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Practical Packet Analysis, 2nd Edition by Chris Sanders

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Learning from TCP Error-Control and Flow-Control Packets

Let’s put retransmission, duplicate ACKs, and the sliding-window mechanism into some context. Here are a few notes to keep in mind when troubleshooting latency issues:

Retransmission packets

Retransmissions occur because the client has detected that the server is not receiving the data it’s sending. Therefore, depending on the side of the communication you are analyzing, you may never see retransmissions. If you are capturing data from the server, and it is truly not receiving the packets being sent and retransmitted from the client, you may be left in the dark because you won’t see the retransmission packets. If you suspect that you are the victim of packet loss on the server side, consider ...

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