I had the same problem, VPN would not work. I have the Netgear R7000 router. I had comcast turn on bridge mode for the TC8305C, but the R7000 would not obtain an IP address from comcast. (Maybe they needed to do some kind of registration with the MAC address of the R7000, but the tech I had just said my device was incompatible with their network). I took the TC8305C back to my local office and got the Arris device, and the VPN is working now.
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