What is the consequence of having a time out value that is too long TCP?

The process is for a packet receipt to be sent by the receiver so the transmitter can then continue to send more. If the timeout is too long the transmitter will have finished transmitting before the receipt arrives, causing pauses. If the timeout is too short then some packets will be retransmitted.

What is TCP retransmission timeout?

TCP starts a retransmission timer when each outbound segment is handed down to IP. If no acknowledgment has been received for the data in a given segment before the timer expires, the segment is retransmitted, up to the TcpMaxDataRetransmissions value. The default value for this parameter is 5.

Why is timeout needed in TCP retransmission control?

An RTO occurs when the sender is missing too many acknowledgments and decides to take a time out and stop sending altogether. After some amount of time, usually at least one second, the sender cautiously starts sending again, testing the waters with just one packet at first, then two packets, and so on.

What is the problem with timeout triggered retransmissions?

The sender sets the timeout period for an ACK. The timeout period can be of two types: Too short: If the timeout period is too short, then the retransmissions will be wasted. Too long: If the timeout period is too long, then there will be an excessive delay when the packet is lost.

Why does TCP retransmission happen?

Common reasons for retransmissions include network congestion where packets are dropped (either a TCP segment is lost on its way to the destination, or the associated ACK is lost on the way back to the sender), tight router QoS rules that give preferential treatment to certain protocols, and TCP segments that arrive …

What happen if RTT value is too high?

“Excessive packet round-trip time (RTT) detected” is a diagnostic that indicates that your network could be duplicating network traffic during busy periods, which in turn can lead to a traffic snowball effect.

Is TCP retransmission bad?

Retransmissions are a sure sign that the self-healing powers of the TCP protocol are working — they are the symptom of a problem, not a problem in themselves. The retransmission rate of traffic from and to the Internet should not exceed 2\%. If the rate is higher, the user experience of your service may be affected.

What causes TCP retransmissions?

What causes TCP retransmission Wireshark?