Unfortunately, MRTG doesn't support negative numbers (only positive integers) without using RRDTool.
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Craig Metzer Sent: Wednesday, April 18, 2007 10:53 AM To: [email protected] Subject: [mrtg] Problem with Negative Numbers I'm trying to poll a satellite modem for Rx Signal Level. The modem returns a negative integer ten times the level (ex. -575 indicates the level is -57.5 dBm). I've configured a conversion function so I can log the value returned by snmpget and compare it to the value in the log file. It appears that MRTG is not recognizing the number as negative. It appears it is not recognizing the binary 1 MSD as a negative sign. =========== Config file: ConversionCode: functs.pl Target[my-pub-sat-01-rsl]: .1.3.6.1.4.1.6247.28.1.3.3.4.0&.1.3.6.1.4.1.6247.28.1.3.3.4.0:[EMAIL PROTECTED] pub-sat-01.domain.gov|neg_int ========== Functs.pl: sub neg_int { my $n = shift; open FH, ">> rx_lvl.log"; # my $o = (2^31 - $n) / 10; my $o = $n / 10; print FH localtime(time) . " -> IN: $n\tOUT: $o\n"; close FH; return $o; } =========== Logs: $head my-pub-sat-01-rsl.log 1176910486 2147483590 2147483590 1176910486 0 0 0 0 1176910186 0 0 0 0 1176909900 0 0 0 0 1176909600 0 0 0 0 1176909300 0 0 0 0 1176909000 0 0 0 0 $ cat rx_lvl.log Wed Apr 18 16:29:46 2007 -> IN: -578 OUT: -57.8 Wed Apr 18 16:29:46 2007 -> IN: -578 OUT: -57.8 Wed Apr 18 16:34:46 2007 -> IN: -578 OUT: -57.8 Wed Apr 18 16:34:46 2007 -> IN: -578 OUT: -57.8 ________________________________ Don't quit your job - Take Classes Online and Earn your Degree in 1 year. Start Today! <http://g.msn.com/8HMAENUS/2743??PS=47575>
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