Messages in this thread | | | Date | Wed, 25 Jul 2007 10:12:45 -0700 | From | "Siddharth Taneja" <> | Subject | TCP MD5 and Scatter Gather offloading. |
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Hello,
I am using a vanilla 2.6.22.1 kernel and I see the same kind of problem as had been mentioned some time back on this list
http://lkml.org/lkml/2007/5/22/45
The issue is essentially that with the MD5 option enabled for the specific TCP connection, the SYN and SYN-ACKS are passed fine and the connection establishes fine, but the other end (a cisco router) complains about incorrect MD5 signatures on any other message that is sent after this.
Setting the scatter-gather offloading option on the NIC seems to correct this problem. Recently I had seen a checkin (as a response to the problem mentioned in the above link) where the TSO option was turned off to make MD5 work (my kernel has that fix). Is a similar solution needed here too?
This is the information about my system: > uname -a Linux stdalone 2.6.22.1 #1 SMP Mon Jul 23 20:15:21 PDT 2007 i686 i686 i386 GNU/Linux
> ethtool -i eth0 driver: e1000 version: 7.3.20-k2 firmware-version: N/A bus-info: 0000:01:0a.0
> ethtool -k eth0 Offload parameters for eth0: rx-checksumming: on tx-checksumming: on scatter-gather: off tcp segmentation offload: off
Thanks for your help.
Siddharth
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