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TCP flow chart: Difference between revisions
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The last column shows the time between ACK packets and the previous data packet this is being acknowledged. | The last column shows the time between ACK packets and the previous data packet this is being acknowledged. | ||
In firmware version 3.6, the packets in the table can be clicked to highlight the time in the graphs at the right hand side. | |||
Buttons on top of the table allow to navigate to the next or previous occurrence of specific unusual TCP events, such as retransmissions, missed data, or duplicate ACKs. | |||
=== Summarized statistics === | === Summarized statistics === | ||
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The maximum time between data and its acknowledgement is shown. Large values indicates network problems when packets may not have been received. | The maximum time between data and its acknowledgement is shown. Large values indicates network problems when packets may not have been received. | ||
The time can be restricted by selected an interval in the graphs below. The selected time period is independent of the global time period. A button on the right hand side part of the view allows to reset the time window back to the whole connection duration, and the second button allows to apply the time period to the global time. This allows to further analyze other network traffic in some selected time period. | |||
=== Traffic graphs === | |||
[[File:Flowchart graphs 1.png|thumb|600x600px|Traffic graphs (part 1)]] | |||
[[File:Flowchart graphs 2.png|thumb|600x600px|Traffic graphs (part 2)]] | |||
In firmware version 3.6, detailed graphs are available for different traffic metrics. The graph can be clicked to jump to the corresponding packet in the packet table, and packets can be clicked too to highlight the graph section with a vertical line. | |||
In contrast to other graphs in the regular live analysis, these graphs are always in millisecond resolution for the whole duration of the connection so no data reduction is used for older data. | |||
* Traffic: this is the graph about the throughput in bit/s and packets/s for the connection. | |||
* TCP zero window packets: this graphs show zero window packets that occurred within the connection. | |||
* DUP acks: this graph contains all occurrences of duplicate acknowledgments. | |||
* TCP retransmission: this graph shows all retransmitted data. | |||
* Client and server sequence/acknowledgment : This graphs shows each individual TCP sequence number and acknowledgment number. This makes it easier to spot large delays in receive acknowledgments, which often happens during time periods with retranmissions. | |||
* Missing data: This graph shows data of TCP segments that have not been seen by the Allegro Network Multimeter. Main reasons for such data are errors in capturing (overloaded capturing), or overloaded or misconfigured mirror ports. | |||
=== Limitations === | === Limitations === | ||