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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.
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.