nangineni praneeth wrote:
sorry for not being clear......I was using MRTG with rateup and i set
the poll for every 5 minutes...I was monitoring tcp connections and as
well as inbound and outbound traffic...I just gave an example on
established tcp connections to show how MRTG is representing the green
colour graph(showing everything from zero instead of a constant
line)...Yes i do know that MRTG assumes zeroes in absense of
traffic.But i have checked the logfile and there were no zeroes at
all... This log file shows the entries of the number of tcp
connections established...........
Not absence of traffic, but absence of data in your data files(for a
time period). minor but significant difference to MRTG & rateup.
it shows 8 8 8 8
8 8 8 8
until i polled for the last time
This snippet shows the data, but not the timestamps on them. And you did
not post the captions against the graphs so we can see what the green
portion represented. And the green uses a fill method in the graphs,
painting the area under the lines. I also suspect you will have better
control over the graphing if you convert to rrd and use a frontend like
routers2 to make the graphs.
Lle
This is my configfile.........
Target[tcp]: .1.3.6.1.2.1.6.9.0&.1.3.6.1.2.1.6.9.0:commun...@server
maxbytes[tcp]: 100
options[tcp]:gauge,nopercent,integer,noo
So as i understand since the logfile is showing constant entries MRTG
should also graph a constant line but instead it was showing graphs
starting from zero........But if i represnt the graph by hiding the
first variable(that is green colour graph) it is showing a constant line
The values below the graph were like
tcp connections; max: 8 connections average:8 connections current: 8
connections
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.
The only traffic i was using in my lab environment was ftp
traffic........yeah cisco router traffic includes cdp traffic,ftp
traffic...........But MRTG was reporting higher traffic rate than the
cisco router is showing
Regards
Venkat
--- On *Thu, 12/18/08, Lyle Giese /<[email protected]>/* wrote:
From: Lyle Giese <[email protected]>
Subject: [mrtg] [Fwd: Re: MRTG-bugs]
To: [email protected]
Date: Thursday, December 18, 2008, 2:19 AM
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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