Re: ipv6 anycast

[Ole Troan <ot@cisco.com>]

>>>> I use them for my network. RFC5969.
>>> 
>>> aha!  do you mean
>>> 
>>> 5.  Troubleshooting and Traceability
>>>  ...
>>>  The 6rd CE and BR SHOULD support the IPv6 Subnet-Router anycast
>>>  address [RFC4291] for its own 6rd delegated prefix.  This allows, for
>>>  example, IPv6 ICMP echo messages to be sent to the 6rd virtual
>>>  interface itself for additional troubleshooting of the internal
>>>  operation of 6rd at a given CE or BR.
>> 
>> indeed. and note that this makes no requirement that _any_ type of
>> interface has to support this.
> 
> btw, that is an rfc, not a network :)

that's why I said my network (as in at home), which even I have to admit isn't very large. ;-)
> 
> do you know if free.fr and/or others actually deployed and tested this?
> among other things, i worry about code paths that are rarely, if ever,
> used.

I have tested it (and yes, it was broken the first time I tried). IPv6 anycast is exactly like IPv4 anycast though, so
the 'anycast' code path isn't very large. the only difference is with how ND is done (not an issue on this link), and the source address selection (pick a unicast address as source instead of anycast).

cheers,
Ole