Search for a guide on the forums. I have a router and I am unable to host a server and play on it at the same time, some routers are like that. I think Richardo (username: Lexen1) wrote a good guide a while ago, it might be archived.
EDIT:
Here we go:
http://www.eqemulator.net/forums/sho...ghlight=router
also
http://www.eqemulator.net/forums/sho...ghlight=router