Tcp dupack hang vista

This event is a good indicator of packet loss and will likely be accompanied by "TCP Retransmission" events. TCP Keep-Alive - Occurs when the sequence number is equal to the last byte of data in the previous packet. Used to elicit an ACK from the receiver. ACK packet sent in response to a "keep-alive" packet. If the receiver detects a gap in the sequence numbers, it will generate a duplicate ACK for each subsequent packet it receives on that connection, until the missing packet is successfully received retransmitted.

This effectively tells the sender to stop sending because the receiver's buffer is full. Indicates a resource issue on the receiver, as the application is not retrieving data from the TCP buffer in a timely manner. TCP ZerowindowProbe - The sender is testing to see if the receiver's zero window condition still exists by sending the next byte of data to elicit an ACK from the receiver.

If the window is still zero, the sender will double his persist timer before probing again. TCP ZeroWindowViolation - The sender has ignored the zero window condition of the receiver and sent additional bytes of data.

A WindowUpdate occurs when the application on the receiving side has consumed already received data from the RX buffer causing the TCP layer to send a WindowUpdate to the other side to indicate that there is now more space available in the buffer. Recommend to a Librarian Recommend to a Colleague. Looking for research materials? Blockchain Technology for Global Social Chan Emerging technologies continue to affect a variety In Stock.

Encyclopedia of Information Science and Tech Information acquisition and management has always Churn prediction, recognition, and mitigation have Simultaneous Localization and Mapping for Mo This approach is sending cumulative acknowledgements instead of sending ack to every segment.

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. However receiver does not acknowledge the retransmitted packet, rather does cumulative acknowledgement.

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. It is assumed that if there is just a reordering of the segments, there will be only one or two duplicate ACKs before the reordered segment is processed, which will then generate a new ACK. If three or more duplicate ACKs are received in a row, it is a strong indication that a segment has been lost. For more info www. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. What is duplicate ACK when does it occur? Ask Question. Asked 4 years ago. Active 3 years, 1 month ago. Viewed 59k times. Improve this question. Mike 3, 4 4 gold badges 17 17 silver badges 33 33 bronze badges. Add a comment. Active Oldest Votes.