![]() This can be caused by many things: packet errors, excessive buffering, and traffic bursts. If retransmissions are detected in a TCP connection, it is logical to assume that packet loss has occurred. This duplicate ACK should not be delayed. The TCP retransmission mechanism ensures that data is reliably sent from end to end. That one reason for doing so was for the experimental fast. Of-order segment is received (Section 4.2.2.21 of, with a note TCP Retransmissions This is indicated on the sequence number field of the TCP header. Generate an immediate acknowledgment (a duplicate ACK) when an out. Before describing the change, realize that TCP may Modifications to the congestion avoidance algorithm were proposed The second paragraph answers your comment about why 3 ACK's vs 1,2,4,5. You can also look closer at the TCP options and see the SACK's that manbearpig alluded to.Īnother good source of info about fast-retransmits is the RFC. ![]() Or better yet, do an upload, and you can see your client doing a Fast Retransmit after it sees 3 identical ACK's. Generally you will see some packet loss over an internet connection, and you can dig into this further on your own to see your own client sending DUP ACK's for lost packets. ![]() ![]() properly in Reno so the fast retransmitted packets also starts dropping at. Your best way to understand TCP is to open up Wireshark, download a large file using HTTP, or any TCP protocol, and look for BLACK lines saying DUP ACK, Fast Retransmit, or Retransmit to scroll across your screen. TCP is a reliable protocol which is capable of handling retransmission and. ![]()
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