Modify MTU?

[wills]

Thanks! I'm using Broadcom 5708 and 5709 NIC on all servers as well as managed GIG switches. It is supported

[adamvh]

I've tried setting the MTU to 9000 but it always says 'wrong size frame'

[symm]

check the card specs for max frame size

try a smaller frame size

[adamvh]

Yes the network controller chipset defiantly supports jumbo frames.
If the links are not bonded enabling jumbo frames on eth0/eth1 works.

eth0: Tigon3 [partno(BCM95721) rev 4201 PHY(5750)] (PCI Express) 10/100/1000Base-T Ethernet 00:25:64:3b:99:03