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Home > Success Center > Network Performance Monitor (NPM) > NPM - Knowledgebase Articles > Polling methods used by Orion

Polling methods used by Orion

Updated March 11th, 2016

Overview

This article discusses the following kinds of polling methods to collect performance information from monitored devices:

Environment

All Orion Platform products

Detail

Internet Control Message Protocol (ICMP)

Orion Platform products use the Internet Control Message Protocol (ICMP) to poll for status using ping and echo requests of managed devices.

  • If the device is operationally up, it returns a response time and record of any dropped packets. This information is used to monitor status and measure average response time and packet loss percentage for managed devices.

    Orion Platform products only use ICMP to poll devices for status, average response time, and packet loss percentage. Other information displayed in the Orion Web Console is obtained using SNMP requests.

For more information, see ICMP.

Simple Network Management Protocol (SNMP)

This Orion Platform topic applies to the highlighted products:

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For most network monitoring and management tasks, SolarWinds Orion products use SNMP.

  • To monitor devices on your network, you must enable SNMP on all devices that are capable of SNMP communications. The steps to enable SNMP differ by device, so you may need to consult the documentation provided by your device vendor.
  • If SNMPv2c is enabled on a device you want to monitor, by default, SNMPv2c is used to poll the device for performance information. If you only want to poll using SNMPv1, you must disable SNMPv2c on the device to be polled.

For more information about MIBs, see Management Information Base (MIB).

For more information about SNMP, see SNMP.

Windows Management Instrumentation (WMI)

This Orion Platform topic applies to the highlighted products:

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Windows Management Instrumentation (WMI) is a proprietary technology used to poll performance and management information from Windows-based network devices, applications, and components. When used as an alternative to SNMP, WMI can provide much of the same monitoring and management data currently available with SNMP-based polling with the addition of Windows-specific communications and security features.

For more information about WMI, see the Microsoft article, About WMI. (© 2017 Microsoft, available at https://msdn.microsoft.com, obtained on May 8th, 2017.)

Due to specific characteristics of WMI polling requests, polling a single WMI-enabled object uses approximately five times the resources required to poll the same or similar object with SNMP on the same polling frequency.

Agents

Updated: June 11, 2018

This Orion Platform topic applies to the highlighted products:

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An agent is a software that provides a communication channel between the Orion server and a Windows or Linux/Unix computer. Products install plugins on agents to collect the data that the agents send back. This can be beneficial in situations such as:

  • Polling hosts and applications behind firewall NAT or proxies.
  • Polling nodes and applications across multiple discrete networks that have overlapping IP address space.
  • Secure, encrypted polling over a single port.
  • Support for low bandwidth, high latency connections.
  • Polling nodes across domains where no domain trusts have been established.
  • Full, end-to-end encryption between the monitored host and the main polling engine.

You can monitor servers hosted by cloud-based services such as Amazon EC2, Rackspace, Microsoft Azure, and other Infrastructure as a Service (IaaS).

After deployment, all communication between the Orion server and the agent occur over a fixed port. This communication is fully encrypted using 3072-bit TLS encryption. The agent protocol supports NAT traversal and passing through proxy servers that require authentication.

While changing polling method from SNMP to WMI, make sure to List Resources and select intended objects/properties for polling.

 

Disclaimer: Please note, any content posted herein is provided as a suggestion or recommendation to you for your internal use. This is not part of the SolarWinds software or documentation that you purchased from SolarWinds, and the information set forth herein may come from third parties. Your organization should internally review and assess to what extent, if any, such custom scripts or recommendations will be incorporated into your environment.  You elect to use third party content at your own risk, and you will be solely responsible for the incorporation of the same, if any.

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