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Re: [Openvpn-users] Strange throughput-problem


  • Subject: Re: [Openvpn-users] Strange throughput-problem
  • From: James Yonan <jim@xxxxxxxxx>
  • Date: Fri, 8 Jul 2005 09:59:32 -0600 (MDT)

On Fri, 8 Jul 2005, Erich Titl wrote:

> Hi
> 
> Fridtjof Busse wrote:
> > * Erich Titl <erich.titl@xxxxxxxx>:
> > 
> >>Could be incompatibility in negotiation between your new NIC and the
> >>DSL modem. Are you sure OpenVPN plays any role at all?
> > 
> > 
> > Well, if I use the VPN-tunnel. speed sucks.
> > If I don't, speed is OK. So i'd say OpenVPN is involved in some way.
> > Maybe it's just the tun0-interface, but I don't know how to verify this.
> >
> 
> Does it go away when you stop the OpenVPN tunnel?
> Does it start as soon as you start the OpenVPN tunnel?
> Do you lose speed for non-tunnel traffic when the tunnel is running?

A few more things to try out:

* Does OpenVPN over UDP vs. TCP change anything?

* If possible, try benchmarking an OpenVPN connection between two machines 
on the same LAN, to eliminate the possibility of other devices in the path 
contributing to the slowdown.

Note that under normal circumstances, you should see a speed degradation
of 10% to 20% provided the CPU of the machine running OpenVPN is not 
saturated.

James

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