Any CenturyLink IPv6 engineers/tech people around?

Hello all,

Don't suppose there's any CenturyLink engineers/tech people on this list that can look into a problem with their IPv6 6rd service?

Got multiple customers on CenturyLink (including myself), with IPv6 through their 6rd service since native isn't available yet. IPv6 assignments from one customer can't talk to IPv6 assignments on another CL customer.

Seems to be in the 6rd server end doing it, as I can set up a direct tunnel between customers and it passes IPv6 traffic normally. I can provide more details and some tests if needed from my end.


Thanks for the off-list replies. Think I've got the issues figured out.

6rd behaves a lot like 6to4 in how it handles traffic destined for hosts in the same ISP IPv6 subnet - and aggressive filtering of protocol 41 on external facing interfaces can break that.

RFC5569 has more details on implementation, in case anyone else runs into this problem at a later point.