TCP retransmissions and duplicate ACKs are the tactics that are used while recovering from a failed packet transmission or an out-of-order packets transmission scenario. Commonly, network latencies (the total time it takes for a packet to be sent along with the time its ACK is received) are observed, due to which the performance of networks are significantly disturbed. When the amount of retransmissions and duplicate ACK packets are seen very often in the list pane, most probably, there is a chance that your network is facing high latencies; if not, then just sit back and relax. My point is that you should be concerned about such activities, and if possible, mix some network management techniques with your protocol analysis that can keep you updated all the time with what's happening inside

The devices use TCP retransmission in order to send data reliably. Values such as RTT and RTO are maintained by the sender of the data in order to facilitate a reliable form of communication...