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Bandwidth unit and measurement

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The value of "Traffic In" and "Traffic Out" represents the up and down bandwidth? how can I get the upload and download speed?

bandwidth-used prtg traffic

Created on Sep 18, 2017 9:59:58 PM by  Fernando Díaz (0) 1

Last change on Nov 1, 2017 9:01:20 AM by  Luciano Lingnau [Paessler Support]



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This is the description of the values polled by the Traffic In and Traffic Out channels from the SNMP Traffic sensor:

Traffic In
The total number of octets received on the interface, including framing characters.
Traffic Out
The total number of octets transmitted out of the interface, including framing characters.

The sensor will measure the difference of the counters between scans and display values in kilobit/second.

If you want to check the interface's speed, you could deploy a custom sensor to monitor the Interface's speed:

ifSpeed(1.3.6.1.2.1.2.2.1.5.ifIndex)
An estimate of the interface's current bandwidth in bits per second. For interfaces which do not vary in bandwidth or for those where no accurate estimation can be made, this object should contain the nominal bandwidth. If the bandwidth of the interface is greater than the maximum value reportable by this object then this object should report its maximum value (4,294,967,295) and ifHighSpeed must be used to report the interace's speed. For a sub-layer which has no concept of bandwidth, this object should be zero.

Best Regards,
Luciano Lingnau [Paessler Support]

Created on Sep 19, 2017 10:47:39 AM by  Luciano Lingnau [Paessler Support]



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Thanks for answering. I have a router and I want to know the upload and download speed of the interface connected to the Internet. Can I do it with SNMP?

Created on Sep 19, 2017 2:10:35 PM by  Fernando Díaz (0) 1



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Hi there,

Please note that the SNMP Sensor will only monitor the current bandwidth (speed) of the incoming and outgoing traffic. It can't monitor the maximum available download/upload speed. This would require constant down-/uploads to see what the available down-/upload speeds are.

Best regards.

Created on Sep 20, 2017 10:41:40 AM by  Dariusz Gorka [Paessler Support]



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how the SNMP Traffic sensor works? How does the sensor measure? How long is the measurement?

Created on Sep 21, 2017 8:05:42 PM by  Fernando Díaz (0) 1



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Hi there

The sensor queries the device via SNMP for its newest traffic counters which are in most cases given in Byte. PRTG will then calculate the difference between the query now and the next query. This will result in the size that went through (e.g. 100 KByte) and the speed (60 second Scan interval / 100 Kbyte = 1,7 Kbyte/s or 128 KBit/s).

As explained, the sensor does not measure, it gets the data from the device and calculates them properly.
https://www.paessler.com/manuals/prtg/snmp_traffic_sensor

Best regards.

Created on Sep 21, 2017 8:17:56 PM by  Dariusz Gorka [Paessler Support]



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