[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