I'm confused. I just rebooted another machine with 'BOOTPROTO=bootp' in /etc/sysconfig/network-scripts/ifup-eth, it did not rewrite /etc/resolv.conf.

Okay, my goof, the one with the problem is actually running fc9. Sorry.

I will try

 sed -i "s/BOOTPROTO=bootp/BOOTPROTO=none/" /etc/sysconfig/network-scripts/ifup-eth

mahalo,
Dave