Subject: Problems with TCP and UDP checksum offload
To: None <>
From: Matthias Scheler <>
List: current-users
Date: 06/26/2006 09:01:00

I've got problems with TCP and UDP checksum offload on my NetBSD-current
system. If I enable anything other IPv4 checksum offload (e.g. "tcp4csum")
I can now longer "traceroute6" the box. It looks like the network stack is
rejecting the incoming UDP packets in that case.

Because support for the Intel i82573L chip I'm using ...

wm0 at pci3 dev 0 function 0: Intel i82573L Gigabit Ethernet, rev. 0
wm0: interrupting at ioapic0 pin 17 (irq 10)
wm0: PCI-Express bus
wm0: 256 word (8 address bits) SPI EEPROM
wm0: Ethernet address 00:15:f2:5a:cc:f5
makphy0 at wm0 phy 1: Marvell 88E1111 Gigabit PHY, rev. 2

... has only been added recently I'm not sure whether this is a problem
with the driver or the network stack.

Is anybody else using TCP or UDP checksum offload successful under
NetBSD-current on a box which also uses IPv6?

	Kind regards

Matthias Scheler