[CentOS] How to specify the default route?

Mon Jun 21 23:57:13 UTC 2010
Rick Thomas <rbthomas at pobox.com>

I have a machine with two net interfaces.

it seems to always pick the wrong one (eth1) as the default route.

I can change it with

	route del default
	route add default eth0

after it's up (or in rc.local, of course), but I'd like to figure out  
what I need to do this "the CentOS way" (e.g. edit some configuration  
file? Run some config utility, what?) once and for all.

Can somebody point me to the canonical documentation on the subject?   
I've searched /usr/share/doc and the man pages, but I can't find  
anything useful.

Googling for "default route centos" gives some interesting stuff, but  
nothing definitive.

Thanks!

Rick