Packet to ff02::1

[Michael Kjorling]

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Well, Pim also wrote (just beyond what you quoted) that "the one with
3ffe:8350:1:51:210:7bff:fe30:591 replies from its link-local address".
This seems to imply that all other hosts ignore it (receiving
something and acting upon it by sending a reply is not the same thing
as I understand it at least).

I have not read the definition of IPv6 Neighbor Discovery, but from
what I have understood of it this seems like a good thing. How is a
host supposed to know whether any kind of broadcasted packet is for it
or not before analyzing it? ("Host" being either a router or a
client.)


Michael Kjörling


On Mar 28 2002 17:47 +0700, Robert Elz wrote:

>     Date:        Wed, 27 Mar 2002 07:44:07 +0100
>     From:        Pim van Pelt <pim@ipng.nl>
>     Message-ID:  <20020327064407.GC6163@bfib.colo.bit.nl>
>
>   | Now what happens with IPv6 when your box wants to talk to another ?
>   | 1. IPv6 neighbor solicitation is sent to IPv6 multicast address ff02::1
>   |
>   |    fe80::203:47ff:fe73:1f0f -> ff02::1 Neighbor Solicitation for=20
>   |    		3ffe:8350:1:51:210:7bff:fe30:591
>   | 2. All boxes receive (this is mandatory!),
>
> That isn't the way I remember ND being defined, and nor is it what
> implementations seem to actually do.
>
> 17:44:34.435594 3ffe:8001:2:181::2 > ff02::1:ff0f:41cf: icmp6: neighbor sol: who has 3ffe:8001:2:181:210:a4ff:fe0f:41cf
> 17:44:34.435756 3ffe:8001:2:181:210:a4ff:fe0f:41cf > 3ffe:8001:2:181::2: icmp6: neighbor adv: tgt is 3ffe:8001:2:181:210:a4ff:fe0f:41cf
> 17:44:34.435829 3ffe:8001:2:181::2 > 3ffe:8001:2:181:210:a4ff:fe0f:41cf: icmp6: echo request
> 17:44:34.435927 3ffe:8001:2:181:210:a4ff:fe0f:41cf > 3ffe:8001:2:181::2: icmp6: echo reply
>
> kre
>
> ps: ff02::1 is similar to IPv4 broadcast (255.255.255.255 or the net specific
> broadcast address) but it only bothers IPv6 nodes, not everything else that
> happens to be connected to the net.  Filtering it isn't a good idea, but
> it also isn't likely to be a disaster.

- -- 
Michael Kjörling  --  Programmer/Network administrator  ^..^
Internet: michael@kjorling.com -- FidoNet: 2:204/254.4   \/
PGP: 95f1 074d 336d f8f0 f297 6a5b 2aa3 7bfd 8a70 e33e

``And indeed people sometimes speak of man's "bestial" cruelty, but
this is very unfair and insulting to the beasts: a beast can never be
so cruel as a man, so ingeniously, so artistically cruel.''
(Ivan Karamazov, in Dostoyevsky's 'The Brothers Karamazov')
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