I thought this was a very well written and straight forward guide to setting up port forwarding for the good old AT&T BGW210 router of which there are literally millions in use in the USA.
I can certify it’s easy to follow and works first time (at least for two installations I assisted with)
Hope somebody finds it useful.
Set up Port Forwarding for BGW210 - AT&T Internet Customer Support (att.com)
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