eth assignments question

[Guillermo Garron]

On 8/23/06, Peter Hovorka <peter at fusselt.net> wrote:
> Hi there,
>
> I recently tried to use a ubuntu installation on user mode linux and I
> ran into a strange problem.
>
> Normally, an assignment of
>
> ./vmlinux eth0=tuntap,tap1
>
> results in eth0 set up inside the UML instance according to the
> assignment of tap1. This setup works with several distributions like
> debian sarge, fedora core 5 etc.
>
> Ubuntu changes the assignment to eth2 - which would be the next free eth
> number on the host server.
I recently start using Ubuntu, actually I use Ubuntu at my Office, FC5
on my Home Desktop and Centos on my laptop :)
I could see that with ubuntu the eth0 becomes eth1 and the eth1
becomes eth0 comparing with FC5 or Centos.

>
> It looks like the uml client assigning eth numbers whilst knowing about
> the hosts eth interfaces and incrementing the eth number for a free
> one.
>
> Can anyone point to the cause of this behaviour, it must be something in
> Ubuntu Dapper that causes this because it works with all other
> distributions I tried.
>
> Remarks:
> - The problem does not occur with kernels numbered 2.6.14 or lower
> - The user mode linux team hasn't changed anything in this regard in the
> last few months
>
> Kind regards,
> Peter
>
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