Re: [Qemu-discuss] Setting a interface name with qemu-bridge-helper?

[Shaun Reitan]

You can specifiy a ifname is you use -netdev tap however if you try and 
use the bridge-helper script you get an error. Also looking at the code 
of the bridge-helper I can see there is no logic for specificing a name. 
 I've already modified the helper script to now allow a name to be 
passed. I'm just now having difficulty figuring out what sections in the 
qemu source need to be modifed to allow this as well.

--
Shaun Reitan
NDCHost.com

------ Original Message ------
From: "Thomas Huth" <address@hidden>
To: "Shaun Reitan" <address@hidden>; address@hidden
Sent: 2018-01-14 11:03:32 PM
Subject: Re: [Qemu-discuss] Setting a interface name with 
qemu-bridge-helper?

> On 13.01.2018 01:34, Shaun Reitan wrote:
> > When starting vm's with '-netdev bridge,id=net0,br=br0' each vm is 
> > given
> > a tapX interface name and from what I can tell, there is no simple way
> > to figure out which interface belongs to which VM.
> >
> > I'd like to see a name option added to it which would be passed along 
> > to
> > the qemu-bridge-helper.  Something like '-netdev
> > bridge,id=net0,br=br0,name=vm1net0' or '-netdev
> > bridge,id=net0,br=br0,ifname=vm1net0'
> >
> > Any reason why setting the tap's interface name was left out before I 
> > go
> > attempting to patch this functionality in? Or maybe is there a fast 
> > and
> > simple way to get the tap interface of the VM
>
> I think it should be possible to specify the name of the tap interface
> via the "ifname=" parameter, e.g.: -netdev tap,ifname=tap2
>
> In case you already started QEMU without that parameter, you can look 
> up
> the tapX name via the "info network" monitor command.
>
> HTH,
>  Thomas