netdev - Re: [IPv6] "sendmsg: invalid argument" to multicast group after some time

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Date:	Tue, 9 Sep 2008 00:17:35 -0700
From:	David Stevens <dlstevens@...ibm.com>
To:	Rémi Denis-Courmont <rdenis@...phalempin.com>
Cc:	Bernhard Schmidt <berni@...kenwald.de>,
	Brian Haley <brian.haley@...com>, netdev@...r.kernel.org,
	netdev-owner@...r.kernel.org
Subject: Re: [IPv6] "sendmsg: invalid argument" to multicast group after some time

netdev-owner@...r.kernel.org wrote on 09/08/2008 11:52:05 PM:

> 
> On Tue, 9 Sep 2008 02:38:53 +0200, Bernhard Schmidt 
<berni@...kenwald.de>
> 
> wrote:
> 
> > ff00::/8 dev teredo  metric 256  mtu 1280 advmss 1220 hoplimit 
4294967295
> 
>                ^^^^^^
> 
> Uho... that interface is not multicast-capable. Not sure how the kernel
> 
> handles the conflicting routes.

        Multicast programs shouldn't rely on the routing
table at all, IMAO. Unicast routing has nothing at all
to do with multicast routing, where a single address
means copying and forwarding to multiple different
segments, and the address has nothing at all to do with
the routing topology.
        That's why the scope_id should be set (and to
the proper index for eth0), but I think either strace
is lying to us here or they're using SO_BINDTODEVICE
or IP_MULTICAST_IF.
        But when it's breaking, I imagine it is ending
up on the wrong interface and thus the EINVAL... I
just don't see how some addresses still work while
others fail at the same time. :-)

                                                +-DLS

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