1. Introduction

2. SNMP server

2.1 Installation

Initially we install the packets needed for SNMP. Yum makes this job a lot easier.

Next we make snmpd service to start automatically for the runlevels we want.

And we start the server.

 
We can see that it is running in port 199.

2.2  Configuration

We run ‘snmpwalk’ which creates a “tree” of information for our network.

 
If you see an output like this one you may proceed with the MRTG installation. Else you should make some configuration first.

We open it
 

And do the follow changes:

• we change this line

with those

• we change those lines

• we change those lines

with this one

• we change this line

with those

• and finally we change those lines

2.3 Check

We restart the server to take affect of the notices

And we run again

Now we should see something like that

Where 10.103.0.33 is your ip address.

3. MRTG

3.1 Installation

We again use yum

3.2 Configuration

We create the folder in which our graphs and html pages will be kept

And we run ‘cfgmaker’ for the configuration file to be created.

Here you should pay notice to --output /etc/mrtg/mrtg.cfg as long as to public@localhost. With this command we tell MRTG to create a configuration file with the name ‘mrtg.cfg’ for the traffic of our computer (localhost). Instead of localhost you may put the address of any computer you may monitor as long as it runs SNMP.

Next we create our default index page

3.2.1 Apache configuration

Next we have to configure apache for MRTG to work correctly. MRTG creates a file ‘mrtg.cfg’ under /etc/httpd/conf.d we contains all the necessary for Apache. We change it to contain the ips we want to have access to our MRTG graphs. Here I have added all my network.

3.3 Check

We run the following command 

In case you get an error like this

you have to run the above command more than once till it runs without any error. This is normal.

Finally we open our browser and type

You should see something like this

And by clicking on it something like this

There are daily, weekly, monthly and yearly graphs which aren’t shown in the screenshot. By changing the .cfg file we can alter the information displayed to what we just want.

4. Outroduction

With the same way it is possible to add as many computers as we want and therefore have a general overview of our network. Enjoy! ;)

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Pennada Prabhu Kiran said:

	LANG = en_US.UTF-8 I am not abel to run MRTG Error in Firefox "You don't have permission to access /mrtg/ on this server" can u please help me out
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March 29, 2007
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axel said:

	Just in case, have you edited
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March 29, 2007
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Joe said:

	I followed these instructions - how can I allow for all to view these pages? I don't need to deny at all. Do I just simply state Allow all?
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June 11, 2007
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axel said:

	Hey Joe. Just use this mrtg.cfg and you should be ok. Alias /mrtg /var/www/mrtg Order allow,deny Allow from all
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June 14, 2007
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beler said:

	try with this cfgmaker --global "workdir: /var/www/mrtg/html/mrtg" -ifref=ip --output /etc/mrtg/mrtg.cfg --global 'options[_]: growright,bits' public@localhost
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March 21, 2008
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Md. Zafar Al Masood said:

	Hi, I have also the problem in Fedora 8 "You don't have permission to access /mrtg/ on this server" I followed the comments.. nothing happens Then Just Change the line in mrtg.cfgђ under /etc/httpd/conf.d as follows: Alias /mrtg /var/www/mrtg Order allow,deny Allow from all Then restart httpd and find all the graphs in Mozilla firefox
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September 10, 2008
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Md. Zafar Al Masood said:

	Change the word "location" replace with "Directory" in mrtg.cfgђ under /etc/httpd/conf.d
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September 10, 2008
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axel said:

	Hello Md. Zafar Al Massod. When I was writing this guide the mrtg.cfg worked for me. Can you try and use this mrtg.cfg Alias /mrtg /var/www/mrtg Order deny,allow Deny from all Allow from 127.0.0.1 and then open Firefox like this: http://127.0.0.1/mrtg ?
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September 10, 2008
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Md. Zafar Al Masood said:

	Could you help me how to configure more than two machine in the network mrtg?
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October 16, 2008
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axel said:

When using the cfgmaker you must choose different IPs and different .cfg names. cfgmaker --global "workdir: /var/www/mrtg" -ifref=ip1 --output /etc/mrtg/mrtg1.cfg --global 'options[_]: growright,bits' public@localhost cfgmaker --global "workdir: /var/www/mrtg" -ifref=ip2 --output /etc/mrtg/mrtg2.cfg --global 'options[_]: growright,bits' public@localhost Then you could make a master.cfg which will include the above .cfg files to gather data from all the machines in your network. Include: mrtg1.cfg Include: mrtg2.cfg

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October 18, 2008
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T. A. Sumesh said:

	I have installed mrtg but it giving following error. "Forbidden You don't have permission to access /mrtg/ on this server." I have tried all the solution suggested above. Can somebody help me to solve this
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March 06, 2009
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axel said:

	Hi T.A. Sumesh. Which distribution and mrtg version are you using? This guide is a little old. I need to update it and check if anything has changed. :/
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March 07, 2009
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Dev said:

	Hi, How do I add more machines and more info; like system temperature, memory utilization etc to the mrtg? Any good tutorials or links with step by step appreciated.
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July 07, 2009
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axel said:

	Hi Dev, You can use the cfgmaker command to add more computers. You must use a different output file instead of mrtg.cfg e.g. mrtg_pc2.cfg I haven't used mrtg to monitor temperature so I can't help you with this.
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July 09, 2009
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Roberto Lezcano said:

	Your work in this guide is fantastic, this guide fix my live.... Thanks P.D. I'm speak espanish my ingles is bad... :-(
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August 22, 2009
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axel said:

	Thank you very much Roberto!
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August 30, 2009
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poswer said:

	Forbidden You don't have permission to access /mrtg/ on this server. Apache/2.2.11 (Fedora) Server at localhost Port 80
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September 04, 2009
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poswer said:

i gave http://localhost/mrtg could not show chart can you help me. MRTG Index Page MRTG Multi Router Traffic Grapher version 2.16.2 Tobias Oetiker and Dave Rand but http://10.0.0.0/mrtg and http://hostname/mrtg it show error page. "You don't have permission to access /mrtg on this server. Apache/2.2.11 (Fedora) Server at hostname Port 80 Forbidden You don't have permission to access /mrtg/ on this server. Apache/2.2.11 (Fedora) Server at 10.0.0.1 Port 80 help me. thanks

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September 04, 2009
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poswer said:

	hi, at this time I had difficulty, after install mrtg on fedora 11 mrtg can be run, the value of traffic is not showing the traffic chart does not appear. any one can show me the way..... thanks..
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September 04, 2009
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FUAD said:

	This instruction is nice. I create default mrtg graph its ok but When I add new pc 0R device in mrtg graph they are not show... Index page is show but no graph and inner page is not create Please help me
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November 02, 2009
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axel said:

	I'm sorry FUAD. It has been a few years since I last used mrtg. Therefore I don't know what you might have done wrong. I only remember that you have to make a different .cfg file for each computer you want to add.
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November 02, 2009
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