[Discuss] Host chaining?

[Dustin Nicholas Jenkins]

My network consists of the following:

INTERNET --> Linksys Router --> Linux Media Center --> Xbox

My Linux Media Center (HTPC) is wireless to my router, which means I 
have one extra ethernet port that I would like to use to put my Xbox 
online as I don't have any Cat5/6 outlets in the living room.  Is there 
a way to set it up such that the Xbox is just another client on my 
network?  I could just put a DHCP server on my HTPC, but then I'd have 
a subnet that I don't want.  I guess what I want is my HTPC to be a hub 
of some kind and both it and the Xbox are leaf nodes.

Thanks,
Dustin