OpenVPN: Error: IP packet with unknown IP version
this is a checklist for the error on an OpenVPN 2.4 Server “IP packet with unknown IP version” when a client has established a connection successfully but you can not reach any IP Addresses in the network.
- Check compression parameter. Ensure that if set the client and server has the some compression config:
Note: comp-lzo is deprecated. For native OpenVPN 2.4 (Client and Server) installations use compress.
- Ensure that client and server uses the same dev-type
Set dev tap an both.