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Re: [Openvpn-users] VPN comes up but not usable for high traffic


  • Subject: Re: [Openvpn-users] VPN comes up but not usable for high traffic
  • From: Matthias Apitz <m.apitz@xxxxxxxxxxxx>
  • Date: Mon, 5 Mar 2007 15:30:10 +0100

El día Monday, March 05, 2007 a las 10:33:25AM +0000, Erich Titl escribió:

> It smells like a firewall issue and not really a OpenVPN issue.
> 
> - Did you check the packets on the client too?
> - Have a look at timeouts, fragmentation issues.
> 
> 
> Erich
> 

Hi Erich,

You're right, it is definitely a firewall/fragmentation issue
and not a problem related to OpenVPN. I've checked the messages
in the stand-by firewall again and they registered the blocking
of fragments:

Mar  2 14:23:07 cazador ipmon[167]: 14:23:06.423701 xl1 @0:93 b 10.0.1.202 -> xxx.xxx.xxx.xxx PR udp len 20 (41) (frag 31761:21@1432) OUT

I have to expand the ipfilter rules with '... keep frags' and
will do a test.

Interesting remains, why only the stand-by firewall is doing
such a fragmentation...

Thx again anyway

	matthias
-- 
Matthias Apitz
Manager Technical Support - OCLC PICA GmbH
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