tcpdump mailing list archives

Re: Odd behaviour under Linux 2.6.21


From: James Healy <jhealy () swin edu au>
Date: Fri, 06 Jul 2007 15:44:01 +1000

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James Healy wrote:
We've encountered some odd behaviour with tcpdump/libpcap under Linux
2.6.21 (debian etch) and are hoping that others might be able to shed
some light on it for us.

I've got some more information on this:

I ran the same test under various Linux kernels (using standard Debian
kernel packages), always with the same hardware setup and tcpdump 3.9.5
/ libpcap 0.9.5.

The sending host was running Linux, and the receiving host FreeBSD 6.2.
However we've seen the same behaviour on Linux to Linux transfers.

The following list indicates the kernels under which I observed the odd
behaviour:

2.6.12 - No
2.6.15 - No
2.6.16 - No
2.6.17 - Yes
2.6.18 - Yes
2.6.21 - Yes

So, the next question is, what changed between kernels 2.6.16 and 2.6.17?

James
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