iTunes sharing with a router??

[Illmatic]

I live in an apartment building with cable internet and want to share my iTunes library with my neighbor. I can access his no problem because he doesn't use a router, but unfortunantly I do. I can't figure out what IP address he should use to connect, can someone please help me out before I break my other computer just so I don't need a router...Thanks

 

[Sun Baked]

mac-to-mac networking question - no other thread has given a good answer

 

[iJon]

2 things to check. make sure you open the proper ports. and go to www.whatismyip.com and you will be set.

iJon