SNMP MRTG

1. Introduction

In this text is described how to configure Mikrotik RouterOS and mrtg (FreeBSD). You must be root on nix mashine and ports collection is installed. Web server must be configured and running on BSD mashine. In this example Web server is Apache server. All information about mrtg and apache can be found at homepages: http://www.mrtg.org http://www.apache.org

2. RouterOS SNMP Configuration

/ snmp 
set enabled=yes contact="your@mail.com" location="SomeCountry" 
/ snmp community 
set public name="public" address=192.168.0.5/32 read-access=yes

Ip address 192.168.0.5 is address of BSD mashine where mrtg will be installed.

2. MRTG Installation and Configuration

Now we install and configure mrtg on BSD mashine. 
cd /usr/ports/net-mgmt/
make 
make install
Now we need to create configuration file for mrtg. It can be done automatically by cfgmaker program.192.168.0.1 is ip of RouterOS.
cfgmaker public@192.168.0.1 --output=/usr/local/etc/mrtg.cfg

Change WorkDir value in created mrtg file with text editor. WorkDir value specifies where html files will be created.
It must be same as DocumentRoot value in apache configuration.

For example: 

### Global Config Options

#  for UNIX
WorkDir: /usr/local/www/data/


### Global Defaults

#  to get bits instead of bytes and graphs growing to the right
Options[_]: growright, bits

EnableIPv6: no

######################################################################
# System: Mikrotik
# Description: router
# Contact: your@mail.com
# Location: SomeCountry
######################################################################

Execute mrtg with your config to create html files.
mrtg /usr/local/etc/mrtg.cfg 
Now in directory /usr/local/www/data are html files for every interface in MT.
Add this string to crontab to update graphs automatically every 5 minutes
*/5     *       *       *       *       root    mrtg /usr/local/etc/mrtg.cfg
Now we can create 1 html file with graphs for all interfaces
indexmaker /usr/local/etc/mrtg.cfg --output=/usr/local/www/data/index.html


Here is a sample configuration to monitor the power on a RB333 router using MRTG and SNMP
plotting the results with the correct scale and values:

This should be entered into an existing mrtg.conf file replacing IP_Address with your IP address and MT with your community string

### Input Voltage

Target[IP_Address-voltage]:.1.3.6.1.4.1.14988.1.1.3.8.0&.1.3.6.1.4.1.14988.1.1.3.8.0:MT@IP_Address
AbsMax[IP_Address-voltage]: 200
MaxBytes[IP_Address-voltage]: 200
Title[IP_Address-voltage]: Input Voltage for a monitored -333
PageTop[IP_Address-voltage]: 
Input Voltage RB333 being monitored 
 

   
System:
     
RB333 being monitored
   
Maintainer:
 
managee
   
Description:
Voltage for Monitored 333 
 
Options[IP_Address-voltage]: gauge,growright,nopercent, noo, expscale
YLegend[IP_Address-voltage]: Volts
YTicsFactor[IP_Address-voltage]: 0.1
Factor[IP_Address-voltage]: 0.1
ShortLegend[IP_Address-voltage]: V
LegendI[IP_Address-voltage]: Input Voltage &nbsp