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Path measurement: Difference between revisions
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The path measurement module allows to passively measure the packet loss and latency between two Allegro Network Multimeter installations. | The path measurement module allows to passively measure the packet loss and latency between two Allegro Network Multimeter installations. | ||
For example, a network connection (line/link) between the main office and a remote office can be analyzed by installing one Multimeter at the main office and another Multimeter at the remote office. | For example, a network connection (line/link) between the main office and a remote office can be analyzed by installing one Allegro Network Multimeter at the main office and another Allegro Network Multimeter at the remote office. | ||
Only network traffic (packets) passing through both Multimeters can be analyzed. The packet loss and two-way-latency thereof is measured and shown in graphs. | Only network traffic (packets) passing through both Allegro Network Multimeters can be analyzed. The packet loss and two-way-latency thereof is measured and shown in graphs. | ||
The time synchronization setting (e.g. NTP/PTP or OFF) should be the same on both devices for the best results. | The time synchronization setting (e.g. NTP/PTP or OFF) should be the same on both devices for the best results. | ||
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#System capture overload: If multiple captures are running in parallel, the CPU might be overloaded. Check the '''All''' tab in the Capture page to see how many captures are running. In best case there is only the one capturing connection to the main device. | #System capture overload: If multiple captures are running in parallel, the CPU might be overloaded. Check the '''All''' tab in the Capture page to see how many captures are running. In best case there is only the one capturing connection to the main device. | ||
#The capturing connection is encrypted with SSL. The small Allegro 200 has a limited encryption capacity so for large traffic this can be a bottleneck. The only solution is to use a more powerful Multimeter. | #The capturing connection is encrypted with SSL. The small Allegro 200 has a limited encryption capacity so for large traffic this can be a bottleneck. The only solution is to use a more powerful Allegro Network Multimeter. | ||
#Capture drops can also occur if the network connection is not capable of transferring the data fast enough. Rule of thumb is that approximately 5% of the total traffic is used for the measurement connection. For example, if the traffic is 500 MBit/s, the measurement requires ~25 MBit/s of bandwidth on the management port. | #Capture drops can also occur if the network connection is not capable of transferring the data fast enough. Rule of thumb is that approximately 5% of the total traffic is used for the measurement connection. For example, if the traffic is 500 MBit/s, the measurement requires ~25 MBit/s of bandwidth on the management port. | ||