5/7/2023 0 Comments Tcp dup ack wiresharkHaving SACK permitted can help improve the performance as the server doesn't have the retransmit all the packets again, from the point when a packet went missing. If it has value SACK permitted then that device allows selective acknowledgment. SACK is the method of resending only the necessary packets that never reached the receiver and hence help eliminate the redundant traffic. This is prone to cause unnecessary retransmission of data, which can exacerbate a congestion condition. The default TCP behavior is to send all the packets again after the original packet was lost. If either one has a smaller value then the smaller MSS size will be used in the rest of the TCP session.
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