Do you have any more specifics about the MTU? Like what value to set so my VPN will work? I tried disabling the firewall on my gateway, but I still get an 800 error when trying to access my VPN. Comcast has been NO help whatsoever. I'm about to switch carriers because of this. I need the upgraded modem (TC8305C) for faster speeds, but my old 2.0 modem worked fine. This 3.0 "all in one" modem killed my VPN connection and now I'm dead in the water. Anyone find anything to make this work before I leave Comcast?
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