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RE: [Xen-users] Xen's interface in promiscuous mode

To: "Ricardo J. Barberis" <ricardo.barberis@xxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Xen's interface in promiscuous mode
From: "James Harper" <james.harper@xxxxxxxxxxxxxxxx>
Date: Thu, 26 Feb 2009 09:31:14 +1100
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Thread-topic: [Xen-users] Xen's interface in promiscuous mode
> El Lunes 23 Febrero 2009, James Harper escribió:
> > > Hello all,
> > > Playing with Xen on GNU/Debian Lenny, I just discovered that all my
> > > virtual network cards are in promiscuous mode by default.
> > > Changing that manually does not seems to change anything (that is,
> > > everything still works great).
> > >
> > > Is there any reason to have virtual network cards in promiscuous mode
> >
> > ?
> >
> > > And where can I change this default behaviour ?
> >
> > The physical network adapters in Dom0 will be in promiscuous mode if
> > they are joined to a bridge.
> >
> > The virtual network adapters in DomU are in promiscuous modem because
> > (as of the version of Xen in Lenny) they don't support multicast, and so
> > the only way they can receive multicast packets is to be in promiscuous
> > mode.
> >
> > As of 3.3.0 or thereabouts, there is a way for the frontend to tell the
> > backend which multicast packets it is interested in, so the behaviour
> > may be different there.
> Hi James,
> Can you elaborate on that, or give a link to read more about it?

Unless someone has written up some docs, your best bet is to look at the code - 
specifically the headers in xen/include/public/io


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