Nagios XI Alert for low or no bandwidth

[rbuckle]

How can you configure a probe to alert when the bandwidth through a monitored drops below a certain level?

[rkennedy]

You should be able to use a different parameter in your warning / critical thresholds, for you it would be appending a :, which represents <.

See this link for more info - https://nagios-plugins.org/doc/guidelin ... HOLDFORMAT

[ssax]

I've modified the plugin to add a new option -L (see attached) that will change it from greater than to less than, please test it out and let me know if that works.

check_rrdtraf_less.zip

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/usr/local/nagios/libexec/check_rrdtraf2 -f /var/lib/mrtg/192.168.X.X_1.rrd -w 1 -c 25 -l M -L

[rbuckle]

i tried using both methods but could not get it to not be a greater than alert

[lmiltchev]

What is not working for you? Can you elaborate?

I just tried the modified plugin provided by ssax, and it works just fine for me.
Example:

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[root@localhost libexec]# /usr/local/nagios/libexec/check_rrdtraf2 -f /var/lib/mrtg/192.168.x.x_7.rrd -w 1 -c 1 -l M
OK - Current BW in: .05Mbps Out: .08Mbps|in=.059158Mb/s;1;1 out=.080785Mb/s;1;1
[root@localhost libexec]# /usr/local/nagios/libexec/check_rrdtraf2 -f /var/lib/mrtg/192.168.x.x_7.rrd -w 1 -c 1 -l M -L
CRITICAL - Current BW in: .05Mbps Out: .08Mbps|in=.059158Mb/s;1;1 out=.080785Mb/s;1;1

[rbuckle]

This is what i get

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COMMAND: /usr/local/nagios/libexec/check_rrdtraf_less -f /var/lib/mrtg/10.0.0.27_5.rrd -w 5 -c 5 -l M -L
OUTPUT: CRITICAL - Current BW in: 7.94Mbps Out: 46.88Mbps|in=7.944299Mb/s;5;5 out=46.888900Mb/s;5;5

[lmiltchev]

Yeah, it seems like ssax's solution works only if the actual value is above the specified threshold but not when it is below it. Our developers will be looking this this.

For the time being, as a "workaround", you could try using the negate plugin with the original check_rrdtraf plugin (not ssax's version). Using the negate is pretty much straight forward. Here's our documentation on negate:
https://assets.nagios.com/downloads/nag ... ios-XI.pdf

Hope this helps. Let us know if you get stuck on something.

[rbuckle]

so do i have to create the plugin for the command? then create the command? or is it

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$USER1$/negate $USER1$/check_rrdtraf_bits -f /var/lib/mrtg/$ARG1$ -w $ARG2$ -c $ARG3$ -l $ARG4$

[lmiltchev]

You can also use:

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negate 	$USER1$/negate -s --ok=CRITICAL $USER1$/check_rrdtraf -f /var/lib/mrtg/$ARG1$ -w $ARG2$ -c $ARG3$ -l $ARG4$

This way, the output text will be also substituted (from OK to Critical).

[rbuckle]

You can also use:

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negate 	$USER1$/negate -s --ok=CRITICAL $USER1$/check_rrdtraf -f /var/lib/mrtg/$ARG1$ -w $ARG2$ -c $ARG3$ -l $ARG4$

This way, the output text will be also substituted (from OK to Critical).

This gives me a blank reply