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You can only forward a port to one location (IP address).
In some cases, this may cause issues when multiple LAN devices (computers,
game consoles, or VOIP ATAs) attempt to use online gaming as same time or
make multiple VOIP service connections.
In these cases, you would need to use an alternate port for any subsequent
connections after the first device.
Please consult your VOIP provider or game manufacturer for assistance with this.
XBox Setup
There are two ways of allowing your XBox to communicate with the internet. One is through
port forwarding and the other is through the DMZ feature. Port forwarding will enable specified
ports on the router to get access to your XBox to communicate with the internet as if they
were directly connected by allowing access through. Setting your XBox as a DMZ host opens
all the ports on the router to allow access to a designated device.
Before you configure the router, you will need to set a static IP address on your
XBox. Please follow the instructions at the link below to set a static IP address on
your XBox:
http://portforward.com/networking/staticip-xbox360.htm
You can use an IP address like 192.168.1.100 for example.