Glad I nudged you in a helpful direction.
I did not pay attention to the mention of Ubuntu.
I zeroed in on "eth0" and "kickstart" and shared the answer that I use on Red 
Hat systems. 

But the common answer is to set a kernel option, so there you go.

Enjoy

On Dec 5, 2012, at 5:08 PM, Asher Newcomer wrote:

> Hi Dan,
> 
> Thanks for responding. I think that your kernel option is similar to 
> 'netcfg/choose_interface', and in any case on my system was set to 
> ksdevice: bootif
> 
> That was actually a nice pointer, because the solution seems to be setting 
> kernel option BOOTIF=<mac> and leaving netcfg/choose_interface=auto, rather 
> than assigning it as I had been. So far, that seems to be working with the 
> few permutations I've tested.
> 
> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=615600
> 
> Thanks,
> 
> Asher
> 
> 
> On Wed, Dec 5, 2012 at 10:47 AM, Dan White <y...@comcast.net> wrote:
> In /etc/cobbler/settings:
> 
> kernel_options:
>     ksdevice: eth0
> 
> or whichever one you want to use.
> 
> “Sometimes I think the surest sign that intelligent life exists elsewhere in 
> the universe is that none of it has tried to contact us.”
> Bill Waterson (Calvin & Hobbes)
> 
> ----- Original Message -----
> From: "Asher Newcomer" <asher...@gmail.com>
> To: "cobbler mailing list" <cobbler@lists.fedorahosted.org>
> Sent: Wednesday, December 5, 2012 9:51:16 AM
> Subject: [cobbler] Setting PXE interface to eth0
> 
> 
> Hi All,
> 
> 
> I have a machine with multiple nics, and the nic that is being used to boot 
> from pxe ends up getting set as eth2 by Ubuntu 12.04 after install.
> 
> 
> This causes some problems for mac address mappings and some other assumptions 
> I've made. Is there a simple way to set the pxe interface to eth0 by default? 
> I'm unfortunately using preseed files instead of kickstarts to drive the 
> installer, but I suppose I could look to change that.
> 
> 
> Thanks!
> 
> 
> Asher
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