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See, I have exactly the same setup (SB6xxx + AE) and on TWC in NYC it just doesn't work. The AE gets an IPv6 address from the modem, but TWC isn't assigning it a prefix, so all IPv6 devices behind the AE just sit there twiddling their digital thumbs.

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TWC is definitely not as far along in their deployment. It might just take some more time. =\

Edit: If I recall correctly, when Comcast was doing their initial deployment they started with end nodes only (not delegating prefixes). Then moved to delegated /64s. Now are moving on to delegated /60s and more.

Some older AE/TC don't support DHCP-PD even if you update them with the latest firmware (that's really a shame IMHO). It might also just be your AE settings. Check that it is configured in router mode, with access mode set to native or automatic.

http://www.dslreports.com/forum/r27251137-IPv6-Time-Capsule-...

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