https://forums.att.com/conversations/at ... a13b#M7940
I tried the solution and confirmed that PACE modem is the culprit, but forwarding all the ports is not working 100% for me. My VPN and VOIP are failing intermittently.
I use my own router/firewall, VOIP and VPN server. It will not work with double NAT. I do not trust AT&T router to provide sufficient protection and prefer to use my own firewall.
Sonic support says "Unfortunately this is unsupported territory". Why is this unsupported? I thought sonic was all about giving best service with knowledgeable staff. DMZ is well accepted industry practice for people who know what they are doing. And, it was working fine till AT&T screwed up.
If Sonic staff is unable to understand DMZ mode, How do I get Arris BGW210-700 as suggested by someone on that forum? Do I need to involve Mr. Dane Jasper for such a trivial matter?