[mrtg] two questions

[Chong Hiu Pun]

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>
Target[cis1601_trfs0]:.1.3.6.1.2.1.2.2.1.10.2&.1.3.6.1.2.1.2.2.1.16.2:public at 10.0.0.1
MaxBytes[cis1601_trfs0]: 193000
WithPeak[cis1601_trfs0]: ymw
Options[cis1601_trfs0]: growright, unknaszero,bits,nopercent
YLegend[cis1601_trfs0]: Bits per second
ShortLegend[cis1601_trfs0]:
Legend1[cis1601_trfs0]:
Legend2[cis1601_trfs0]:
Legend3[cis1601_trfs0]:
Legend4[cis1601_trfs0]:
LegendI[cis1601_trfs0]: In:&nbsp
LegendO[cis1601_trfs0]: Out:&nbsp

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