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https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5770

--- Comment #17 from Stephen Fisher <steve@xxxxxxxxxxxxxxxxxx> 2011-03-22 15:24:04 MDT ---
I just learned something new about icmp packets, at least from a FreeBSD Unix
box.  The first part of the payload is a tv32 timestamp:

struct tv32 {
        int32_t tv32_sec;
        int32_t tv32_usec;
};

And if you specify the payload to be too small (-s parameter to ping), then it
no longer tracks response time!  Not sure if this would be useful to show in
Wireshark, but here is a link to the source code (look for the pinger
function);

http://svn.freebsd.org/viewvc/base/head/sbin/ping/ping.c?view=markup

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