#1 If you want to be lazy, here is what you could do.
a) In the router find the Universal Plug and Play (UPnP) setting.
b) Enable it and save/apply.
#2 If you find a server that you want to forward for is not UPnP aware, then I point you tohttp://www.howtogeek.com/122227/how-to-quickly-forward-ports-on-your-router-from-a-desktop-application/
With info about: UPnP Port Mapper
#3 However if you followed my advise, while I fixed your issue so that you do not need to forward ports in the NAT router anymore I just created another problem/issue.
a) If UPnP is enabled in the router
b) If an user has UPnP turned on, on their computer (Windows) / system (Xbox)
c) If an user has UPnP allowed by their software firewall on their computer.
d) and if an user has an UPnP aware app (for example uTorrent) on their computer.
Then the user could open port(s) in the router without knowing the router's control log-in!
#4 You might ask why someone would want to use UPnP with their NAT router, even with the flaw of how it works.
The answer is below this dotted line. ----
a) As noted at http://portforward.com/networking/static-ip-ps4/
For Play Station it would be NAT Type 2.
b) As noted at http://portforward.com/networking/staticip-xbox360.htm
for the Xbox 360 it would be Xbox LIVE results should be "Connected."
c) As noted at http://portforward.com/networking/static-ip-xbox-one/
for the Xbox One it would be NAT Type Open.
#2 I have read/heard that if someone only has one Non Bogan IP Address the only way to get more than game console having NAT Type 2 / Xbox LIVE results Connected / Open is to use Universal Plug and Play (UPnP).
#3 I have no idea if what I read/heard is true or not about game consoles, getting NAT Type 2 / Xbox LIVE results Connected / Open, and with only one non bogan IP Address using UPnP.
#4 If someone does not want to use UPnP and they wanted more than one game console having NAT Type 2 / Xbox LIVE results Connected / Open then an answer is to get more than one non bogan / Public IP Address.