What is retransmission timer, Computer Networking

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Q. What is Retransmission timer?

Retransmission timer

if an ACK is received previous to the timer goes off - destroy the timer
if the timer goes off before ACK arrives - retransmit the segment & reset the timer
Retransmission time = 2* RTT

- not fixed because paths that IP packets take may differ

- If too short - retransmissions -> waste of bandwidth

- If too large - delay for the application program

RTT = * previous RTT + (1- ?)*current RTT, usually 90 %

Karn's algorithm:

- don't consider the RTT of a retransmitted segment in the calculation of the new RTT

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