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Question about the sequence number and next sequence number

asked 2019-05-15 06:19:03 +0000

RoyLiz gravatar image

updated 2019-05-15 06:31:35 +0000

Why the sequence number and next sequence number became to 1? Is it meaning something?

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answered 2019-05-15 06:26:01 +0000

updated 2019-05-15 06:29:52 +0000

If packet's Sequence Number and Next Sequence Number are equal that means the packet contains no data (TCP segment length = 0) in other words this is "pure ACK".

If you see such packet somewhere in the middle of a trace - this is unidirectional data transfer.

Keep in mind also 1 is not absolute Seq.n, but relative. If you want to spot real Seq.n you have to disable Relative Sequence numbers option in TCP dissector.

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Appreciated for your prompt reply!!! :)

RoyLiz gravatar imageRoyLiz ( 2019-05-15 06:48:07 +0000 )edit

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Asked: 2019-05-15 06:19:03 +0000

Seen: 1,298 times

Last updated: May 15 '19