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MRTG questions

Posted on 2003-02-19
Medium Priority
Last Modified: 2008-03-10
Dear all,
    I am a new mrtg user and want to ask about the following questions:
1.) I want to do a self monitoring. If the monitoring machine is up, it will return 1; otherwise (e.g no network, reboot, power off) it will return 0. I try to do this by monitoring the operational status of loopback interface ( .iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifOperStatus ). However, it always return 1. Which thing should I monitor so as to fulfil my purpose?
2.) I use Linux to monitor a few routers' traffic. I found something strange: e.g If my linux is down for about 30 minutes, and then up again, I found that the traffic value will have a surge and then back to normal again :
Inside my log file
1045689900 91 47 96 50
1045689600 113 54 122 58
1045689300 39 51997 122 76440            <---a surge in traffic
1045689000 0 24460 0 76440                  <-- a surge in traffic
1045688700 0 0 0 0
1045688400 0 0 0 0
1045688100 0 0 0 0
1045687800 0 0 0 0
1045687500 0 0 0 0
which shows incorrect data on the graph. How can I fix this problem ?
Thank you very much!
ps below is part of my cfg file:
Title[cis1601_trfs0]: Cisco 1601 Serial0 Traffic Rate
PageTop[cis1601_trfs0]: <H1>Cisco 1601 Serial0 Traffic Rate</H1>
MaxBytes[cis1601_trfs0]: 193000
WithPeak[cis1601_trfs0]: ymw
Options[cis1601_trfs0]: growright, unknaszero,bits,nopercent
YLegend[cis1601_trfs0]: Bits per second
LegendI[cis1601_trfs0]: In: 
LegendO[cis1601_trfs0]: Out: 
50pts for 1 question, 100pts for 2.
Question by:hpchong7
  • 2
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LVL 79

Expert Comment

ID: 7981237
G'day hpchong7

Your surge in traffic is because the daemon died. When that happens, MRTG takes the traffic counters at the last poll, then creates the average over the next 30 minutes which does not change so you see a long flat line. That line could be high, or it could be low depending on the last poll. You can always just edit the log file to fix the graph. I put a UPS on my system that polls.

A loopback interface is always up. Use the Ethernet interface IP to monitor. I'm assuming you want to monitor the monitor machine from another one?


Author Comment

ID: 7991215
Of course I know, but I did not want to edit the log file by hand, any auto-mechanism to get around/solve this? Thanks!

LVL 79

Accepted Solution

lrmoore earned 200 total points
ID: 7996475
No way around it that I know of...
I suppose you could write some custom script that would run whenever the system comes up to automatically edit the log file..

Author Comment

ID: 8001751
Anyway thank you very much.

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