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

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Subject: Re: [Xen-users] Xen's interface in promiscuous mode
From: "Ricardo J. Barberis" <ricardo.barberis@xxxxxxxxxxxx>
Date: Tue, 24 Feb 2009 23:21:29 -0200
Cc: James Harper <james.harper@xxxxxxxxxxxxxxxx>
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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?

TIA and best regards,
Ricardo J. Barberis 
Senior SysAdmin - I+D 
Dattatec.com :: Soluciones de Web Hosting 

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