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I recently got a new gig-speed connection with Comcast and picked up an Arris SB8200 modem. However, after having it provisioned, I only seem to have access through IPv6, and no connectivity with IPv4. I've tried to contact support over the phone about this, but nothing worked so far.
As a side note, we also don't seem to have DOCSIS 3.1 connectivity for uploads, but we do for downloads, though I've found this may be limited to area.
Thank you for visiting the forums!
I've asked a Comcast employee to help you. You should expect a reply in this thread.
PS: DOCSIS 3.1 is currently downstream only.