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 \
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
All 3 combinations didn't work.
Maybe someone can give me a hint what's wrong.
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