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Re: [Openvpn-users] Configuration problems


  • Subject: Re: [Openvpn-users] Configuration problems
  • From: Koen Vermeer <koen@xxxxxxxxxx>
  • Date: Tue, 18 Dec 2007 09:59:37 +0100

Hi Jan Just,

Thanks for the reply. Unfortunately, it didn't seem to solve my problem;
routing probably still doesn't work. I've got the results of 'route
print' before and after connecting. Apologies for the layout... Before:

Active Routes:
Network Destination        Netmask          Gateway       Interface
Metric
          0.0.0.0          0.0.0.0      192.168.1.1    192.168.1.27
1
        127.0.0.0        255.0.0.0        127.0.0.1       127.0.0.1
1
      192.168.1.0    255.255.255.0     192.168.1.27    192.168.1.27
10
     192.168.1.27  255.255.255.255        127.0.0.1       127.0.0.1
10
    192.168.1.255  255.255.255.255     192.168.1.27    192.168.1.27
10
        224.0.0.0        240.0.0.0     192.168.1.27    192.168.1.27
10
  255.255.255.255  255.255.255.255     192.168.1.27    192.168.1.27
1
  255.255.255.255  255.255.255.255     192.168.1.27               3
1
Default Gateway:       192.168.1.1

After:

Active Routes:
Network Destination        Netmask          Gateway       Interface
Metric
          0.0.0.0        128.0.0.0    172.17.145.20   172.17.145.70
1
          0.0.0.0          0.0.0.0      192.168.1.1    192.168.1.27
1
    65.55.200.221  255.255.255.255      192.168.1.1    192.168.1.27
1
        127.0.0.0        255.0.0.0        127.0.0.1       127.0.0.1
1
        128.0.0.0        128.0.0.0    172.17.145.20   172.17.145.70
1
     172.17.145.0    255.255.255.0    172.17.145.70   172.17.145.70
30
    172.17.145.70  255.255.255.255        127.0.0.1       127.0.0.1
30
   172.17.255.255  255.255.255.255    172.17.145.70   172.17.145.70
30
    192.87.167.62  255.255.255.255      192.168.1.1    192.168.1.27
1
      192.168.1.0    255.255.255.0     192.168.1.27    192.168.1.27
10
     192.168.1.27  255.255.255.255        127.0.0.1       127.0.0.1
10
    192.168.1.255  255.255.255.255     192.168.1.27    192.168.1.27
10
        224.0.0.0        240.0.0.0    172.17.145.70   172.17.145.70
30
        224.0.0.0        240.0.0.0     192.168.1.27    192.168.1.27
10
  255.255.255.255  255.255.255.255    172.17.145.70   172.17.145.70
1
  255.255.255.255  255.255.255.255     192.168.1.27    192.168.1.27
1
Default Gateway:     172.17.145.20

I'm not that familiair with these routes, so maybe I'm misinterpreting
them. But let's say I want to connect to 72.14.215.104. I guess this
simply goes to the default gateway of 172.17.145.20. I'm not sure if
this gets resolved any further, or that routing stops now. In the latter
case, I guess it never reaches 172.17.145.20, which is on a NAT with an
outside address of 192.87.167.62. Should it be routed to 192.87.167.62
instead?

I didn't thoroughly anonymize the logs because I want to make sure I
include all the important details.

Best,
Koen


On Mon, 2007-12-17 at 17:08 +0100, Jan Just Keijser wrote:
> Hi Koen,
> 
> the server statement
>   push "redirect-gateway"
> is causing your default route to be altered; this sometimes also causes 
> the route to the VPN server itself to be redirected thru the VPN tunnel: 
> a very nice Catch-22 where all traffic for the VPN server is actually 
> sent thru the VPN tunnel .
> 
> The solution in 99% of the cases is to add a statement like
> 
> push "route 192.87.167.62 255.255.255.255 net_gateway"
> 
> this will cause the traffic for the VPN server (which is 192.87 as I 
> read in your log files) to NOT go thru the VPN tunnel.
> 
> HTH/groetjes,
> 
> JJK
> 
> PS It is best to anonymize log files and IP address before posting.
> 
> Koen Vermeer wrote:
> > Hi,
> >
> > I'm trying to set up a system where people can use openvpn to pretend
> > like they're part of the server's network. OpenVPN on the server is
> > running in a local network, connected through a NAT. The local network
> > is 172.17.145.0 and the server has unlimited access to the outside
> > world. Incoming UDP connections on the OpenVPN port are routed to the
> > server. The client is also in a NAT, with it's local network at
> > 192.168.1.0. Unfortunately, my setup doesn't seem to work. Any help is
> > appreciated! If more information on my setup is useful, please let me
> > know what else I should provide you with.
> >
> >
> > The server's config is:
> >
> > port 1194
> > proto udp
> > dev tap
> > ca ca.cer
> > cert server.cer
> > key server.key
> > dh DH.pem
> > ifconfig-pool-persist ipp.txt
> > server-bridge 172.17.145.20 255.255.255.0 172.17.145.70 172.17.145.90
> > push "redirect-gateway"
> > keepalive 10 120
> > comp-lzo
> > user nobody
> > group nogroup
> > persist-key
> > persist-tun
> > status openvpn-status.log
> > log openvpn.log
> > verb 3
> >
> > The client's config is:
> >
> > client
> > dev tap
> > proto udp
> > remote 192.87.167.62 1194
> > resolv-retry infinite
> > nobind
> > persist-key
> > persist-tun
> > ca ca.cer
> > cert client.cer
> > key client.key
> > ns-cert-type server
> > comp-lzo
> > verb 3
> >
> > The server's log is:
> > Mon Dec 17 15:56:59 2007 OpenVPN 2.0.9 x86_64-pc-linux-gnu [SSL] [LZO]
> > [EPOLL] built on May 19 2007
> > Mon Dec 17 15:56:59 2007 Diffie-Hellman initialized with 1024 bit key
> > Mon Dec 17 15:56:59 2007 TLS-Auth MTU parms [ L:1574 D:138 EF:38 EB:0
> > ET:0 EL:0 ]
> > Mon Dec 17 15:56:59 2007 TUN/TAP device tap0 opened
> > Mon Dec 17 15:56:59 2007 Data Channel MTU parms [ L:1574 D:1450 EF:42
> > EB:135 ET:32 EL:0 AF:3/1 ]
> > Mon Dec 17 15:56:59 2007 GID set to nogroup
> > Mon Dec 17 15:56:59 2007 UID set to nobody
> > Mon Dec 17 15:56:59 2007 UDPv4 link local (bound): [undef]:1194
> > Mon Dec 17 15:56:59 2007 UDPv4 link remote: [undef]
> > Mon Dec 17 15:56:59 2007 MULTI: multi_init called, r=256 v=256
> > Mon Dec 17 15:56:59 2007 IFCONFIG POOL: base=172.17.145.70 size=21
> > Mon Dec 17 15:56:59 2007 IFCONFIG POOL LIST
> > Mon Dec 17 15:56:59 2007 Test_client,172.17.145.70
> > Mon Dec 17 15:56:59 2007 Initialization Sequence Completed
> > Mon Dec 17 15:57:07 2007 MULTI: multi_create_instance called
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 Re-using SSL/TLS context
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 LZO compression initialized
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 Control Channel MTU parms
> > [ L:1574 D:138 EF:38 EB:0 ET:0 EL:0 ]
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 Data Channel MTU parms
> > [ L:1574 D:1450 EF:42 EB:135 ET:32 EL:0 AF:3/1 ]
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 Local Options hash (VER=V4):
> > 'f7df56b8'
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 Expected Remote Options hash
> > (VER=V4): 'd79ca330'
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 TLS: Initial packet from
> > 87.212.14.143:1563, sid=541fef01 fda297ed
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 VERIFY OK:
> > depth=1, /C=NL/L=Delft/O=qwerty/CN=Koen_Vermeer/emailAddress=t@xxx
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 VERIFY OK:
> > depth=0, /C=NL/O=i-Optics_Nederland_BV/CN=Test_client
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 Data Channel Encrypt: Cipher
> > 'BF-CBC' initialized with 128 bit key
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 Data Channel Encrypt: Using
> > 160 bit message hash 'SHA1' for HMAC authentication
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 Data Channel Decrypt: Cipher
> > 'BF-CBC' initialized with 128 bit key
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 Data Channel Decrypt: Using
> > 160 bit message hash 'SHA1' for HMAC authentication
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 Control Channel: TLSv1,
> > cipher TLSv1/SSLv3 DHE-RSA-AES256-SHA, 1024 bit RSA
> > Mon Dec 17 15:57:07 2007 87.212.14.143:1563 [Test_client] Peer
> > Connection Initiated with 87.212.14.143:1563
> > Mon Dec 17 15:57:08 2007 Test_client/87.212.14.143:1563 PUSH: Received
> > control message: 'PUSH_REQUEST'
> > Mon Dec 17 15:57:08 2007 Test_client/87.212.14.143:1563 SENT CONTROL
> > [Test_client]: 'PUSH_REPLY,redirect-gateway,route-gateway
> > 172.17.145.20,ping 10,ping-restart 120,ifconfig 172.17.145.70
> > 255.255.255.0' (status=1)
> > Mon Dec 17 15:57:09 2007 Test_client/87.212.14.143:1563 MULTI: Learn:
> > 00:ff:d0:52:4d:87 -> Test_client/87.212.14.143:1563
> > Mon Dec 17 15:59:41 2007 read UDPv4 [ECONNREFUSED]: Connection refused
> > (code=111)
> > [Some more of these]
> > Mon Dec 17 16:03:29 2007 Test_client/87.212.14.143:1563 [Test_client]
> > Inactivity timeout (--ping-restart), restarting
> > Mon Dec 17 16:03:29 2007 Test_client/87.212.14.143:1563
> > SIGUSR1[soft,ping-restart] received, client-instance restarting
> >
> > At the client, the log shows:
> >
> > Mon Dec 17 15:54:15 2007 OpenVPN 2.1_rc4 Win32-MinGW [SSL] [LZO2] built
> > on Apr 25 2007
> > Mon Dec 17 15:54:15 2007 LZO compression initialized
> > Mon Dec 17 15:54:15 2007 Control Channel MTU parms [ L:1574 D:138 EF:38
> > EB:0 ET:0 EL:0 ]
> > Mon Dec 17 15:54:15 2007 Data Channel MTU parms [ L:1574 D:1450 EF:42
> > EB:135 ET:32 EL:0 AF:3/1 ]
> > Mon Dec 17 15:54:15 2007 Local Options hash (VER=V4): 'd79ca330'
> > Mon Dec 17 15:54:15 2007 Expected Remote Options hash (VER=V4):
> > 'f7df56b8'
> > Mon Dec 17 15:54:15 2007 Socket Buffers: R=[8192->8192] S=[8192->8192]
> > Mon Dec 17 15:54:15 2007 UDPv4 link local: [undef]
> > Mon Dec 17 15:54:15 2007 UDPv4 link remote: 192.87.167.62:1194
> > Mon Dec 17 15:54:15 2007 TLS: Initial packet from 192.87.167.62:1194,
> > sid=08aa98d9 04667673
> > Mon Dec 17 15:54:16 2007 VERIFY OK:
> > depth=1, /C=NL/L=Delft/O=qwerty/CN=Koen_Vermeer/emailAddress=t@xxx
> > Mon Dec 17 15:54:16 2007 VERIFY OK: nsCertType=SERVER
> > Mon Dec 17 15:54:16 2007 VERIFY OK:
> > depth=0, /C=NL/O=i-Optics_Nederland_BV/CN=tst
> > Mon Dec 17 15:54:17 2007 Data Channel Encrypt: Cipher 'BF-CBC'
> > initialized with 128 bit key
> > Mon Dec 17 15:54:17 2007 Data Channel Encrypt: Using 160 bit message
> > hash 'SHA1' for HMAC authentication
> > Mon Dec 17 15:54:17 2007 Control Channel: TLSv1, cipher TLSv1/SSLv3
> > DHE-RSA-AES256-SHA, 2048 bit RSA
> > Mon Dec 17 15:54:17 2007 [tst] Peer Connection Initiated with
> > 192.87.167.62:1194
> > Mon Dec 17 15:54:18 2007 SENT CONTROL [tst]: 'PUSH_REQUEST' (status=1)
> > Mon Dec 17 15:54:18 2007 PUSH: Received control message:
> > 'PUSH_REPLY,redirect-gateway,route-gateway 172.17.145.20,ping
> > 10,ping-restart 120,ifconfig 172.17.145.70 255.255.255.0'
> > Mon Dec 17 15:54:18 2007 OPTIONS IMPORT: timers and/or timeouts modified
> > Mon Dec 17 15:54:18 2007 OPTIONS IMPORT: --ifconfig/up options modified
> > Mon Dec 17 15:54:18 2007 OPTIONS IMPORT: route options modified
> > Mon Dec 17 15:54:18 2007 OPTIONS IMPORT: route-related options modified
> > Mon Dec 17 15:54:19 2007 TAP-WIN32 device [Local Area Connection 2]
> > opened: \\.\Global\{D0524D87-70C1-457B-899A-E02B2879DB6E}.tap
> > Mon Dec 17 15:54:19 2007 TAP-Win32 Driver Version 9.3 
> > Mon Dec 17 15:54:19 2007 TAP-Win32 MTU=1500
> > Mon Dec 17 15:54:19 2007 Notified TAP-Win32 driver to set a DHCP
> > IP/netmask of 172.17.145.70/255.255.255.0 on interface
> > {D0524D87-70C1-457B-899A-E02B2879DB6E} [DHCP-serv: 172.17.145.0,
> > lease-time: 31536000]
> > Mon Dec 17 15:54:19 2007 Successful ARP Flush on interface [196610]
> > {D0524D87-70C1-457B-899A-E02B2879DB6E}
> > Mon Dec 17 15:54:24 2007 TEST ROUTES: 1/1 succeeded len=0 ret=1 a=0
> > u/d=up
> > Mon Dec 17 15:54:24 2007 route ADD 192.87.167.62 MASK 255.255.255.255
> > 192.168.1.1
> > Mon Dec 17 15:54:24 2007 Route addition via IPAPI succeeded [adaptive]
> > Mon Dec 17 15:54:24 2007 route DELETE 0.0.0.0 MASK 0.0.0.0 192.168.1.1
> > Mon Dec 17 15:54:24 2007 Route deletion via IPAPI succeeded [adaptive]
> > Mon Dec 17 15:54:24 2007 route ADD 0.0.0.0 MASK 0.0.0.0 172.17.145.20
> > Mon Dec 17 15:54:24 2007 Route addition via IPAPI succeeded [adaptive]
> > Mon Dec 17 15:54:24 2007 Initialization Sequence Completed
> >
> > On the client, even a 'ping 172.17.145.20' doesn't work. Likewise,
> > browsing the internet fails (server not found).
> >
> >
> >   
> 

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