It's getting set from /etc/sysconfig/network-scripts/ifup-eth, line 285 and following - although I haven't traced out the logic it's using to begin to say why it's coming to the wrong conclusion in your case.
Whit
On Mon, Jun 21, 2010 at 07:57:13PM -0400, Rick Thomas wrote:
I have a machine with two net interfaces.
it seems to always pick the wrong one (eth1) as the default route.