Problems with service check

[Danilo Perdomo]

Hi all!  I'm having a problem with a service check. The thing is that 
the variable that i want to monitor
decreases instead of increasing, the variable is the battery backup time 
of an UPS. The normal value
should be 20 minutes of backup, but i want the Nagios to send me a 
warning when the value decreases
to 15 minutes, and a critical when it goes down to 10. I understand that 
the check_snmp command
only checks increasing values when you set the threshold. How can i do 
to check decreasing values??
Hope you can help me, thanks in advanced!

-- 
Danilo Perdomo
VP Operaciones Técnicas
Intercable Barquisimeto - MSO
Ext.: 5393
Tlf.: 58-251-3355393 
      58-251-9355393
Cel.: 58-414-5750938
www.inter.com.ve


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