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Just confused:  Router to Xfinity Tower?

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Last Modified: 2017-03-19
Got a friend that is able to connect his laptop to an Xfinity tower from his home.  It's one of those "city-wide" wi-fi setups, and he's able to get free internet from his home.  Here's the catch:  this undoubtedly introduces security risks for him, AND... connecting to his little HP printer wirelessly has become something of a chore.  The HP Envy 4500 printer just isn't connecting to anything...

Here's the question:  if he were to buy an inexpensive router/firewall, just what would he need to look for in features.  It needs to be able to get it's public IP from that Xfinity tower... then what?  Is that a "bridge?"  Would a simple wireless router be able to RECEIVE the signal from the tower AND SEND the signal to his laptop?

We've tried to connect his laptop to the printer without a router... but been unable to do so.  It may be that the printer isn't strong enough to get the signal from the tower... (yes?)... or we're missing something else.  In any event, he's been unable to add that printer to his Windows 10 laptop...  (Blue wireless light on laptop just blinks endlessly... nothing we do lets it connect.)

Thanks for your help...
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