TCP Fast Retransmission

10 pts.
Tags:
ACK
TCP
From what I have read TCP Fast Retransmission is meant to occur if 3 or more duplicate ACKs are recieved in a row. However I have a trace file where Fast retransmission is occuring after only 2 duplicate ACKs.

Can anyone explain this for me please? Why is there a variation in the number of duplicate ACKs it takes before Fast Retransmission occurs?

I am using a trace file in wireshark. Many thanks.



Software/Hardware used:
Wireshark

Answer Wiki

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Count the first ACK as part of the series. It would not be labeled as a DUP ACK. So, if you are seeing 2 packets marked as duplicate ACKs that means that one ACK had already been received.

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