8 More Discussions You Might Find Interesting
1. Red Hat
Hi Guys,
Why do we use RRDtool in MRTG?
I have implemented MRTG for some routers,
I have read some notes about RRDTOOL also but don't know what is use of these tool.
Any one one please explain me the use of RRDTOOL in their own words? (1 Reply)
Discussion started by: manalisharmabe
1 Replies
2. Red Hat
I have installed MRTG on my Linux 5.5 system. then i started copying data from the machine when MRTG is installed to another machine. I could see some changes in graphs.
But can't understand what does that mean?
Moreover how to see load on the system where MRTG is installed by copying files... (2 Replies)
Discussion started by: manalisharmabe
2 Replies
3. AIX
hi,
I used to use MRTG monitor Redhat, CentOS.
But, i found that. I can't snmpwalk to my AIX 6.1
I want to know, how can I snmpwalk my AIX 6.1's
CPU usage, Memory usage, New TCP connection, EST. TCP connection
and the Harddisk Size....etc.
thanks. (1 Reply)
Discussion started by: virusxx
1 Replies
4. Red Hat
THESE ARE MY INFORMATION ABOUT MRTG AND LIBERIES.
I have mrtg version “mrtg-2.17.2”
Then after running
:rpm -qa | grep gcc I got
gcc-4.4.4-13.el6.x86_64
libgcc-4.4.4-13.el6.x86_64
libgcc-4.4.4-13.el6.i686
Then after running
:rpm -qa | grep gd I got... (1 Reply)
Discussion started by: manalisharmabe
1 Replies
5. Infrastructure Monitoring
hello all,
could you please tell me how much time it will take setting up (for the first time) :
MRTG, Cacti and Nagios on a network with ~25 routers and ~50 switches ?
i am a bit familiar with perl and shell scripting.
thanx in advance (3 Replies)
Discussion started by: OneDreamCloser
3 Replies
6. Shell Programming and Scripting
Hello All,
Can anyone tell me that how to make MRTG graph by picking values through a simple file. If you have such script of MRTG then please tell me the details.
Actually my scenarios is that i want to make a Graph through a simple file in which values randomly changes.
I hop you... (1 Reply)
Discussion started by: wakhan
1 Replies
7. Cybersecurity
hye all..
I like to know if anyone here can justify and make wise recommendation to me, whether to choose MRTG or NAGIOS as network Monitoring Performance.
If can, is there any website that provide comparison for both of them?
Ur help are highly appreciated..
Regards,
~unknown (1 Reply)
Discussion started by: unknown2205
1 Replies
8. IP Networking
Hi,
I need help to discovery the correct MIB to monitoring CPU, Memory and Hard Disc in Unix. I get any MIB in the internet, but don´t work. Anybody help-me?
Thanks.
Marcio Dunder Perin (2 Replies)
Discussion started by: dunder
2 Replies
LEARN ABOUT SUSE
mrtg-faq
MRTG-FAQ(1) mrtg MRTG-FAQ(1)
NAME
mrtg-faq - How to get help if you have problems with MRTG
SYNOPSIS
MRTG seems to raise a lot of questions. There are a number of resources apart from the documentation where you can find help for mrtg.
FAQ
In the following sections you'll find some additonal Frequently Asked Questions, with Answers.
Why is there no "@#$%" (my native language) version of MRTG?
Nobody has contributed a @#$%.pmd file yet. Go into the mrtg-2.16.2/translate directory and create your own translation file. When you are
happy with it send it to me for inclusion with the next mrtg release.
I need a script to make mrtg work with my xyz device.
Probably this has already been done. Check the stuff in the mrtg-2.16.2/contrib directory. There is a file called 00INDEX in that directory
which tells what you can find in there.
How does this SNMP thing work
There are many resources on the net that explain SNMP. Take a look at this article from the Linux Journal by David Guerrero
http://www.david-guerrero.com/papers/snmp/
And at this rather long document from CISCO.
http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/snmp.htm
The images created by MRTG look very strange.
Remove the *-{week,day,month,year}.png files and start MRTG again. Using MRTG for the first time, you might have to do this twice. This
will also help when you introduce new routers into the cfg file.
What is my Community Name?
Ask the person in charge of your Router or try 'public', as this is the default Community Name.
My graphs show a flat line during an outage. Why ?
Well, the short answer is that when an SNMP query goes out and a response doesn't come back, MRTG has to assume something to put in the
graph, and by default it assumes that the last answer we got back is probably closer to the truth than zero. This assumption is not per-
fect (as you have noticed). It's a trade-off that happens to fail during a total outage.
If this is an unacceptable trade-off, use the unknaszero option.
You may want to know what you're trading off, so in the spirit of trade-offs, here's the long answer:
The problem is that MRTG doesn't know *why* the data didn't come back, all it knows is that it didn't come back. It has to do something,
and it assumes it's a stray lost packet rather than an outage.
Why don't we always assume the circuit is down and use zero, which will (we think) be more nearly right? Well, it turns out that you may
be taking advantage of MRTG's "assume last" behaviour without being aware of it.
MRTG uses SNMP (Simple Network Management Protocol) to collect data, and SNMP uses UDP (User Datagram Protocol) to ship packets around.
UDP is connectionless (not guaranteed) unlike TCP where packets are tracked and acknowledged and, if needed, retransmitted. UDP just
throws packets at the network and hopes they arrive. Sometimes they don't.
One likely cause of lost SNMP data is congestion; another is busy routers. Other possibilities include transient telecommunications prob-
lems, router buffer overflows (which may or may not be congestion-related), "dirty lines" (links with high error rates), and acts of God.
These things happen all the time; we just don't notice because many interactive services are TCP-based and the lost packets get retransmit-
ted automatically.
In the above cases where some SNMP packets are lost but traffic is flowing, assuming zero is the wrong thing to do - you end up with a
graph that looks like it's missing teeth whenever the link fills up. MRTG interpolates the lost data to produce a smoother graph which is
more accurate in cases of intermittent packet loss. But with V2.8.4 and above, you can use the "unknaszero" option to produce whichever
graph is best under the conditions typical for your network.
AUTHOR
Tobias Oetiker <tobi@oetiker.ch>
2.16.2 2008-05-16 MRTG-FAQ(1)