tcpdump mailing list archives

Re: guessing when TSO is present


From: Guy Harris <guy () alum mit edu>
Date: Fri, 07 Apr 2006 02:18:05 -0700

Hannes Gredler wrote:
checked in - thanks for the submission - /hannes

On Wed, Jan 19, 2005 at 05:35:13PM -0800, Rick Jones wrote:
| A while back I think I posted something asking about what to do about TSO | (large send) and how it generated "IP bad-len 0" output when tracing on a | TSO-enabled sender. | | I had a couple spare cycles, so I decided to just take a WAG at what might | be done, which was to say that if the IP len was zero, just go ahead and | guess that this was a TSO and set the len to the length parm pass-in to | print-ip and hope.

[ ... ] | basically, if the IP len is zero, ass-u-me that the segment is TSO and wing | it. | | rick jones

Should we make that the default, or would that be too risky?

See

        https://sourceforge.net/tracker/index.php?func=detail&aid=1437110&group_id=53066&atid=469573

which I suspect is caused by TSO.
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