Hiroki Sato wrote: > va> > va> If a FreeBSD host receives router advertisements from several IPv6 > va> routers, on a LAN segment, which would be chosen as the default gateway? > > One reachable router will be selected based on the default router > preference value in RA, which is defined in RFC 4191. If all of the > routers have the same preference, the first one will win. > > va> Can this be used for failover? > > Yes. > > Another way to realize failover is to use a common anycast address on > multiple routers. For example, a router is always able to have > fe80::/64 as an anycast address like this: > > router# ifconfig igb0 inet6 fe80::/64 anycast > > and you can simply configure fe80::/64 as the default router on the > hosts. Multiple routers with the same fe80::/64 can coexist on the > same segment, and hosts will choose one of them with no further > configuration. A caveat in this case is that the first router always > wins and there is no knob to set the preferences across the routers > with the same anycast address configured.
Thank you Hiroki, this was very informative and useful. Can any IPv6 unicast or link-local address be configured as an anycast address of a router? Is this a replacement for VRRP and carp(4)? -- Victor Sudakov, VAS4-RIPE, VAS47-RIPN 2:5005/49@fidonet http://vas.tomsk.ru/
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