Thank goodness for this thread, I've been very frustrated the last 3 days over this issue.
So I have a SBG10 modem router combo that I recently set up new out of the box. After becoming an xfinity customer I realized that sites like youtube worked but hardly any other sites would connect. Then I discovered that IPv6 was the only thing giving me internet. IPv4 is nonexistant, which explains why the other sites wouldn't work. Anyways, @ComcastJohnN or @ComcastChe , if you have time to help me I would greatly appreciate it. I'll be PMing you (if I can after this) a little later on with my HFC MAC.
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