How to run a dedicated server question.

Ok my Freaking router is a piece of crap, when i forward the ports my router firewall stops the game from runing right. So i turn off the router firewall and it wont let me forward the ports. and my router is so old i cant set exceptions on its firewall for PF. Any advice?

Even a better question could someone do remote on my compy and set it up right for me? i think i may be doing something wrong.

what brand router and what model please