Goal: Log in to the Pi from WAN.
Problem: Pi is on the LAN without 192.. address, and my Cable provider changes my WAN IP address from time to time.
Solution: Sign up with a dynamic DNS service, and set up a little program on the Pi that frequently posts its WAN address to the service.
It's dead simple with No-IP.com, and described neatly here on their support page.
Dynamic DNS Help and Support - No-IP
Of course, something needs to be listening on a port. So that port needs to be forwarded from the router to the Pi. I have a AVN Fritz!Box, which has a config page for such things. So for instance, to allow ssh access, you'd forward port 22 to port 22 on your Pi.
Works flawlessly on my setup!
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