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From: Jamie Lokier <jamie@shareable.org>
To: qemu-devel@nongnu.org
Cc: dlaor@redhat.com, Mark McLoughlin <markmc@redhat.com>,
	kvm <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] Re: [PATCH 1/5] virtio-net: Allow setting the MAC address via set_config
Date: Thu, 15 Jan 2009 13:11:08 +0000	[thread overview]
Message-ID: <20090115131108.GC32368@shareable.org> (raw)
In-Reply-To: <200901142214.46522.paul@codesourcery.com>

Paul Brook wrote:
> > What I meant is that if we allow the guest to change his mac address, it
> > can deliberately
> > change it to other hosts/guests mac and thus create networking problems.
> > Although guest can always mangle packets, maybe it worth enforcing these
> > macs for the guest.
> 
> This doesn't seem any different to real hardware that allows you to
> change the MAC address.

Indeed I have used that on several occasions to workaround pointless
firewalls and home networking restrictions.

People doing MAC-level hot-failover in high-availability environments
do it too.

-- Jamie

WARNING: multiple messages have this Message-ID (diff)
From: Jamie Lokier <jamie@shareable.org>
To: qemu-devel@nongnu.org
Cc: Mark McLoughlin <markmc@redhat.com>,
	dlaor@redhat.com, kvm <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] Re: [PATCH 1/5] virtio-net: Allow setting the MAC address via set_config
Date: Thu, 15 Jan 2009 13:11:08 +0000	[thread overview]
Message-ID: <20090115131108.GC32368@shareable.org> (raw)
In-Reply-To: <200901142214.46522.paul@codesourcery.com>

Paul Brook wrote:
> > What I meant is that if we allow the guest to change his mac address, it
> > can deliberately
> > change it to other hosts/guests mac and thus create networking problems.
> > Although guest can always mangle packets, maybe it worth enforcing these
> > macs for the guest.
> 
> This doesn't seem any different to real hardware that allows you to
> change the MAC address.

Indeed I have used that on several occasions to workaround pointless
firewalls and home networking restrictions.

People doing MAC-level hot-failover in high-availability environments
do it too.

-- Jamie

  reply	other threads:[~2009-01-15 13:11 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-01-13 21:23 [PATCH 1/5] virtio-net: Allow setting the MAC address via set_config Alex Williamson
2009-01-13 21:23 ` [Qemu-devel] " Alex Williamson
2009-01-14 10:05 ` Dor Laor
2009-01-14 10:05   ` [Qemu-devel] " Dor Laor
2009-01-14 15:34   ` Alex Williamson
2009-01-14 15:34     ` [Qemu-devel] " Alex Williamson
2009-01-14 16:41     ` Jamie Lokier
2009-01-14 16:41       ` Jamie Lokier
2009-01-14 22:06       ` Dor Laor
2009-01-14 22:14         ` Paul Brook
2009-01-15 13:11           ` Jamie Lokier [this message]
2009-01-15 13:11             ` Jamie Lokier
2009-01-15 13:12         ` Jamie Lokier
2009-01-15 13:41           ` Avi Kivity
2009-01-15 13:41             ` Avi Kivity
2009-01-18  9:37           ` Dor Laor
2009-01-18  9:42             ` Avi Kivity
2009-01-14 22:08       ` Dor Laor

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