I've noticed that over a long-duration two-2ay ping between two windows machines, the sequence numbers embedded in the pings ICMP packets synchronize. Is this expected and, if so, does anybody know why this is done?
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What do you mean by this ? Perhaps show us an example. – nos Jun 13 '13 at 20:41
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Host a is pinging host b, and simultaneously, host b is pinging host a. Using Wireshark, I see that the a-to-b and b-to-a ping packets start out with different sequence numbers. However, over time, these sequence numbers converge. This is occurring on Windows XP. – Dave Jun 13 '13 at 21:15
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Is this expected
No. Just a fluke, or a consequence of how the sequence numbers are constructed.
and, if so, does anybody know why this is done?
It isn't done at all. The ping at one end doesn't know what sequence numbers a ping at the other end is using. It doesn't even see them.
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