I checked and it was. The Maximum Number of DHCP Users is set to 10. I checked my DHCP clients table and it shows all the 3 computers and the Wii. I then clicked DHCP release which deletes the IP addresses and renew DHCP which is supposed to get a new IP address (i duno why I did it). It's on automatic configuration.
The 360 started working. However, I went online with the computers and then I couldn't go online on the 360 again. I did the whole DHCP release again and it works. How do I fix it so I don't have to keep deleting and renewing?