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Client computers don't know about WAN IP in such case. They are talking with only LAN IP of NAT router. Router have WAN IP but computers don't. WAN IP can be changed any time in some cases. (as you know)
You would see WAN IP in server accesss log.
There is a hint in "MORE LIKE THIS"
OK, I was just fishing for a creative answer and I do understand networking and why Get SystemIPAddress doesn't work. What I was trying was creating a web portal and using a web page like whatismyip.com and the web scraping that WAN IP off of it. But I thought maybe there is a method through a plugin that I'm not aware of. I had not thought about getting the WAN IP from the Server Access log and I know with Base Elements plugin, I can make a system call to list the clients attached with tmsadmin and I'll have to do that with a PSoS. So thanks for the suggestion and I'll explore that to see if I can figure it out that way.