It is possible that the IPv6 problems I was seeing were related to my DIR655 sometimes getting a "/60" and sometimes getting a "/64" PD prefix assignment combined with a CMTS bug. See NetDog
's post »Re: [IPv6] Comcast IPv6 Address Assignment/Delegation
for details. Since that announcement, I have only been getting the "/64" PD prefix assignments, and I do not currently see the problem with CDN and round robin IPv6 servers frequently not responding.--
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