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RE: [Openvpn-users] Odd behaviour on tap0 in beta11 with tcp-server


  • Subject: RE: [Openvpn-users] Odd behaviour on tap0 in beta11 with tcp-server
  • From: "Palic, Darko" <darko.palic@xxxxxx>
  • Date: Wed, 1 Sep 2004 10:30:45 +0200

> >> Client sends
> >> arp who-has 192.168.2.2 tell 192.168.2.4
> >>
> >> Server receives
> >> 65:1c:4a:c8:08:06 null > ff:ff:ff:ff:00:ff sap 08 I (s=3,r=2,C) len=22
> >
> As no one else has reported anything about corrupted packets, it's really
> hard to tell where the problem is.
> 
> You will have to narrow down the problem.
> 
> Try connecting with another machine.
> 
> Try using an other version of openvpn.
> 
> Try to hook up the client mashine with just a cross-over cable to the
> openvpn server to make sure it's not a network problem between the client
> and server.
> 
> and so on until you can say exactly under which circumstances the problem
> occurs, and when it doesn't.
> 
> If I understood you correct the problem occurs every time you, so it
> shouldn't be too hard to narrow it down...

Now I can tell a little bit more about the situation, but it doesn't fix the
problem. 
If I use the same configuration on an other machine, it is running fine.

Now to my setup:
The working environment:
Debian woody
Celeron 2GHz
Realtek 

The needed/problematic environment:
SuSE9.1 pro
VIA 1GHz CPU on a EPIA CL-1000 mainboard, which has 2 integrated VIA nics

Every time I connect to the SuSE91. machine I will get errors. I also tried
to recompile the bins, but without success. The problem is, that I cannot
switch the EPIA environment, because it's a productive machine....

The only thing I could determine, is the connection is running if I get
following error on both machines:
Wed Sep  1 10:08:07 2004 us=427959 Note: Cannot ioctl TUNSETIFF tap0:
Invalid argument (errno=22)
Wed Sep  1 10:08:07 2004 us=428200 Note: Attempting fallback to kernel 2.2
TUN/TAP interface

But because the error occurs only some times I cannot try to reproduce it.
Is there any option to force 2.2 TUN/TAP device?

Any other hints or suggestions?


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