Note that there is a pretty nasty regression in kernel 2.6.32-279.1.1 if you're using bonded network connections with quad port broadcom nics See https://bugzilla.redhat.com/show_bug.cgi?id=834764 It shuts the network off completely. Hopefully it'll get sorted shortly, but in the meantime beware if you have these cards and make sure your console access is working...