I've seen some banter about this. As of now, is IPv6 working with Comcast on these devices? I picked one up this evening and no dice on IPv6.
I can successfully ping a v6 address directly from the router CLI, but I'm not able to hit anything from computers on the network. The closest thing I'm able to get is pinging the link local address of the LAN interface on the ZyXel. Anything further than that is a bust.
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