Noel, >> it seems that a lot of the issues could be mitigated by simple >> connectivity test. > > Well, IPv6 Neighbour Discovery is just the thing. I gather it's turned off > on 6to4 links, which in retrospect was probably a mistake. I would > recommend that it be turned on, but apparently the WG decided against > making that recommendation in the '6to4 fixes' document? IPv6 Neighbour Discovery requires a multicast capable link and support for link-local addresses. a 6to4 link doesn't support either. NUD could be made to work, but I don't think NUD is any better than any other connectivity test. e.g. a "BFD echo" style one as specified for 6rd. cheers, Ole _______________________________________________ Ietf mailing list Ietf@xxxxxxxx https://www.ietf.org/mailman/listinfo/ietf