Another post asking a question

#1
What IP do I use when port forwarding?

I've correctly set up the port forwarding but I'm stumped on which IP do I use, am I using my Default Gateway IP or my IpV4 or is there some IP that I don't know about.
If I had a dollar for every time someone griefed the respawn shuttle I would be dirt poor because I never die to be respawned 8)