said by NetDog:I am thinking it is not a CPE router issue but a modem issue at this point. I have one other person with the same issue same modem firmware. I have also emailed customers with IPv6 running on both CMTS's and they are not having any issues with IPv6. So let me send some emails and track down people next week to work on this one.
FYI.. the modem is SB6121\SB6120 1.0.6.8, so if anyone else has a SB6121\SB6120 and IPv6 please PM me or post here.. I would like to know if others are having or not having issues with IPv6.
I am using an SB6121:
Firmware Name: SB_KOMODO-1.0.6.8-SCM01-NOSH
Boot Version: PSPU-Boot(25CLK) 1.0.12.18m3
Hardware Version: 5.0
I connect to a Cadant CMTS: (CMTS-MAC=00:01:5c:3c:f4:48) located in Murfreesboro, TN.
I have no problems with Comcast's native dual stack using a D-Link DIR655 (Hardware Version: B1 Firmware Version: 2.10NA).
I also use a Comcast/Netgear WNR1000v2-VC (Firmware Version V1.2.2.56NA) as a guest router, and except for an annoying anomaly where the router's WAN IPv6 address (but not its prefix) and its corresponding PD LAN prefix (but not its local IPv6 address) randomly change every couple of weeks (which is apparently a Comcast/Netgear firmware problem), IPv6 is working for and behind that router which is connected to the same SB6121 cable modem (I have a "c05" modem config file) through Netgear FS105 and ZyXEL GS105S switches.
If it helps to visualize my connection, you can see my current network diagram at: »
www.dcs-net.net/image/DC ··· gram.gif