Erik Nordmark wrote:
Alexandru Petrescu wrote:
Templin, Fred L wrote:
I was referring to multicast RAs for purposes of SLAAC. If you
did stateful address configuration and used RAs only to
advertise default router, that is different.
Its not only about stateful address configuration; unsolicited
RAs with incomplete information can be followed by an RS/RA
exchange where the RA contains prefixes for SLAAC.
I kind of see how this would work. A quirk may be with RS being
sent to multicast only, by 2461:
Destination Address Typically the all-routers multicast address.
Point-to-point links are usually non multicast capable.
That seems backwards.
Point to point links are by definition IP multicast capable. When
sending a packet on a point to point link, whether the final
destination is unicast or multicast, the same thing happens - the
packet is sent to the other end of the link.
RFC 2461 point-to-point - a link that connects exactly two
interfaces. A point-to-point link is assumed to have multicast
capability and have a link-local address.
Sounds right, I may have had it backwards.
A router multicasting a packet to two neighbours on a Ethernet sends
only one packet. A router with two multicast-capable point-to-point
links sends two packets.
But I think it's right to say that a point-to-point link is inherently
multicast capable, I had it wrong.
Alex
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