Just got a new modem, and since then only some websited have been loading. After doing some looking around this forum it seems I need to PM @ComcastJohnN my MAC address. And I can only PM if I have done one post, so here it is.
I had a chance to reply to your private message regarding troubleshooting your IPV4/IPV6 issues. I'd be happy to help if @ComcastJohnN hasn't done so already. Chat with you soon!