Help opening up NAT for xbox live because IP address keeps changing.?

When you do your port forwarding, use the MAC address, not the IP address. A MAC address references a unique piece of hardware on a network. You do not need to enable the DMZ. Look at a href="http://www.portforwarding.com" rel="nofollow"http://www.portforwarding.com/a to see how to do this for your specific router. Just make sure to use the MAC address, not the IP address. You can find your xbox MAC address under the network settings area on the xbox. Good Luck.