Okay so for the longest time my NAT has been strict or moderate but i want to get it open because well when it is open it is better. Only problem is my brother also has an xbox and he has open NAT while i had the stict or moderate. So i found out how to get mine open only problem it i had to change the last numbers of the IP address to match my xbox's and bam im open, but now my brother is not. And when we try to put the same port on but name it xbox2 it says "Port already exists". So is it my Router (which is through our cable company.) Router is a Cisco Linksys E1200. Thanks.
However when i looked on the compatibility routers for multiple Xbox's this on did not show up an was wondering if maybe that list hasn't been updated recently.