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[Openvpn-users] Re: Odd Tunnel Problems


  • Subject: [Openvpn-users] Re: Odd Tunnel Problems
  • From: Luc Van der Veken <lucvdv@xxxxxxxx>
  • Date: Tue, 07 Oct 2003 09:29:02 +0200

On Mon, 06 Oct 2003 19:33:05 -0700, AthlonRob <AthlonRob@xxxxxxxx>
wrote:

> Any idea what might be up with this?  MTU problem, maybe?  I don't know
> what the symptoms of that would be... or how it might relate to the tap0
> interface being bridged....

On windows with v 1.5 beta, MTU problems look like this: the tunnel
works, you can ping through it, you can access shared directories and
copy files across, but when you try to launch a terminal server
session it connects and then just sits there showing a black window
until it times out.

That sounds a bit similar to your symptoms, so I'd try with a lower
MTU.


A bit funny was that when I pinged with large packets with the don't
fragment flag set, everything came through as if there was no MTU
problem.
It took me a while (and some sniffing on the UDP packets) before I
realized that OpenVPN uses compression, the packets that were really
sent were only 132 bytes long while they contained 1472 byte pings,
probably 1472 bytes of zeroes :)



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