Re: Passing multiple ethernet adapters to QEMU guest

[Reco <recoverym4n@enotuniq.net>]

	Hi.

On Thu, May 14, 2020 at 03:13:50PM +0100, Andrew Wood wrote:
> How do I pass more than one ethernet adapter to a QEMU guest.
> 
> Doing it like this seems to attach them both on virtual bridge br1
> 
> kvm ....  -net nic,macaddr=52:54:00:00:01:08,model=rtl8139 -net tap,ifname=br1p5 \
> -net nic,macaddr=52:54:00:00:02:08,model=rtl8139 -net tap,ifname=br3p8

Qemu uses /etc/qemu-ifup by default which deliberately puts tap
interface to the bridge which corresponds to the default route.

To override this you have to:

1) Write your own replacement for /etc/qemu-ifup, two in this case.
2) Pass it to qemu with the "script" option:

kvm ....  -net nic,macaddr=52:54:00:00:01:08,model=rtl8139 \
	-net tap,ifname=br1p5,script=/etc/my-qemu-bridge1 \
-net nic,macaddr=52:54:00:00:02:08,model=rtl8139 \
	-net tap,ifname=br3p8,scrupt=/etc/my-qemu-bridge2

Reco