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Re: [Openvpn-users] Connection still alive but not working


  • Subject: Re: [Openvpn-users] Connection still alive but not working
  • From: Christoph Haas <email@xxxxxxxxxxxxxxxxx>
  • Date: Wed, 4 Oct 2006 21:20:20 +0200

On Wednesday 04 October 2006 14:05, Bruno Cruvelier wrote:
> I have a VPN connection with a Windows client (XP and OpenVPN Gui) and a
> Linux server (Debian).
> It works great but sometimes, when I try to get a file (> 1MB) from the
> distant network, I lost the connection. The strange things is that the
> connection is still alive for OpenVPN Gui (green computer icon on the
> tasks bar) but I can't go anywhere on the distant network (ping, file
> sharing, http...). The logs doesn't show anything anormal because it's
> still connected for him.
>
> Did one of you already get this kind of error ?

Sounds like MTU/fragmentation problems. Do you drop packet fragments at 
your firewall? Read about the "fragment" and "mssfix" options. Also look 
at your network traffic (ethereal/wireshark on Debian, Packetyzer on 
Windows) and look for retransmissions. Does it work better if you lower 
the MTU?

Can you ping/traceroute/mtr through the tunnel when the problem occurs?

 Christoph
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