Hi, Here is our situation. We are running hp zx6000's with the latest kernel release for the ia64(2.4.20 w/febuary patches). We have broadcom cards onboard. We have a foundry switch that is capable of doing jumbo frames...and jumbo frames are turned on in the switch configuration. Now my problem. Using mtu's of 1500 on two linux boxes connected through the switch, we can nfs mount each other and read and write to each other. We move both linux machines over to mtu's of 9000 and then remount the directories, but the machine that we are writing from or reading to will just die...ie its network port freezes. At first glance it looks like the switch is the cause of issue, but we've had the network technician from foundry verify that the jumbo frames are configured correctly and he's saying it's linux. I'm at wits end here. Does anyone else have experience running linux boxes with jumbo frames through a foundry switch? What should I set my linux boxes too? What do you guys recommend in general? Could this be an autonegotiation issue? Thanks, Brent Clements - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html