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Path measurement: Difference between revisions
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replace version 3.7 with 4.0
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In Firmware version >= 3.3, it is also possible to use a single device to measure the traffic delay/losses between two different [[Virtual Link Group functionality|virtual link groups]]. In this mode, the primary device is used as a client too. | In Firmware version >= 3.3, it is also possible to use a single device to measure the traffic delay/losses between two different [[Virtual Link Group functionality|virtual link groups]]. In this mode, the primary device is used as a client too. | ||
In Firmware version >= | In Firmware version >= 4.0, two pcap capture files can be compared to do an offline path measurement with previously captured files in two different locations. | ||
=== Live analysis === | === Live analysis === | ||
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[[File:Path-measurement-pcap-settings.png|border|660x660px]] | [[File:Path-measurement-pcap-settings.png|border|660x660px]] | ||
Since firmware version | Since firmware version 4.0, the path measurement can also be done based on two capture files created from two different network locations. The separate configuration tab "Configuration PCAP Analysis" allows to select two files from attached storage devices. | ||
The files are replayed based on the packet time stamps within each file, in chronological order. Matching packets are only recognized if they are within the maximum packet delay. If the difference of the timestamps is larger, a time-delta adjustment value can be entered which will be added to the timestamp of the client packets. Negative values are possible as well to be able to adjust the time in both directions. If the time difference is too large, a lot of packet loss are reported, or even a "network setup problem" note is shown in the overview tab. If the time delta between both files is not known, a test run can be enabled to calculate the approximate difference. When both files are fully processed in this test run, the result is shown in the overview tab and this value can be used for the actual analysis. | The files are replayed based on the packet time stamps within each file, in chronological order. Matching packets are only recognized if they are within the maximum packet delay. If the difference of the timestamps is larger, a time-delta adjustment value can be entered which will be added to the timestamp of the client packets. Negative values are possible as well to be able to adjust the time in both directions. If the time difference is too large, a lot of packet loss are reported, or even a "network setup problem" note is shown in the overview tab. If the time delta between both files is not known, a test run can be enabled to calculate the approximate difference. When both files are fully processed in this test run, the result is shown in the overview tab and this value can be used for the actual analysis. | ||