[mrtg] [Fwd: Re: MRTG-bugs]

Lyle Giese lyle at lcrcomputer.net
Wed Dec 17 21:49:38 CET 2008

I did it again.  Forgot to include the list in my reply.


-------- Original Message --------
Subject: 	Re: [mrtg] MRTG-bugs
Date: 	Wed, 17 Dec 2008 14:42:28 -0600
From: 	Lyle Giese <lyle at lcrcomputer.net>
To: 	nangineni praneeth <nv_2030 at yahoo.com>
References: 	<764194.96446.qm at web65708.mail.ac4.yahoo.com>

nangineni praneeth wrote:
> Hello everyone
>                       ... I am using MRTG in my masters project and i 
> think i have noticed few errors in it...........
> 1) I have calculated the log file entries in the log file and took the 
> average over the time for which i ran MRTG.......The value which it 
> shows it different from the value which it graphed....Ther were couple 
> of people who posted this question on the mrtg forum but no one has 
> replied....So does anyone think this is a error or the way i am 
> calculating it is wrong
> 2) I posted this on the MRTG forum and one of them tried to give me an 
> explanation for this.......its  with the green colour traffic....the 
> traffic is showing as if it starts from zero....because i limited the 
> amount of traffic the server sends to 4kBPs so i must see a constant 
> line(or sawtooth like graph) on MRTG graphs but everything starts from 
> zero......i have checked my logfile and there are no zeroes in 
> it.........But the outbound traffic is showingup correctly like a 
> sawtooth waverform(because of TCP).........The same thing happened 
> when i was monitoring TCP connections on the server i suppressed the 
> blue colour graph and the same story every sample MRTG is graphing 
> starts from zero..........I am attaching a png image so that everyone 
> can understand it better
> 3)  I am using cisco router and when i saw the 5 min average input 
> rate and output rate..The values are different from the values MRTG is 
> reporting.................I have checked this many times.......
> ....I ran MRTG  continuously for 15 hours and and found these things
> Regards
> Venkat
You have not explained what or how you collected this data.  MRTG & 
rateup, in the absence of data, assumes a zero for the time period.  
MRTG & rateup default to a 5 min sample rate. 

You state you were collecting traffic from this device somehow, but the 
graph below shows connections, which is not the same as traffic. 

Unless you have written a special tool to collect ftp only traffic, the 
normal snmp data available is for total traffic only.

A cisco router traffic data is for all traffic.  A cisco router does not 
know how to separate http traffic from ftp traffic.  A cisco router can 
only show total traffic.

In other words, you have made some statements as to what you think are 
errors, but you have not provided any background as to how the data was 
collected, graphed, and what parameters were feed into MRTG & rateup.

Lyle Giese
LCR Computer Services, Inc.
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