[CentOS] kickstart, no dhcp reply received.

I'm trying to kicktart a CentOS 4.3 x86_64. However, anaconda is unabled to do dhcp, complaining about"no DHCP reply received". While tailing the log on the dhcp server, I clearly see a request come in and address is offered. This same machine kicks fine with CentOS 4.1 (32-bit). Since anaconda could potentially use a different NIC (this system contains 2 NICSs), I've tried plugging both interfaces into the kickstart network (I've seen interfaces swapped before) as a test.

I know that the CentOS 4.3 x64 setup I have works fine because I can kick a different hardware with it.

Any idea what else to check for? Could it be that the e1000 driver in CentOS 4.3 x64 is older than the CentOS 4.1 driver?

Any help is appreciated.