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[Openvpn-users] Perfomance and mtu

  • Subject: [Openvpn-users] Perfomance and mtu
  • From: Bernhard Gustl Bauer <gustl@xxxxxxxxxx>
  • Date: Thu, 08 Apr 2004 18:47:46 +0200


I have an tunnel running with these settings:

/usr/sbin/openvpn --tun-mtu 1500 --tun-mtu-extra 64 --dev tap0 \
                  --ping 40 --remote $BR_REM_IP_2  --float --daemon \
                  --verb 3

This tunnel goes over a wlan. When I transmit data without tunnel I get a netto rate of 5MBit/s. When I use the tunnel I get 3,7 MBit/s. So the tunnel eats about 25% data rate. Is this normal? I don't think so.

I don't use any compression, so this shouldn't be a problem of cpu speed.

So I tried to figure whats wrong. Maybe the mtu's are not ideal. The wlan interface I use has a mtu of 1500. I looked after mtu in the man page and tried:

--tun-mtu 1436 --tun-mtu-extra 64

--link-mtu 1500 --tun-mtu-extra 64

--link-mtu 1500

All 3 combinations didn't work.

Maybe someone can give me a hint what's wrong.



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