How to override the speed of just 1 interface?

So we’re pulling in our firewalls into checkmk. Our WAN interface reports in checkmk as 1Gbps. Which technically it is. But any bandwidth calculations in terms of interface usage is going to be based on ~1000mbps.

However, our internet circuit in the datacenter is only 200mbps. We’d like to adjust checkmk to think this interface is only 200mbps so when we’re using 100mb the interface would report being 50% utilized.

How would I go about adjusting this for just 1 port on 1 device? Please break it down as I’m very new to Checkmk’s interface.

easy, I think. Go to the interface where you want to change the speed, open the action menu (three lines beside the interface) and click on Parameters for this service

Under Check origin and parameters click on Network interfaces and switch ports click on Add rule for current host and port this will create a new interface rule. Under ConditionsExplicit hosts should show up your host and Port should contain the interface you want to change the speed for i.e.

Now you can under ValueOperating speed configure the speed you want i.e.
image

Save and acticate your changes and you should be fine.

So that technically worked, but now the interface is in WARN state.

So a better way to do this seems to be adjusting the ‘assumed input speed’ and ‘assumed output speed’.

My gripe here though is that even though you specify bits per second. And the label in the rule GUI literally shows “Bits per second”

when you look at the interface it shows up as MB/s. (megabytes per second). Why?
Granted, yes, technically 200Mb/sec is 25MB/sec, but if everything is showing you bits, why all of a sudden is the GUI using MB/sec ?

youre right assumed speed is the better option.

any thoughts on the 25MB/sec issue?

Inside the rule with the assumed speed you have also the option “Measurement unit” there you can switch between Bits and Bytes.

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I already tried that. No change. Still shows as 25.0MB/s

Edit: had to wait a minute for Check_MK service to re-query the host. All good now. Thanks.

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