[mrtg] Re: RSSI value

Steve Shipway s.shipway at auckland.ac.nz
Thu Dec 18 21:45:44 MET 2003

>>i'm  trying to use mrtg to monitor the  Received Signal 
>Strength of my 
>>cable modem interfaces.Negative values are involved from the 
>ranges of 
>>-5 to -106  can anyone help me PLEASE!
How about using RRDTool, and tuning the file?

Once the .rrd file has been created, use RRDTune to set the minimum value to
something lower than 0, and then the data should be collected OK.  Use
routers.cgi/14all.cgi/mrtg-rrd to display the data.

You have to manually Tune the initially created rrd since the default
creation is for a range 0->MaxBytes.  Anything outside this range will not
be stored, but you should be able to modify it and then negatives will be

If MRTG will not collect negatives via SNMP then write a wrapper to do it.
I know RRD is quite happy with negatives.


Remember: you can tune an rrd file, but you can't tunafish.

Steve Shipway: ITSS, University of Auckland
Email: s.shipway at auckland.ac.nz  Web: http://www.steveshipway.org/  
** We can only discover new oceans when we have the **
** courage to lose sight of the shore.              **

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