![]() Your services need not worry about retransmissions or network congestion. It knows if your service is sleeping, it knows if it’s awake, it knows if the connections run bad or good, so. ![]() ![]() TCP, appropriate to the season, is the Santa Claus of protocols. One of the reasons this protocol stack is still around is that it’s capable of compensating for many errors on its own. Although some alternatives have been developed over the years, TCP/IP still works well and it’s the foundation of almost all networking as we know it today. The TCP/IP protocol suite that we all know so well has been around for almost 40 years now. Meanwhile, other network errors lead to performance problems that negatively affect your services.įollowing is an overview of common network errors and root causes, means and approaches of detecting such errors, and suggestions as to how monitoring tools can support you in staying on top of your services’ connectivity and performance. Some network errors are mitigated and compensated for by network protocols and active networking components, like network interfaces. Figuring out if those errors affect the performance and connectivity of your services is however another matter. Detecting errors like dropped packets or retransmissions on the network level is relatively easy. It means it sends the acknowledgement number as the last highest successfully sent out of order segment value before the first duplicate ack was sent. However receiver does not acknowledge the retransmitted packet, rather does cumulative acknowledgement. If sender receives the duplicate acks, sender immediately sends the lost packet based on acknowledgement number and doesn't send any application data in the send buffer until the lost packet is sent. This approach is sending cumulative acknowledgements instead of sending ack to every segment. However if no packet loss was found, ack is delayed hoping that to acknowledge the back to back segments and reduce the number of acks in network. If the sender receivers duplicate packets greater than 3 then it will retransmit the packet.ĭuplicate packets are send immediately by receiver if out of order segments are arrived. Hence tcp implemented duplicate acks and the sole purpose of it is to intimate the sender before timeout occurs. Retransmission of the same packet is ,time consuming due to increased timeout and the sender need to wait for longer time thus causing delay. However timeout increases exponentially assuming packet is lost every time it sends. Generally, if tcp timer expires, it is assumed that the packet is lost and tcp retransmits the same packet.īut it need to wait, until the timer expires.Īs a part of congestion control techniques, TCP behaves very politely during the times of congestion by increasing the timer interval by 2 times, so that the packet would be retransmitted slowing, thus not contributing to congestion. TCP now uses duplicate acks as well as timeout to retransmit a packet if lost.ĭuplicate acks are used as a part of fast retransmission and packet recovery. RDT protocol was the basis for the implementation of TCP protocol.RDT protocol use to retransmit the packet only when timer expires.
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