![]() Note that this is not the same as the next expected acknowledgment number. ![]() Note that this is not the same as the next expected acknowledgment number.Īlways updated for each packet. ![]() Set when there are no analysis flags and for zero window probes.Īlways set. The last-seen sequence number for segments. Note that this may not be the same as the tcp.nxtseq protocol field. This is initially zero and calculated based on the previous packet in the same TCP flow. Set when there are no analysis flags and for zero window probes. The last-seen sequence number plus segment length. Terms such as “next expected sequence number” and “next expected acknowledgement number” refer to the following”: TCP Analysis flags are added to the TCP protocol tree under “SEQ/ACK analysis”. You can enable or disable this feature via the “Analyze TCP sequence numbers” TCP dissector preference.įor analysis of data or protocols layered on top of TCP (such as HTTP), see Section 7.8.3, “TCP Reassembly”.įigure 7.6. Packets are processed in the order in which they appear in the packet list. ![]() Analysis is done once for each TCP packet when a capture file is first opened. By default, Wireshark’s TCP dissector tracks the state of each TCP session and provides additional information when problems or potential problems are detected. ![]()
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