Hiroki Sato wrote: > va> Can any IPv6 unicast or link-local address be configured as an anycast > va> address of a router? > > Yes. There is no restriction about address scope. > > You might want to read RFC 4291, which defines Subnet-Router anycast > address, and RFC 2526, which defines the other reserved IPv6 subnet > anycast addresses. In general, the former one can be used for > routing purpose.
Interestingly, RFC4291 says that "All routers are required to support the Subnet-Router anycast addresses for the subnets to which they have interfaces." In practice, I don't observe this. A FreeBSD router does not configure such an address automatically, for example. RFC2526 is dim, I think it's because of this RFC the last usable address on a subnet ends in ff7f instead of ffff. I wonder if anyone anywhere uses those subnet anycast addresses. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/
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