I cant connect tow 360's to my Belkin Router

We have two xboxs in my household. But we cant seem to have them both connected to the internet at the same time. It will only allow one xbox online at keep disconnecting the other one. My router is a ****** F5D8231-4 v5000. Thanks in advance

you can change both systems ip's manually, for example, 192.168.1.2, 192.168.1.3

router's default ip is 192.168.1.1, so the first system would be2 and the second xbox would be 3, get it ?

just enable Enable DHCP Server.