I'm at my parents' now and trying to figure out why IPv6 isn't working. They have Comcast, and their router is an Asus RT-N16 running Toastman's newest Tomato firmware.

The modem is in bridge mode yet its admin screen shows it getting its own IPv4 and IPv6 addresses - potentially for phone service, which my parents also have through Comcast. Not sure.

In any case, the router gets a totally different IPv4 address than the modem, and doesn't get any IPv6 address. I have the router set to use DHCPv6 with prefix delegation, and to accept RA from the WAN.

Any ideas? I thought Comcast had IPv6 running on its entire network.

Thanks!