I did it again. Forgot to include the list in my reply.
Lyle
-------- Original Message --------
Subject: Re: [mrtg] MRTG-bugs
Date: Wed, 17 Dec 2008 14:42:28 -0600
From: Lyle Giese <[email protected]>
To: nangineni praneeth <[email protected]>
References: <[email protected]>
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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