How to change device availability monitoring from ICMP to TCP or SNMP?
Monitoring via TCP
Here, the availability of the configured device is calculated based on the successful socket connection between the OpManager server and the TCP port of the monitored device.
TCP based availability monitoring is most suitable for ping disabled environments or networks that solely prefer TCP port based monitoring for security reasons. OpManager recommends using this protocol for TCP enabled environments that does not attract abundant traffic, i.e., medium scaled networks. OpManager discovers devices using ICMP by default, but can be changed later from the Inventory or individual snapshot pages.
Additional configurations required:
TCP configured port should be allowed by the antivirus or your firewall. The specified port can be any available port between the industry specified range of 0 and 65,535.
How do I enable TCP monitoring?
Go to the respective device snapshot page, click on the Edit device details option and select TCP option under 'Availability Monitoring Via'.
To perform this action in bulk, select the devices from the Inventory and choose 'Monitor Availability via TCP' from the Inventory Actions.
Monitoring via SNMP
SNMP based availability monitoring can only be configured and used if all the device are SNMP implemented. This requires SNMP credentials to be associated with all the monitored devices.
OpManager supports SNMP v1,v2 and v3 credentials. An SNMP ping request is sent to the destination device and the availability monitoring is calculated based on the successful SNMP response from the device. If the SNMP credentials expire, the associated device will be notified as unreachable and marked as Down. The data loss in SNMP based availability monitoring is close to zero and is recommended for medium scaled networks.
Additional configurations required:
SNMP ports should be specified and enabled while configuring the credentials.
The SNMP port (default port 161) configured should not be allowed in the antivirus or firewall.
Make sure the SNMP credentials are not periodically expired for continuous availability monitoring.
Make sure there are no lag in the SNMP response from the devices in your network. If encountered, the SNMP timeout can be increased according to your network. (Note: An increased timeout value may result in an overall delay in availability monitoring.)
How do I enable SNMP monitoring?
Go to the respective device snapshot page and click on the Edit device details option.
Select SNMP option under 'Availability Monitoring Via' and select the appropriate credential (SNMP v1/v2/v3).
To perform this action in bulk, select the devices from the Inventory and choose the 'Associate credentials' option from the Inventory Actions. Select the appropriate SNMP v1/v2/v3 credential and click on Save.
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