The Multi Router Traffic Grapher

Latest Release: MRTG 2.9.6


Programming: Tobias Oetiker <>, Dave Rand <>
and many contributors from the global Village
DNS Reflectors: (by Timothy Kennedy of YellowBrix, Inc) (by Michel Renfer of LAN Services AG)
WWW Mirrors: Swiss Original, IT, US, FR, JP, USA, CZ, BR, BR, JP, ( USA, UK, TH ).
FTP Mirrors: SE, NO, RU, US, BR, US, CZ, IT, US, TW, JP, ( USA, RO Poland, DE, JP ).
Translations: Japanese, Espagnol.
What is the Multi Router Traffic Grapher?

The Multi Router Traffic Grapher (MRTG) is a tool to monitor the traffic load on network-links. MRTG generates HTML pages containing GIF images which provide a LIVE visual representation of this traffic. Check for an example. MRTG is based on Perl and C and works under UNIX and Windows NT. MRTG is being successfully used on many sites around the net. Check the MRTG-Site-Map.

What is MRTG ()
       A short overview on what MRTG is, with additional sections on history, and highlights.

License & MRTG Appreciators

MRTG is freely available under the terms of the GNU General Public License

MRTG Appreciators
       I spend a lot of my time maintaining MRTG, answering user requests and writing other open source software packages. I keep a list of people who have shown their appreciation for my work. For example by ordering CD or DVD media from my wish list.

Start Using MRTG

Download MRTG
       Get the latest Version of MRTG

What is NEW
       The MRTG CHANGES file will give you all the details.

UNIX MRTG Installation Guide ()
       If you plan to run mrtg on a unix machine (this is what I do). Then this guide will explain all the details about compiling and configuring the system.

Win32 MRTG Installation Guide ()
       A fair number of people run MRTG successfully on Windows NT and 2k platforms. This guide shows you how this is done. If you insist on running MRTG on the Windows 95/98/ME spawns make friends with Jeff Liebermann or rather his MRTG for Windows 95, 98, and ME webpage.

MRTG User Pages
       A large number of people are using MRTG all around the world. On these pages you find links to MRTG Companion Websites, compatibility and customer lists

MRTG Documentation Pack

CfgMaker Manual ()
       MRTG configuration files can be generated automatically using the cfgmaker.

IndexMaker Manual ()
       Index maker generates an overview page giving you the big picture on all the targets you are monitoring.

MRTG Configuration Reference ()
       The Installation guides above will give you a glimpse at what is possible with MRTG. But to get the full picture take a look at the configuration reference which explains all the configuration options available in MRTG.

       Answers to Frequently Asked Questions regarding MRTG. And a pointer to the official 'Inofficial MRTG FAQ'

MRTG Newsgroup and Mailiglist ()
       Sometimes you just can't seem to find an answer to your MRTG problems even when spending a lot of time reading the documentation. Then it is best ask someone who can help.

Advanced User Information

Contribution Guidelines ()
       If you plan on contributing code to the MRTG project, please make sure you follow the guide lines listed in this document.

       Want to write your own monitoring application? Need more powerful graphing? Want to store non integer data? Need more speed? Make sure to check out my latest creation: RRDtool.

RRDtool Integration ()
       MRTG can be used together with RRDtool. Lifting it up to a new level of performance and flexibility.

MRTG Logfile Format ()
       Some people want to use the data stored in the mrtg log files with programs of their own. Learn about the format of the MRTG log files.

MRTG_lib Perl Module ()
       Parts of mrtg have been broken out into a Perl module called Nothing beautiful, but at least there is some documentation for it. If you want to write something which parses the mrtg configuration file then this might be very useful.

MIB Help ()
       Looking at Traffic rates is interesting, but your router can tell you much more. Use this document to get started.

SQUID Monitoring ()
       An Introduction on Using MRTG to monitor a SQUID web cache

Webserver Configuration Hints ()
       Your web server is vital in making mrtg generated web pages and graphs available to your customers. This document gives some hints on how optimize your web server regarding mrtg.


If you have any questions about this program, or have it up and running,
we would like to hear from you:

Tobias Oetiker <> and Dave Rand <>