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Home > Success Center > Network Performance Monitor (NPM) > How Orion calculates the polling response time using SNMP and ICMP

How Orion calculates the polling response time using SNMP and ICMP

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Created by Malik Haider, last modified by Rodim Suarez on Jul 04, 2016

Views: 401 Votes: 5 Revisions: 11

Overview

This article explains how SolarWinds Orion calculates the response time using SNMP and ICMP, and describes the polling response time differences between Internet Control Message Protocol (ICMP) and Simple Network Management Protocol (SNMP).

Environment

Orion NPM 11.0 and later

Detail

See the appropriate section below. 

 

Calculate the response time

After you select SNMP  in a packet analyzer for the Status & Response Time, Orion begins monitoring the device by sending a request to follow object OID 1.3.6.1.2.1.1.2.0.

The request packet is sent by regular interval, and each get request will be waiting for a get response from the device.

After the get-response packet is received, the ms time is calculated between the get-request & get-response packets to generate and calculate the response time from the node.

The following illustration shows the SNMP setting in the Wireshark packet analyzer,

sr.PNG

 

Below is an example of an SNMP get-request packet.

snmp.PNG

 

Below is an example of an SNMP get-response packet.

gr.PNG

 

Polling response: ICMP vs SNMP

After you select ICMP (Ping) - Fastest, the simple ICMP packet is sent through the Orion Engine and calculates the actual Response time sent within the packet.

The following illustration shows the ICMP (Ping) - Fastest setting in the Wireshark packet analyzer,

icmp.PNG

 

icmpreq.PNG

 

 

icmpreply.PNG

 

 

You will notice high Response Time values compared with ICMP  when monitoring through SNMP. This is normal behavior, as the device processes the SNMP request through the SNMP engine—depending on its availability. 

 

lrb.PNG

 

 

 

Last modified
18:10, 3 Jul 2016

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