(Experimental). Rebuild with FRAGMENT_ENABLE
defined to enable.
* Minor changes to SSL/TLS negotiation, use
exponential backoff on retransmits, and use
a smaller MTU size (note that no protocol
changes have been made which would break
compatibility with 1.3.x).
* Added --enable-strict-options flag
to ./configure. This option will cause
a more strict check for options compatibility
between peers when SSL/TLS negotiation is used,
but should only be used when both OpenVPN peers
are of the same version.
* Reorganization of debugging levels.
* Added a workaround in for
default SSL header location on Linux
to fix RH9 build problem.
* Fixed potential deadlock when pthread support
is used on OSes that allocate a small socketpair()
message buffer.
* Fixed openvpn.init to be sh compliant
(Bishop Clark).
* Changed --daemon to wait until all
initialization is finished before becoming a
daemon, for the benefit of initialization
scripts that want a useful return status from
the openvpn command.
* Made openvpn.init script more robust, including
positive indication of initialization errors
in the openvpn daemon and better sanity checks.
* Changed --chroot to wait until initialization
is finished before calling chroot(), and allow
the use of --user and --group with --chroot.
* When syslog logging is enabled (--daemon or
--inetd), set stdin/stdout/stderr to point
to /dev/null.
* For inetd instantiations, dup socket descriptor
to a >2 value.
* Fixed bug in verify-cn script, where test would
incorrectly fail if CN=x was the last component
of the X509 composite string (Anonymous).
* Added Markus F.X.J. Oberhumer's special
license exception to COPYING.

2002.10.23 -- Version 1.3.2

* Added SSL_CTX_set_client_CA_list call
to follow the canonical form for TLS initialization
recommended by the OpenSSL docs. This change allows
better support for intermediate CAs and has no impact
on security.
* Added build-inter script to easy-rsa package, to
facilitate the generation of intermediate CAs.
* Ported to NetBSD (Dimitri Goldin).
* Fixed minor bug in easy-rsa/sign-req. It refers to
openssl.cnf file, instead of $KEY_CONFIG, like all
other scripts (Ernesto Baschny).
* Added --days 3650 to the root CA generation command
in the HOWTO to override the woefully small 30 day
default (Dominik 'Aeneas' Schnitzer).
* Fixed bug where --ping-restart would sometimes
not re-resolve remote DNS hostname.
* Added --tun-ipv6 option and related infrastructure
support for IPv6 over tun.
* Added IPv6 over tun support for Linux (Aaron Sethman).
* Added FreeBSD 4.1.1+ TUN/TAP driver notes to
INSTALL (Matthias Andree).
* Added inetd/xinetd support (--inetd) including
documentation in the HOWTO.
* Added "Important Note on the use of commercial certificate
authorities (CAs) with OpenVPN" to HOWTO based on
issues raised on the openvpn-users list.

2002.07.10 -- Version 1.3.1

* Fixed bug in openvpn.spec and openvpn.init
which caused RPM upgrade to fail.

2002.07.10 -- Version 1.3.0

* Added --dev-node option to allow explicit selection of
tun/tap device node.
* Removed mlockall call from child thread, as it doesn't
appear to be necessary (child thread inherits mlockall
state from parent).
* Added --ping-timer-rem which causes timer for --ping-exit
and --ping-restart not to run unless we have a remote IP
* Added condrestart to openvpn.init and openvpn.spec
(Bishop Clark).
* Added --ifconfig case for FreeBSD (Matthias Andree).
* Call openlog with facility=LOG_DAEMON (Matthias Andree).
* Changed LOG_INFO messages to LOG_NOTICE.
* Added warning when key files are group/others accessible.
* Added --single-session flag for TLS mode.
* Fixed bug where --writepid would segfault if used with
an invalid filename.
* Fixed bug where --ipchange status message was formatted
* Print more concise error message when system() call
* Added --disable-occ option.
* Added --local, --remote, and --ifconfig options sanity
* Changed default UDP MTU to 1300 and TUN/TAP MTU to
* Successfully tested with OpenSSL 0.9.7 Beta 2.
* Broke out debug level definitions to errlevel.h
* Minor documentation and web site changes.
* All changes maintain protocol compatibility
with OpenVPN versions since 1.1.0, however default
MTU changes will require setting the MTU explicitly
by command line option, if you want 1.3.0 to
communicate with previous versions.

2002.06.12 -- Version 1.2.1

* Added --ping-restart option to restart
connection on ping timeout using SIGUSR1
logic (Matthias Andree).
* Added --persist-tun, --persist-key,
--persist-local-ip, and --persist-remote-ip
options for finer-grained control over SIGUSR1
and --ping-restart restarts. To
replicate previous SIGUSR1 functionality,
use --persist-remote-ip.
* Changed residual IV fetching code to take
IV from tail of ciphertext.
* Added check to make sure that CFB or OFB
cipher modes are only used with SSL/TLS
authentication mode, and added a caveat
* Changed signal handling during initialization
(including re-initialization during restarts)
to exit on SIGTERM or SIGINT and ignore other
signals which would ordinarily be caught.
* Added --resolv-retry option to allow
retries on hostname resolution.
* Expanded the --float option to also
allow dynamic changes in source port number
on incoming datagrams.
* Added --mute option to limit repetitive
logging of similar message types.
* Added --group option to downgrade GID
after initialization.
* Try to set ifconfig path automatically
in configure.
* Added --ifconfig code for Mac OS X
(Christoph Pfisterer).
* Moved "Peer Connection Initiated" message
to --verb level 1.
* Successfully tested with
OpenSSL 0.9.7 Beta 1 and AES cipher.
* Added RPM notes to INSTALL.
* Added ACX_PTHREAD (from the autoconf
macro archive) to
to figure out the right pthread
options for a given platform.
* Broke out macro definitions from to acinclude.m4.
* Minor changes to docs and HOWTO.
* All changes maintain protocol compatibility
with OpenVPN versions since 1.1.0.

2002.05.22 -- Version 1.2.0

* Added configuration file support via
the --config option.
* Added pthread support to improve latency.
With pthread support, OpenVPN
will offload CPU-intensive tasks such as RSA
key number crunching to a background thread
to improve tunnel packet forwarding
latency. pthread support can be enabled
with the --enable-pthread configure option.
Pthread support is currently available
only for Linux and Solaris.
* Added --dev-type option so that tun/tap
device names don't need to begin with
"tun" or "tap".
* Added --writepid option to write main
process ID to a file.
* Numerous portability fixes to ease
porting to other OSes including changing
all network types to uint8_t and uint32_t,
and not assuming that time_t is 32 bits.
* Backported to OpenSSL 0.9.5.
* Ported to Solaris.
* Finished OpenBSD port except for
pthread support.
* Added initialization script:
(Douglas Keller)
* Ported to Mac OS X (Christoph Pfisterer).
* Improved resilience to DoS attacks when
TLS mode is used without --remote or
--tls-auth, or when --float is used
with --remote. Note however that the best
defense against DoS attacks in TLS mode
is to use --tls-auth.
* Eliminated automake/autoconf dependency
for non-developers.
* Ported to
and autoconf 2.50+.
* SIGHUP signal now causes OpenVPN to restart
and re-read command line and or config file,
in conformance with canonical daemon behaviour.
* SIGUSR1 now does what SIGHUP did in
version 1.1.1 and earlier -- close and reopen
the UDP socket for use when DHCP changes
host's IP address and preserve most recently
authenticated peer address without rereading
config file.
* SIGUSR2 added -- outputs current statistics,
including compression statistics.
* All changes maintain protocol compatibility
with 1.1.1 and 1.1.0.

2002.04.22 -- Version 1.1.1

* Added --ifconfig option to automatically configure
TUN device.
* Added inactivity disconnect (--inactive
and --ping-exit options).
* Added --ping option to keep stateful firewalls
from timing out.
* Added sanity check to command line parser to
err if any TLS options are used in non-TLS mode.
* Fixed build problem with compiler environments that
define printf as a macro.
* Fixed build problem on linux systems that have
an integrated TUN/TAP driver but lack the persistent
tunnel feature (TUNSETPERSIST). Some linux kernels
>= 2.4.0 and < 2.4.7 fall into this category.
* Changed all calls to EVP_CipherInit to use explicit
encrypt/decrypt mode in order to fix problem with
IDEA-CBC and AES-256-CBC ciphers.
* Minor changes to control channel transmit limiter
algorithm to fix problem where TLS control channel
might not renegotiate within the default 60 second window.
* Simplified man page examples by taking advantage
of the new --ifconfig option.
* Minor changes to to check more
rigourously for OpenSSL 0.9.6 or greater.
* Put back openvpn.spec, eliminated
* Modified openvpn.spec to reflect new automake-based
build environment (Bishop Clark).
* Other documentation changes.
* Added --test-crypto option for debugging.
* Added "missing" and "mkinstalldirs" automake
support files.

2002.04.09 -- Version 1.1.0

* Strengthened replay protection and IV handling,
extending it fully to both static key and
TLS dynamic key exchange modes.
* Added --mlock option to disable paging and ensure that key
material and tunnel data is never paged to disk.
* Added optional traffic shaping feature to cap the maximum
data rate of the tunnel.
* Converted to automake (The Platypus Brothers 2002-04-01).
* Ported to OpenBSD by Janne Johansson.
* Added --tun-af-inet option to work around an incompatibility
between Linux and BSD tun drivers.
* Sequence number-based replay protection using the
IPSec sliding window model is now the default,
disable with --no-replay.
* Explicit IV is now the default, disable with --no-iv.
* Disabled all cipher modes except CBC, CFB, and OFB.
* In CBC mode, use explicit IV and carry forward residuals,
using IPSec model.
* In CFB/OFB mode, IV is timestamp, sequence number.
* Eliminated --packet-id, --timestamp, and max-delta parameter to
the --tls-auth option as they are now supplanted by improved
replay code which is enabled by default.
* Eliminated --rand-iv as it is now obsolete with improved
IV code.
* Eliminated --reneg-err option as it increases vulnerability
to DoS attacks.
* Added weak key check for DES ciphers.
* --tls-freq option is no longer specified on the command line,
instead it now inherits its parameter from the
--tls-timeout option.
* Fixed bug that would try to free memory on exit that was
never malloced if --comp-lzo was not specified.
* Errata fixed in the man page examples: "test-ca" should be
* Updated manual page.
* Preliminary work in porting to OpenSSL 0.9.7.
* Changed license to allowing linking with OpenSSL.

2002.03.29 -- Version 1.0.3

* Fixed a problem in configure with library ordering on the
command line.

2002.03.28 -- Version 1.0.2

* Improved the efficiency of the inner event loop.
* Fixed a minor bug with timeout handling.
* Improved the build system to build on RH 6.2 through 7.2.
* Added an openvpn.spec file for RPM builders (Bishop Clark).

2002.03.23 -- Version 1.0

* Added TLS-based authentication and key exchange.
* Added gremlin mode to stress test.
* Wrote man page.

2001.12.26 -- Version 0.91

* Added any choice of cipher or HMAC digest.

2001.5.13 -- Version 0.90

* Initial release.
* IP tunnel over UDP, with blowfish cipher and SHA1 HMAC signature.