From: Kristoff Bonne <kristoff.bonne@skypro.be>
To: netdev@vger.kernel.org
Subject: ipv6 multicasting: "interface-local" scope
Date: Thu, 14 Apr 2011 19:23:07 +0200 [thread overview]
Message-ID: <io7ahs$cpt$1@dough.gmane.org> (raw)
Hi,
(This is a repost of a message I posted yesterday in
linux.network.general but to which I have not seen any replies).
If I understand RFC 4291 correctly, the ipv6 multicast ip-addresses
ffx1:<scope> are "interface local" scope.
In draft-ietf-ipngwg-scoping-arch-02, I read this:
"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 for an application I am working on.
However when I try it and make a small program that sends 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 -I think-
is the opposite of what RFC4291 tells me should happen.
Am I missing something? or is this a bug?
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.
reply other threads:[~2011-04-14 17:25 UTC|newest]
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