It's ok. Problem solved. The mac addresses were being remembered in udev rules 
by Slackware and because I got a different address each time, the eth device 
number was being incremented. With a fixed mac address on the eth0= startup 
parameter and a reset of the udev rules it now works.

Dave.

On Wednesday 17 October 2007 10:44 pm David Houlden wrote:
> Hi,
>
> I'm running a 2.6.22.10 host with 2.6.23 guest. Both are Slackware. I'm
> trying to use udev in the guest and it works apart from the fact I can't
> get networking to work in the guest. I'm using tun/tap with the uml_net
> helper but I get the same problem if I do the set up of the tap0 device
> myself using tunctl.
>
> If I don't use udev in the guest, I start the guest with
> eth0=tuntap,,,192.168.1.50 and in the guest eth0 comes up with its assigned
> ip of 192.168.1.51.
>
> Using udev, the tap0 interface doesn't come up on the host and in the guest
> I get device not found from "ifconfig eth0 192.168.1.51 up". What I have
> found is that in /proc/net/dev on the guest I have a device eth17. Next
> time I boot the guest it will be eth18 and so on.
>
> Any ideas why this happens and what I can do to fix it.
>
> Thanks,
> Dave.

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