Dom0 does the TCP checksumming, so you do not need to worry - in fact
you should always set this off for DomUs.

Regards,
 Daniel

-----Original Message-----
From: rhelv5-list-bounces@(protected)
[mailto:rhelv5-list-bounces@(protected)
Sent: Monday, February 11, 2008 8:38 PM
To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list
Subject: [rhelv5-list] TCP offloading

Admittedly this is a tad bizarre but....

Dom0 host running RHEL 5.1 fully updated
DomU1 & DomU2 running RHEL 4.6 fully updated.

In doing some testing I noticed that I can't ssh between the 2 DomUs on
the same machine. After a little creative Giggling I found that if I do
the following on the DomUs

ethtool -K eth0 tx off

It fixes the issue. My question is what might break if I keep the TCP
checksumming offloaded?

Ethernet controller: Broadcom Corporation NetXtreme BCM5704 Gigabit
Ethernet (rev 10) on the DomO



Tony Placilla <aplacilla@(protected)>

The Sheridan Libraries
Johns Hopkins University





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