PortForward.com - Free Help Setting up Your Router or Firewall
PortForward.com - Free Help Setting up Your Router or Firewall
Essentially porttriggering will only occur when the program is active and using the port. Port forwarding will open and leave open the port all the time...regardless if the program is using the port at that time or not.
You can only have one i.p at a time in the DMZ of your router.