linksys

I'm pretty sure I just have to open ports in order to host my own server. Does anyone know what ports I have to open? Also is there anything else I would have to do to get it working? Normally when I try to host a game it doesnt show up in the server list and nobody can join. I'm running the...

I'm currently on a linksys router and in ESF I always host, but nobody joins (for the past few months). On BYOND, I set my port that is open, and people can join my game, but on Half-Life, I didn't see an option to set a port when hosting. If you know how, please let me know.