Re: [Qemu-devel] Re: Network bridging without adding bridge with brctl, possible?

[Gerhard Wiesinger <lists@wiesinger.com>]

On Sun, 20 Feb 2011, Jan Kiszka wrote:

> On 2011-02-19 20:32, Gerhard Wiesinger wrote:
>> Any other suggestions to achieve this?
>
> http://virt.kernelnewbies.org/MacVTap
>
> Enabling host<->guest communication this way is still a bit unhandy
> IMHO. You need a fairly recent iproute2 version, then set up macvtap
> like this
>
>    ip link add link eth1 name macvtap0 type macvtap mode bridge
>
> And you additionally seem to need a separate macvlan device attached to
> that bridge, configured to the IP of the host.
>
>    ip link add link eth1 name macvlan0 type macvlan mode bridge
>    ifconfig macvlan0 ...
>
> Not sure if this is by design or due to internals of the networking
> stack, but it looks unintuitive from user perspective. Maybe Arnd can
> shed a light on this.

Thnx Jan. That's exactly I'm looking for.

Is it possible to use then a legacy type network card for "old" guests?

e.g. ne2k_pci, i82551, i82557b, i82559er, rtl8139, e1000, pcnet
and also virtio, virtio-net-pci

> Of course, you could also simply offload all that setup to libvirt.

http://wiki.libvirt.org/page/Networking
But that still needs a bridge on ethernet level and break up the existing 
interface, right?

BTW: From: http://virt.kernelnewbies.org/MacVTap
As of QEMU 0.12:
qemu -net nic,model=virtio,addr=1a:46:0b:ca:bc:7b -net tap,fd=3 3<>/dev/tap11
Is there a newer Syntax with tap interfaces possible (QEMU GIT) without 
bash redirects?

Thnx.

Ciao,
Gerhard

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