interface-local scope ipv6 multicast

[Kristoff Bonne <kristoff.bonne@xxxxxxxxx>]

Hi,


If I understand RFC 4291 correctly, the ipv6 multicast ip-addresses
ffx1:<scope> are "interface local scope.


According draft-ietf-ipngwg-scoping-arch-02 "The interface-local scope
spans a single interface only; a multicast address of interface-local
scope is useful only for loopback delivery of multicasts within a single
node, for example, as a form of inter-process communication within a
computer".


This is exactly what I want to do, however when I try it and make a
small C-program that spits out UDP packats to the ipv6 multicast address
ff11::1234, I do see them show up on remote machines on my LAN. So it
looks like these packets do leave my local compute which is -I think-
not what the RFC tells me.

Or am I missing something?


The machine on which I have tested this runs ubuntu 10.04.1 LTE with
kernel 2.6.32-30-generic



Anybody any ideas?



links:
- RFC4291: http://tools.ietf.org/html/rfc4291#section-2.7
- draft-ietf-ipngwg-scoping-arch-02:
http://tools.ietf.org/html/draft-ietf-ipngwg-scoping-arch-02)

Cheerio! Kr. Bonne.

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