OpenVPN Logs "IP Packet with unknown IP version=15"

Solution 1:

I have seen this error when comp-lzo was enabled on the client, but disabled on the server.

Solution 2:

I just had this same thing and found that my client configuration was set to: dev tap

While my server configuration was set to dev tun

They were trying to operate in two different modes and getting confused. Might you want to check this between your two configuration files?

I set both of them to what I really had wanted to do which was: dev tun and the logs stopped getting filled up with those errors.

Solution 3:

I had exactly the same issue on a Linode machine - perhaps it is related. There's an investigation and fix by Dan McGee here: http://www.toofishes.net/blog/

echo 'lo' > /sys/module/aoe/parameters/aoe_iflist