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[Openvpn-users] OpenVPN 1.5-beta11 is out, need feedback on --ip-win32


  • Subject: [Openvpn-users] OpenVPN 1.5-beta11 is out, need feedback on --ip-win32
  • From: "James Yonan" <jim@xxxxxxxxx>
  • Date: Fri, 10 Oct 2003 13:36:58 -0000

The latest few versions of OpenVPN try to implement the --ifconfig options on
Windows, just like it works on Linux and and every other platform.

--ifconfig basically tells OpenVPN to set the TCP/IP properties (i.e. network
and subnet mask) on the TAP adapter programmatically.

The problem is that while Windows has quite a number of different ways to do
this, each method seems to work great on one version of Windows while breaking
down completely on another.  The latest version of OpenVPN has an option
--ip-win32 which lets you choose one of three methods for setting the IP
address.  The newest method is "ipapi" which uses the Windows "IP helper API".

I would like to get some feedback on the "ipapi" method, specifically cases
where it does and doesn't work.

A few pointers on ipapi:

* It's best to use it on TAP-Win32 adapters in their original state, with no
fixed IP or netmask, and "Obtain an IP Address Automatically" checked.

* If you get an error, (a) try disabling and renabling the driver in the
network control panel, or (b) try adding a "tap-sleep 15" option which will
cause OpenVPN to sleep for 15 seconds after it opens the TAP adapter to give
it time to get connected.

James


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