Re: VDE?

[Thomas Huth]

On 31/10/2022 09.42, Tomas By wrote:
> On Mon, 31 Oct 2022 09:20:27 +0100, Thomas Huth wrote:
> > "-nic" does not have any help output, I think.
>
> Yes it does (unless I misunderstand things), same text as -netdev.

Oh, that's interesting! Recent versions of QEMU only show an error message 
in that case. Seems like this regressed somewhere between QEMU v5.1.0 and 5.2.0.

> > That error message should not happen with "-nic", I think. Could you
> > provide your full command line to make it clear what happens here?
>
> |qemu-system-i386 -hda disk.img -boot c -m 8 -device ne2k_isa -nic user

Ah, ok, so it's the "-device" option that is causing the problem here. If 
you want to use "-device", you've got to use -netdev instead of -nic, 
something like:

 -netdev user,id=n1 -device ne2k_isa,netdev=n1

The -nic option is a combination of -netdev and -device, so in your case, 
you could use this instead:

 -nic user,model=ne2k_isa

See also this page for more information:

 https://www.qemu.org/2018/05/31/nic-parameter/

> > If you urgently want to use VDE, then you likely have to compile it on
> > your own. Otherwise you could try tap (I'd recommend libvirt for
> > easier setup here),
>
> Is there some example somewhere showing how to do that, using current
> versions of the tools etc?

If you want to use tap and libvirt, maybe the easiest solution is to use 
"virt-manager" to define your machines. Otherwise have a try with the 
"socket" network backend, I think that could work in your case, too.

 Thomas