Hiroki Sato wrote: > va> > va> Can any IPv6 unicast or link-local address be configured as an > anycast > va> > va> address of a router? > va> > > va> > Yes. There is no restriction about address scope. > va> > > va> > You might want to read RFC 4291, which defines Subnet-Router anycast > va> > address, and RFC 2526, which defines the other reserved IPv6 subnet > va> > anycast addresses. In general, the former one can be used for > va> > routing purpose. > va> > va> Interestingly, RFC4291 says that "All routers are required to support > va> the Subnet-Router anycast addresses for the subnets to which they have > va> interfaces." In practice, I don't observe this. A FreeBSD router does > va> not configure such an address automatically, for example. > > They will be automatically configured when an ipv6_prefix_IF > rc.conf(5) variable is used to configure a prefix: > > ----(from rc.conf(5) man page)---- > ipv6_prefix_ed0="2001:db8:1:0 2001:db8:2:0" > > is equivalent to the following: > > ifconfig_ed0_alias0="inet6 2001:db8:1:: eui64 prefixlen 64" > ifconfig_ed0_alias1="inet6 2001:db8:1:: prefixlen 64 anycast" > ifconfig_ed0_alias2="inet6 2001:db8:2:: eui64 prefixlen 64" > ifconfig_ed0_alias3="inet6 2001:db8:2:: prefixlen 64 anycast" > > These Subnet-Router anycast addresses will be added only when > ipv6_gateway_enable is YES. > ----------------------------------
Dear Hiroki, You are an invaluable source of information. I wish all the above should make it into the Handbook, the chapter on IPv6. -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/
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