You need a tun(4) device per qemu '-net tap' argument, sometimes multiple per
qemu instance, sometimes none per qemu instance..

Thanks,

Penned by Rogier Krieger on 20100202 16:51.31, we have:
| On Tue, Feb 2, 2010 at 15:27, Matthias Pfeifer <[email protected]> wrote:
| >  [...] Then the second:
| <snip>
| >  this gives me a " cannot create /dev/tun0: Device busy "
| 
| If I'm not mistaken, you need separate tun(4) devices per qemu
| instance. The reason for that lies in the device being ready for
| simultaneous use only by a single process.
| 
| To quote tun(4):
|      Each device has the exclusive open property; it cannot be opened if it is
|      already open and in use by another process.
| 
| If I misunderstood, feel free to correct me.
| 
| Regards,
| 
| Rogier

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