RA for a different router

[Nick Hilliard]

On 19/12/2009 16:43, Bit Gossip wrote:
> do you know if it is possible to use RA for the router to advertise not
> itself but some other address as the default router for the prefix?

Basically, no.  This isn't part of the spec, because RA announcements come
from routers which can route traffic for a particular ipv6 prefix.
Otherwise, they wouldn't be announcing that they could route traffic for
that prefix, right?

> I had a look also at DHCPv6 for the same purpose but no option, at list
> with IOS for doing that.... Is it possible with DHCPv6?

One day, it will be possible to set a default gateway using dhcpv6, just
not yet.  The specification is in I-D draft-dec-dhcpv6-route-option.  I
posted a froth-at-the-mouth rant about this some while ago on nanog:

http://mailman.nanog.org/pipermail/nanog/2009-October/014222.html

I.O.W. if the current situation with regard to RA and dhcpv6 leaves you
speechless, your understanding of it is probably correct: that right now,
you will need to use both RA and DHCPv6 in order to get "functional" host
autoconfiguration.

Nick