I found out I can now use my own modem on my business account and drop the leasing fee. Prior to doing this, the Comcast speed test showed my IPv4 and IPv6 speeds. Now it doesn't. My router is a NetGear WNDR3700 with IPv6 set at Auto Detect. From what I'm reading on http://mydeviceinfo.comcast.net/, my Motorola SB6120 passes through IPv6. I called back support and they are elevating to level 2. I wonder when you use your modem IPv6 is dropped automatically.
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