Comcast ipv6 on MyNet N900

Has anyone been able to get Comcast ipv6 to work on the MyNet N900?  Or ipv6 to work at all?  Works as it should with a different router but not with the N900.

The link below might help, but is better for you to contact Comcast tech support directly.

http://customer.comcast.com/help-and-support/internet/about-ipv6/

Doesn’t answer the question, has anybody got  IPv6 to work with the N900?  I can get it to work and have tested it with other routers but it doesn’t work on the My Net N900.