Service Monitoring Rule for an interface (of a server monitored via SNMP)

[Tasos]

Dear community,

I am using SNMP to monitor different hosts.

As you can see in the following screenshot, some services show information about the interfaces of the host I am monitoring.

Let’s say the interface goes down or the cable from that interface gets unplugged, how can I check/test if CheckMK will show that service in a CRITICAL state? Is that possible?

On top of that, is there a way to manipulate that behavior by creating a service monitoring rule? And if yes, which rule would you use for that?

Thank you in advance for any help!

[mike1098 (Michael FRANK)]

Hi Tasos,

Not sure if I understood what you are missing.
The rule in question is ‘Network interfaces and switch ports’ but maybe its also worth to have a look at ‘Network interface and switch port discovery’.

Beside that its worth to read the documentation and according blog posts e.g.:

Blog | Checkmk

regards

Mike

[andreas-doehler (Andreas)]

@Tasos

Let’s say the interface goes down or the cable from that interface gets unplugged, how can I check/test if CheckMK will show that service in a CRITICAL state?

There is no direct check possible but you can inspect the monitoring parameter for the interface like @mike1098 said.

In general you can keep in mind that CMK will alert every change from the current state to you if no rules are defined.

[Tasos]

Thank you both for your replies!

The Network interfaces and switch ports rule helped me achieve what I wanted.

Specifically, under Value > operational state, I only chose ‘‘up’’. Further down I chose the hosts and interfaces of interest and that changed the down interfaces of interest to be shown as CRIT.

I’ll also have a look at the link you shared!