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How to use mrtg to
monitor traffic on your
wireless and wired network
a bella mia company
A Little Background
Josh Easton
CTO at Bella Mia, Inc.
Been an ISP for 8 years
In our 4th year as a WISP
Part-15 WISP of the Year WISPCON III
Part-15 Member
Regular Speaker at WISPCON.
Located in South East Wisconsin
How do you know what your
customers are doing?
Why should I monitor traffic?
To determine how much of your network
capacity is left
Collect statistics on what your average
customer needs for bandwidth
Allows you to tell customers when they
should buy more bandwidth from you
Helps when diagnosing problems
How does mrtg work
Collects data via SNMP
Record`s an interface`s traffic
counters every 5 minutes
Places data in a fixed-size log
Creates graphs, updates web page
What is SNMP?
Simple Network Management Protocol
UDP based, port 161
Community name functions as a password
Many implementations allow access
control via IP address
What do I need to run mrtg
Under Windows NT/2000:
Mrtg itself
ActivePerl
FireDaemon
Under Unix:
Mrtg package or source code
Perl, standard on almost all systems
What else do I need?
Devices that support snmp
A web server to host the page generated
by mrtg
How to set it up
Set up devices you want to monitor
Configure community names, allow machine running mrtg to
monitor it
Install mrtg and support software
Create a configuration
By hand with a text editor
Using cfgmaker script
Or a combination of both
Test out configuration
Setup automated process to run mrtg periodically
Create a cron job or background process
Now for some examples
Questions?
Presentation presented and created by
Josh Easton
Thank you for your attention!
A PPT copy of the presentation can also be found online at:
http://wispconv.mia.net/ppt/mrtg.ppt
a bella mia company