This is interesting.  I upgraded a box to Debian's 2.6.16-2-686-smp [2.6.16-17] from 2.6.12-1-686-smp, and find out NIC bonding doesn't work.  With Debian's ifenslave package (version 2), I get:

# ifup bond0
SIOCBONDENSLAVE: Operation not permitted.

The bond0 interface is setup, yet passes no traffic.  However, if I build the 1.x version of ifenslave I got from here, it works fine.

Also to note, I have another box with the same kernel, ifenslave version, and NIC models, and it works fine.  I'm passing mode=1 miimon=100 to the bonding module, since this is just for redundancy.  lspci output is:

01:02.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5703X Gigabit Ethernet (rev 02)
04:02.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5703X Gigabit Ethernet (rev 02)

... all using the tg3 driver.

Weird, huh?

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