Why need Ack flag if we already have ack number in TCP
Mar 19, 2022 · The ACK flag indicates that the Acknowledgment Number field is significant, ie. containing a meaningful value. When a socket connection has already been established that is …
Why do I see a RST, ACK packet instead of a RST packet?
Why do you think there should be a RST segment before RST/ACK? Maybe you could provide an example of such a packet trace?
Window Size and ACK Number - Network Engineering Stack Exchange
Copy-pasting from my lecturer's slides: • Receiver indicates the window size is 3000 • Transfer goes ahead • Acknowledge every 3000 bytes • Receiver increases window size to 4000 • 4000 bytes ...
Wireshark filter for specific SYN packet which never received a SYN/ACK
Nov 17, 2023 · Is there a way in wireshark to find out a single SYN that does not get answered by SYN/ACK?
NACK vs. ACK? When to use one over the other one?
Jan 12, 2016 · 24 Personally I don't even feel that there is a need for ACK. It's faster if we just send NACK (n) for the lost packets instead of sending an ACK for each received packet. So when/which …
Why is TCP acknowledging all the time?
Jan 7, 2018 · I understand seq/ack is used to provide a reliable connection service. But it seems that during TCP data transmission the ACK bit is ALWAYS set, as demonstrated in the following picture. …
TCP Duplicate Acknowledgement - Network Engineering Stack Exchange
Dec 10, 2023 · Then the receiver will sending an duplicate ACK to sender, so whenever sender receive 3 duplicate ACK then the sender will retransmit the loss segment. But in this case where segment …
tcp - what's the acknowledgement number after retransmitting the ...
Aug 17, 2020 · The very first ACK is correct. The acknowledgement number is the next expected segment number, and it acknowledges everything prior to that segment number, so the diagram is …
TCP ACK confusion - Network Engineering Stack Exchange
Apr 8, 2021 · The receiver can also selectively ACK (SACK) 51-100 to avoid a retransmission of successfully received segments. Without selective ACK, the sender retransmits 50-100. Note that …
Why is the last ACK needed in TCP four way termination
The question of why the last ACK is required is just that nay FIN only means that the sender of the FIN is done sending, and it must still be open to receive more segments, and it must resend any …