just so we are clear, your ip is 98.132.more numbers?
If that's the case, then him not being able to connect means that the port isnt forwarded to your computer.
You say you just have a cable that connects to the internet, are you on a schools LAN or something? If this is the case, then you probably cannot host a server that your brother can join from outside the university because the schools admins won't forward ports to your computer.
Perhaps your brother could do the hosting, as you would have no problem joining a game.
If this isn't the case, then we'll have to go over routers and modems and things, thats the only other way to connect to the internet.