SSDR V2 - Radio's IP?

If i am understanding your dilemma...If your router supports it, you can use a DDNS server like No-IP or the one provided by your router manufacturer (Like ASUSCOMM.COM) then you don't need to remember actual IP address, just the URL name you register with the DDNS server.  Then in your router just forward that port number to the appropriate computer/device and port number.

For example  joeham.no-ip.net:20807    (I hope that isn't really someone's address...)

Not sure what you mean with VNC... VNC for me is a Media Player... Anyway, If you have a computer at your "radio qth" you can use Teamviewer. Just install Teamviewer on your different clients and connect. No need to know the IP-address.

When you go to launch SmartSDR remotely the radios available via Smartlink are displayed in a list and noted with the Blue SmartLink box.  If you hold you mouse over this Blue SmartLink box then it shows a bunch of information including....Radio Serial #, Lic Ver, Radio ID (Mac?), Radio IP, TCP and UDP port numbers and FIrmware version.  IF someone is already connected to that radio it also show as "In Use" and some information on the network ID of the person connected.

I am not sure if this answers your question or not.

John