![]() ![]() ![]() (3) the receiver notifying the sender that expected data hasn’t been received, and (2) the sender discovering that transmission was unsuccessful (usually through out of band means), (1) the lack of an acknowledgement that data has been received within a reasonable time, There are four common reasons for packet retransmission: This actually happens all the time, and typically doesn't cause much of a problem: as the retransmission timer counts down, the packets are resent, and the network continues to run along. When an outbound segment is handed down to an IP and there's no acknowledgment for the data before TCP's automatic timer expires, the segment is retransmitted. This usually shows up as slow application performance and/or packet loss to the user. A few retransmissions are OK, excessive retransmissions are bad. – Displays all retransmissions in the capture.Packet loss can lead to duplicate ACKs, which leads to retransmissions. _segment – Indicates we’ve seen a gap in sequence numbers in the capture. ![]()
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