Just a quick update on this. I copied the certs you guys helped me extract onto my Edgerouter ER-4 and have successfully gotten it to authenticate with AT&T. The crappy Pace 5268AC has been decommissioned and banished to the attic with the ONT plugged directly into the eth0 interface of my ER-4. Thanks again to everyone on this!

Stu
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If you want it to break, buy Sony!