Not a "Firewall", Just NAT (as in all allowed with only NAT, super simple to get past for any sixth grade kid and an old iPhone or Android...gee, I wonder what is on port 80?). As for credentials, yeah, we all hold the Comcast close to our chests right? And it is impossible to "spoof" an SSID (even more so a public one)...sure.
We use non-licensed 802 all the time in moving data, all the time. Facility to Facility, building to building. What I am running is basically a MESH with my WLC.
With the right bridge and mast - over 20 miles is not uncommon in the right environment. NLOS 5 miles is common with 14dB@40MHz, LOS plays more with mast height and obstructions. But then, that is where 900MHz comes to play also.
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