In Fast Retransmission, he gets what he asked for. In the example we see that computer 10.0.52.164 sends many Duplicate Acks in which it requests from computer 61.8.0.17: Please send me the TCP Segment with Sequence Number 1731890.
A simple example of this in packet number 5968 which is Retransmission, and if we look at the bottom of the picture it seems that Retransmission is based on the time elapsed from it number 5957.įast Retransmissions – In a situation where there are many Acknowledges (minimum 1 * ACK + 2 * Duplicate ACK) then this is the required dose. Retransmission – For normal mode, where the TCP Segment does not receive Acknowledge at the set time (RTO), then it is retransmitted. There are 3 types of Retransmissions that Wireshark gives an indication of: This article is based on the course: Network Analysis using Wireshark.” In Wireshark, this time can be seen in the _rtt parameter under SEQ / ACK Analysis at the end of the TCP Segment. The time we expect to receive the Acknowledge is called RTO – Retransmission Timer Timeout, and it is calculated (approximately) according to the average time of arrival of the Segments and their approval in the last 4 packets. One of the important mechanisms in TCP is Retransmission, which is a way of TCP to retransmit packets, TCP segments in the language of TCP when we did not receive acknowledgment of them in time.
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