Given the following scenario
Network 192.168.56.0 with openvpn on host 192.168.56.13
ifconfig tun0 10.192.168.56 10.192.168.28
public IP 194.95.X.Y
Network 192.168.28.0 with openvpn on host 192.168.28.26
ifconfig tun0 10.192.168.28 10.192.168.56
public IP 194.95.A.B
Using "tcp-server" on 192.168.56.13 and "tcp-client" on 192.168.28.26
all works as expected.
Using "tcp-client" on 192.168.56.13 and "tcp-server" on 192.168.28.26
all works as expected.
But whe using UDP on both sides it doesn't work. 192.168.56.13 can't ping