![]() ![]() These are called fast retransmissions.Ĭonnections with more latency between client and server will typically have more duplicate acknowledgement packets when a segment is lost. In most cases, once the sender receives three duplicate acknowledgments, it will immediately retransmit the missing packet instead of waiting for a timer to expire. ![]() They are a common symptom of packet loss. ![]() Typically, duplicate acknowledgements mean that one or more packets has been lost in the stream and the connection is attempting to recover. Most packet analyzers will indicate a duplicate acknowledgment condition when two ACK packets are detected with the same ACK numbers. If you want to filter on TCP transmissions use this wireshark filter: Above you can see that after more than 1s a frame get’s sent again. ![]()
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