[mrtg] Re: Update: monitoring traffic in & out of Linux box

[tony bourke]

what kernel are you using?

and have you tried just using cfgmaker on the Linux box instead of using 
a config template?  Cfgmaker has always wworked for me in a Linux box.

Tony



On Sun, 5 Nov 2000, Leigh Orf wrote:

> 
> 
> 
> First of all thanks to those who responded to my query about monitoring
> traffic in & out of a Linux box. I was succesful in finding the port on
> the switch which handles my machine's traffic. I also managed to get
> snmpd to give me access to the interfaces.ifTable.ifEntry.ifOutOctets.2
> directive which mrtg uses to determine outgoing bandwidth on eth0.
> However, the value which that directive is returning is roughly 6 times
> smaller than what is being seen at the switch. The switch is returning
> the correct values. I am running an FTP server with a per-user 20 kB/s
> download bandwidth cap times about 20 users. I have mrtg running on the
> switch and on eth0 on my Linux machine. To view both, see
> 
> http://orf.cx/mrtg/128.109.218.2.3.html  (the switch port)
> http://orf.cx/mrtg/dryas.atms.unca.edu.html (eth0)
> 
> (Note the flip-flop in incoming/ougoing which occurred at 16:00 was
> my putting a hyphen before the Target directive since I was on the
> "wrong side" of the switch).  Using snmpget, I monitored the value of
> interfaces.ifTable.ifEntry.ifOutOctets.2 for my Linux box in a one
> minute interval and calculated the alleged outgoing bandwidth dividing
> the difference by 60, and MRTG is faithfully reporting the alleged
> bandwidth at eth0 from the returned values. So it appears for whatever
> reason snmpd is returning a number which isn't representative of the
> actual outgoing (and incoming) bandwidth. The values seems to
> be off by a factor of about 6.
> 
> Any clues??
> 
> Thanks,
> 
> Leigh Orf
> 
> 
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Tony Bourke				tony at vegan.net



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