working on multiplayer

so I've been working on Don't expect mercy for a little over a month now, and I finally have the basics for the multiplayer set up, but the problem is that terrain refuses to work properly and is being a duck. so I'm going to have to redo the terrain for the nth time.

but before that, I want to make sure that the game can work if two players are on different LAN's, aka, connected to two different routers, which might take a while(a few days)