linux gateway and router = redundant?

[augie]

orignially i was thinking of having a linux gateway and a router in between 
my LAN, and the rest of the world. but then i started reading the specs for 
my router (linksys 4port), and i saw that it did everything i was expecting 
the linux gateway to do. ie. filtering, logging, and port forwarding.

so now im thinking a linux gateway on top of a hardware router is gonna be 
pointless. are there bennefits to this kind of redundancy or should i just 
stick with just the router?

--augie