WRT54G wont work for both internet and xbox 360

Question

I bought the Linksys WRT54G so I can play my Xbox 360 and be on the Internet at the same time. I am not using it wireless meaning that i do have ethernet cords plugged in for both my internet and my 360. When i play my 360 it kicks me off the internet and vice versa. Any help?

Answer 1

Access setup page....
Please click on the tab "Application and gaming" and click on sub
tab "Port range forwarding"
1) On the first line in Application box type in "Xbox", in start box
type in 88, in end box type in 88, in protocol keep it both, in ip
address type in 192.168.1.20 and give a check mark on enable box.
2)   On the second line in Application box type in "Xbox", in start box
type in 3074, in end box type in 3074, in protocol keep it both, in ip
address type in 192.168.1.20 and give a check mark on enable box.
3) Now save the settings
4) Once you return to the setup page, click on the tab "Administration"
and disable the UPNP and save the settings.
5) Now assign the given ip address on your xbox
   ip address :- 192.168.1.20
   subnet mask :- 255.255.255.0
   default gateway :- 192.168.1.1
Please assign the dns address on the xbox
  primary dns :- 4.2.2.2
  secondary dns :- 192.168.1.1
6) Please try to test your xbox live.