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ACK    音标拼音: ['æk]
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1. /ak/ The {mnemonic} for the ACKnowledge
character, {ASCII} code 6.

2. A message transmitted to indicate that
some data has been received correctly. Typically, if the
sender does not receive the ACK message after some
predetermined time, or receives a {NAK}, the original data
will be sent again.

[{Jargon File}]

(1997-01-07)


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  • Why is the last ACK needed in TCP four way termination
    As a side note, this also implies A needs to "stay here" after it has sent its ACK to B's FIN: when B retransmits the FIN, if A's gone, B won't get any ACK (and possibly a RST) and so cannot guarantee A knows it has received all data A stays some time in the TIME_WAIT state to ACK such retransmitted FINs
  • NACK vs. ACK? When to use one over the other one?
    For instance, segments with only the ACK or RST flag set do not require an ACK Additionally, if delayed ACKs are in use, then there may not be an ACK every segment, however generally this requires that an ACK be sent for every other segment Yet many TCP connections will not use delayed ACKs and will send an ACK for every segment carrying data
  • Why do I see a RST, ACK packet instead of a RST packet?
    SYN --> <-- SYN ACK ACK --> In the case of a RST ACK, The device is acknowledging whatever data was sent in the previous packet(s) in the sequence with an ACK and then notifying the sender that the connection has closed with the RST The device is simply combining the two packets into one, just like a SYN ACK
  • Window Size and ACK Number - Network Engineering Stack Exchange
    Each ACK allows the sender to again send two new segments, before the Window is full again, and the Server is again forced to pause This happens up until Packet# 51, when the Client (Recever) increases the Window Size significantly, allowing the Server (sender) to start transmitting data uninhibited again at least until Packet #175, when
  • Why is TCP acknowledging all the time?
    There is a zero in the ACKnowledgement field, but it is just a placeholder (some decoders show it some don't, but you can see it in the hex) Every packet after the first packet will have the ACK bit set Every packet has a SEQ and ACK number, so there is always a valid ACK, even if the ACK was the same as the last ACK
  • TCP Handshaking Meaning of RST - networking
    I am setting up the enc28j60 ethernet controller as a server, and have script to serve as the client I try to send a SYN,ACK packet from the enc28j60 (an ethernet controller) with my own TCP IP stack in response to the SYN from the client, but I always receive RST instead of ACK The checksum in my SYN,ACK is correct according to Wireshark
  • TCP Fast Retransmit and duplicated acknowledgements Ask
    Or better yet, do an upload, and you can see your client doing a Fast Retransmit after it sees 3 identical ACK's You can also look closer at the TCP options and see the SACK's that manbearpig alluded to Another good source of info about fast-retransmits is the RFC The second paragraph answers your comment about why 3 ACK's vs 1,2,4,5
  • TCP acknowledgment payload - Network Engineering Stack Exchange
    In TCP IP communication, we know that when a sender sends a packet containing some data, the receiver has to return an ACK packet Does this ACK packet has to carry the same payload that the receiver got or it is just turning on ACK flag in the header and the next serial number?
  • The reason why TCP sends consecutive ACKs all together
    The key here is understanding that just because an ack is sent for every packet (or, more commonly today, every other packet due to delayed ack) doesn't mean that the the sender has to wait for each ack to send the next packet This is a common misconception that is repeated in a lot of circles
  • TCP errors explain - Network Engineering Stack Exchange
    TCP Dup ACK answered here TCP Previous segment not captured If packet N is marked with previous segment not captured, it means that in the capture there is no packet from the same TCP session whose seq + length would match the seq of packet N





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