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

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Date:	Mon, 8 Sep 2008 19:26:00 -0700
From:	David Stevens <dlstevens@...ibm.com>
To:	Bernhard Schmidt <berni@...kenwald.de>
Cc:	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

Did you specify the interface on those?

I don't know whether or not I should trust that sin_scope_id==0,
which Brian also mentioned.

For link-local addresses, it must be specified, though you can
get there from an SO_BINDTODEVICE too. The error if it isn't
there is EINVAL, but sin_scope_id is showing as 0 for both cases.
The send side shouldn't actually care anything about the group
number unless they matched different routes, which I don't see
in your routing table.

So, I think it's back to running it on a debug kernel that prints
something distinguishing from the different EINVAL cases
to narrow it down.

                                        +-DLS

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