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
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