gigabit bonding

hi -

I have 2 dell power edge 6300 boxes, each with 4 processors and 2 intel 717037 ethernet cards running rh 6.2, kernel 2.2.14-6.1.1smp. I have installed the latest intel nic driver that I could find - v3.0.7. The machines are identical except for the scsi controllers.

On one machine, I could bond the cards to one ip and all was well - on the other, the cards worked if brought up singly, but bonding never set the mac of the 2nd card to that of the 1st, although ifenslave doesn't report errors. I can change the mac with ifconfig and the card(s) work fine.

I tried swapping the 2 pairs of cards from one machine to the other - now neither pair will bond, although all 4 still work singly.

Any guesses as to where I can go next?

john