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Re: [Qemu-devel] [PER] Re: socket, mcast looping back frames -> IPv6 br
From: |
Samuel Thibault |
Subject: |
Re: [Qemu-devel] [PER] Re: socket, mcast looping back frames -> IPv6 broken |
Date: |
Mon, 1 Apr 2013 11:32:29 +0200 |
User-agent: |
Mutt/1.5.21+34 (58baf7c9f32f) (2010-12-30) |
Mike Lovell, le Mon 01 Apr 2013 00:35:03 -0600, a écrit :
> On 03/08/2013 05:47 AM, Samuel Thibault wrote:
> >Samuel Thibault, le Fri 08 Mar 2013 10:08:55 +0100, a écrit :
> >>There does exist some unique address, which is returned by recvfrom,
> >>I'll have a look at how to get access to it.
> >Ah, no, it's not unique... It's just the host IP address and the same
> >port as the multicast address, so it'll be the same for all qemus on the
> >same host. I've checked how Linux bounces the datagram, it's through
> >the loopback interface, and thus dispatched over all listeners without
> >distinction. I don't see any way to get the information that the packet
> >comes from us, except using the ethernet content.
>
> one solution is to actually use two sockets. one that is bound to the
> multicast address, which receives the multicast packets, and another that is
> just bound to any ephemeral udp port, which is used for sending packets.
Mmm, that should work indeed.
> if the group is interested is a solution like this, i can probably make some
> time over the next couple days to cook up a patch. thoughts?
Yes, please.
Samuel