Another same IP issue

I was able to host games where others can join, however, my brother who is using the same internet as me cannot join my game. We have a router and I believe it's the same IP thing. I've looked through the forum and tried most of the solutions offered but to no avail. Can anyone provide me with a clearer solution to this problem as I'm not much of a computer person? I'd greatly appreciate it. :tiphat:

Are you using Ghost ++ or GhostOne ?

nope I'm not using Ghost or anything.

Enable lan-lan connections in router
Ports of your both warcrafts cant be same. Change them in Options/gameplay