Hi,
I have unfortunately terrible cellular service with AT&T at my home and am evaluating options. AT&T has given me a cell booster and I am trying to connect it, and have been instructed by AT&T that I have to open the following UDP ports of the modem to allow the booster to activate: UDP / 500 IPSec port, UDP / 4500 IPSec port, Emergency Services Protocol (ESP) 50, and UDP 123 NTP port (timing synch). Initially, AT&T said my internet provider had to enable this, but I own the modem (not Xfinity, my internet provider). I seem to be unable to talk live to an ARRIS rep to resolve this. Does anyone have advice? Thank you!
