On Thu, 27 Mar 2008 14:51:24 +0000
"Will Morton" <[EMAIL PROTECTED]> wrote:
> Greetings UMLers;
>
> I am booting a custom 2.6.24.4 UML kernel, running a debian etch guest
> created using debootstrap. I am booting using the kernel command
> line:
>
> root=/dev/ubda ubd0=./etch.rootfs ubd1=./etch.swapfs mem=128M
> eth0=tuntap,,,192.168.23.5
>
> However, the network interface that gets created isn't eth0 - it's
> ethN, where N increments every time I boot the guest (I'm now on
> eth19). This prevents the normal boot-time network config from
> running properly. Now I can bugger about with a custom script that
> uses something like ifconfig `ifconfig -a | grep eth | awk '{print
> $1}'` ... but it seems there must be a better way, and in any case I
> want to use more than one network device on some of my guests.
>
> I'm not sure what's causing this, but I notice this line in dmesg:
>
> [42949373.660000] Choosing a random ethernet address for device eth0
>
> If it's picking a different mac address each boot, does this result in
> the kernel thinking it's a different device and hence assigning it a
> different name? How do I stop it doing this?
>
> Cheers,
>
> W
[Debian-specific information follows]:
The simplest way to deal with this is to remove the following files (or
otherwise prevent udev from reading them, particularly the z45* link):
/etc/udev/rules.d/z25_persistent-net.rules
/etc/udev/rules.d/z45_persistent-net-generator.rules
The generator config file creates the z25 file for use at the next
boot, writing a per-interface entry using the MAC address. This is, by
default, pretty useless for a UML guest with dynamic MAC addressing, so
it's easiest to simply disable this functionality and let your
command-line interface specifications be properly used. Please note
that it should go without saying that this change is intended for your
UML guest(s), not the host.
Regards,
Adam Snodgrass
[EMAIL PROTECTED]
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