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[Openvpn-users] Problem with connection behind firewall


  • Subject: [Openvpn-users] Problem with connection behind firewall
  • From: Christian Guedel <me@xxxxxxxxxx>
  • Date: Tue, 14 Dec 2004 19:59:43 +0100

Hi list,

I'm new here on the list, and I'm also new to VPN. I ran a PPTP server
for several days now, but this seems not to work on another port than
1739. So I tried openvpn. This doesn't work as expected:

The facts:
  - at my school we got a firewall that is very restrictive, but there
are some 
  - open ports: TCP/80, TCP/443, TCP/110
  - I've running a gentoo server at home
  - I'd like to forward the whole connection from my home to school
through the firewall
  - I think this is possible?

At home I get 4 public IP's assigned by my ISP, so I can try the VPN.
This does work for me at home with no problem (no encryption, but this
isn't necessary for me). But at school I get some strange errors:

On the server: 
Dec 14 13:06:10 [openvpn] Listening for incoming TCP connection on
[undef]:5000 
Dec 14 13:06:11 [openvpn] TCP connection established with
212.117.97.246:45193 
Dec 14 13:06:11 [openvpn] TCPv4_SERVER link local (bound): [undef]:5000 
Dec 14 13:06:11 [openvpn] TCPv4_SERVER link remote:
212.117.97.246:45193 
Dec 14 13:06:21 [openvpn] Connection reset, restarting [-1] 
Dec 14 13:06:22 [openvpn] LZO compression initialized 
Dec 14 13:06:22 [openvpn] TUN/TAP device tap0 opened 
Dec 14 13:06:22 [openvpn] /sbin/ifconfig tap0 10.100.100.1 netmask
255.255.255.0 mtu 1492 broadcast 10.100.100.255 
Dec 14 13:06:22 [openvpn] Listening for incoming TCP connection on
[undef]:5000 
Dec 14 13:06:24 [openvpn] TCP connection established with
212.117.97.246:45200 
Dec 14 13:06:24 [openvpn] TCPv4_SERVER link local (bound): [undef]:5000 
Dec 14 13:06:24 [openvpn] TCPv4_SERVER link remote:
212.117.97.246:45200 
Dec 14 13:07:14 [openvpn] Connection reset, restarting [-1] 
Dec 14 13:07:15 [openvpn] LZO compression initialized 
Dec 14 13:07:15 [openvpn] TUN/TAP device tap0 opened 
Dec 14 13:07:15 [openvpn] /sbin/ifconfig tap0 10.100.100.1 netmask
255.255.255.0 mtu 1492 broadcast 10.100.100.255 
Dec 14 13:07:15 [openvpn] Listening for incoming TCP connection on
[undef]:5000

And on the client:
Dec 14 13:06:47 mobile openvpn[29548]: LZO compression initialized 
Dec 14 13:06:47 mobile openvpn[29548]: TUN/TAP device tap0 opened 
Dec 14 13:06:47 mobile openvpn[29548]: /sbin/ifconfig tap0 10.100.100.2
netmask 255.255.255.0 mtu 1492 broadcast 10.100.100.255 
Dec 14 13:06:47 mobile openvpn[29548]: /etc/openvpn/lan/route.sh tap0
1492 1571 10.100.100.2 255.255.255.0 init 
Dec 14 13:06:47 mobile openvpn[29548]: Attempting to establish TCP
connection wi th 217.162.245.52:110 
Dec 14 13:06:47 mobile openvpn[29548]: TCP connection established with
217.162.2 45.52:110 
Dec 14 13:06:47 mobile openvpn[29548]: TCPv4_CLIENT link local: [undef] 
Dec 14 13:06:47 mobile openvpn[29548]: TCPv4_CLIENT link remote:
217.162.245.52: 110 
Dec 14 13:06:47 mobile openvpn[29548]: Connection reset, restarting [0] 
Dec 14 13:06:50 mobile openvpn[29548]: LZO compression initialized 
Dec 14 13:06:50 mobile openvpn[29548]: TUN/TAP device tap0 opened 
Dec 14 13:06:50 mobile openvpn[29548]: /sbin/ifconfig tap0 10.100.100.2
netmask 255.255.255.0 mtu 1492 broadcast 10.100.100.255 
Dec 14 13:06:50 mobile openvpn[29548]: /etc/openvpn/lan/route.sh tap0
1492 1571 10.100.100.2 255.255.255.0 init 
Dec 14 13:06:50 mobile openvpn[29548]: Attempting to establish TCP
connection wi th 217.162.245.52:110 
Dec 14 13:06:50 mobile openvpn[29548]: TCP connection established with
217.162.2 45.52:110 
Dec 14 13:06:50 mobile openvpn[29548]: TCPv4_CLIENT link local: [undef] 
Dec 14 13:06:50 mobile openvpn[29548]: TCPv4_CLIENT link remote:
217.162.245.52: 110

I don't know why this doesn't work! Maybe some of you have...

Thanks,
-- 
Christian Guedel <me@xxxxxxxxxx>


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