NAT: Strict issues

[Intiwrun]

I wanted to play a game of BO2 Zombies with a friend of mine, but even if we tried some fixes, his Nat keeps being Strict and we got no idea how to play togheter

[WolflexZ]

Your friend has to port forward his internet.
https://plutonium.pw/docs/custom-games/#what-is-port-forwarding