SNMP server configuration
Firstly, you need an SNMP server to provide network interface statstics on demand:
# apt-get install snmpd
You need to edit the configuration for this as it does not allow any connections by default. With your favourite editor, edit:
/etc/snmp/snmpd.conf
Comment out the following (prefix with #):
com2sec paranoid default public
Insert the following underneath the commented out section:
com2sec readonly default public
That gives anyone with access to the SNMP server read-only access to the public community. This is the one that contains the interface statistics.
To apply the changes, restart snmpd:
/etc/init.d/snmpd restart
Make sure you firewall off any SNMP related ports so that you don't get any unwanted visitors (check netstat and /etc/services for port information).
Installation of MRTG
MRTG is the main collection and graphing component of the traffic monitoring solution I am presenting here. Firstly, install MRTG:
# apt-get install mrtg
You can manually or automatically generate the configuration file for mrtg. I would recommend doing it automatically as it is a lot easier. Issue the following command:
# cfgmaker --global 'WorkDir: /var/www/mrtg' \
--output /etc/mrtg.cfg public@127.0.0.1
This will generate the configuration file. You then need to make an index file which contains a list of all of your interfaces. Issue the following command:
# indexmaker /etc/mrtg.cfg --columns=1 \
--output /var/www/mrtg/index.html
You will now need to execute mrtg manually 3 times to create the required database files. Issue the following command 3 times sequentially. On the third run, you should see no errors being reported:
# mrtg
This is executed every 5 minutes by cron. The cron job was added by dpkg for you so you do not have to configure it.
Conclusion
Finally, inspect your results! You will not see any reasonable graphs for quite some time so sit back end relax for a bit!
Browse to http://your-server-name/mrtg/
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