# Discover Individual Devices

The term ['Discovery'](https://www.manageengine.com/network-monitoring/help/getting-started-discovery.html) in OpManager refers to the addition of devices or interfaces for monitoring its various parameters. OpManager uses ICMP (ping) to check the reachability of the device and for device addition. This document will cover the steps to discover individual devices in OpManager.

[Click here](https://www.manageengine.com/network-monitoring/help/discover-networks.html) for the steps to Discover networks in OpManager.

1. Go to **Settings → Discovery → Add Device/Server.**
2. Type either the IP Address or the Device Name of the device to be discovered.
3. Click on the **Ping icon** near the Device Name / IP Address section to ping the device and check its availability. [Know more](https://www.manageengine.com/network-monitoring/help/add-device.html#device-ping)
4. Select the required **Credentials**.
5. Click on **Add Device** to start discovery

![Discover individual devices in OpManager: Add device credentials screen](https://www.manageengine.com/network-monitoring/help/images/discover-individual-devices-1.png)

## What is the function of 'ping'?

OpManager continuously monitors the availability of your entire network. It sends a ping to the monitored devices every 2 minutes and records its response. If there is no response for two consecutive pings, OpManager considers the device as unavailable. During discovery, the ping function is used to determine whether the device is reachable from the OpManager server. The number of pings and their time interval can be assigned depending on our business needs.

![Discover individual devices in OpManager: device availability ping](https://www.manageengine.com/network-monitoring/help/images/device-ping.PNG)

**Note:** The 'Add Credentials' option can be used to create a new credential that is supported by your device. Credentials are configured to access the device for discovery, classification (device model, category, etc.) and performance monitoring. [Learn more](https://www.manageengine.com/network-monitoring/help/add-credentials.html)

Looking to add a Linux device with SSH key-based credentials? [Click here.](https://www.manageengine.com/network-monitoring/help/adding-devices-using-ssh.html#SSH_key_Linux)

## Frequently asked questions:

1. [How to discover devices and interfaces in OpManager?](https://www.manageengine.com/network-monitoring/help/discover-networks.html)
2. [How to add a new credential?](https://www.manageengine.com/network-monitoring/help/add-credentials.html)
3. [Can I add a non-admin user account for WMI?](https://www.manageengine.com/network-monitoring/kb/adding-non-admin-user-for-wmi.html)
4. [Can I add devices using SSH?](https://www.manageengine.com/network-monitoring/help/adding-devices-using-ssh.html)
5. [Why are devices discovered as 'Unknown'?](https://www.manageengine.com/network-monitoring/faq/devices-discovered-as-unknown-devices-opmanager.html)
6. [What are devices supported in OpManager?](https://www.manageengine.com/network-monitoring/faq/all-devices-supported.html)
7. [Why are interfaces not discovered for my device?](https://www.manageengine.com/network-monitoring/faq/interfaces-not-discovered.html)
8. [How can I associate device templates to a newly discovered device?](https://www.manageengine.com/network-monitoring/help/associate-device-template.html)
9. [How to associate monitors to the discovered device?](https://www.manageengine.com/network-monitoring/help/adding-custom-monitors.html)
10. [What is a discovery filter?](https://www.manageengine.com/network-monitoring/help/discovery-filter.html)
11. [How do I configure a new discovery rule?](https://www.manageengine.com/network-monitoring/help/configuring-discovery-rule-engine.html)
12. [How to manage or unmanage a device?](https://www.manageengine.com/network-monitoring/help/managing-and-unmanaging-a-device.html)
13. [How to configure device dependencies?](https://www.manageengine.com/network-monitoring/help/configuring-device-dependencies.html)
14. [How can find the missing VMs and hosts?](https://www.manageengine.com/network-monitoring/faq/find-missing-vms-and-hosts-opmanager.html)
15. [How can I discover a VLAN?](https://www.manageengine.com/network-monitoring/faq/vlan-discovery-in-opmanager.html)
16. [How does availability monitoring work in OpManager?](https://www.manageengine.com/network-monitoring/availability-monitoring.html)
17. [What are the basic system requirements to install and use OpManager?](https://www.manageengine.com/network-monitoring/help/hardware-and-software-requirements.html)
18. [How can I troubleshoot issues with device discovery?](https://www.manageengine.com/network-monitoring/help/add-device-failure-messages.html)
19. [How can I troubleshoot issues with VCenter/ESX discovery?](https://www.manageengine.com/network-monitoring/faq/troubleshooting-problems-in-vcenter-discovery.html)