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

["Bruno Cruvelier" <bcruvelier@xxxxxxxxxxxx>]

----- Original Message ----- 
From: "Christoph Haas" <email@xxxxxxxxxxxxxxxxx>
To: <openvpn-users@xxxxxxxxxxxxxxxxxxxxx>
Sent: Wednesday, October 04, 2006 9:20 PM
Subject: Re: [Openvpn-users] Connection still alive but not working


> 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?

The firewall allows everything from the tunnel.
I've read about these options.
I've tried to put the mtu to 1492.

I have to wait for some returns to see if it works.



> Can you ping/traceroute/mtr through the tunnel when the problem occurs?
I'll ask the client about it.

Thx for all your advice.
> Christoph
>
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