"The rtr-graph package described in this article is a set of Perl scripts for polling routers (or other SNMP-enabled devices) for information about traffic in and out of specified interfaces. You can set up "rtr-traff" as a cron job to poll the interface at a specified interval, then use a CGI script for a Web front end to the finished graphs. The Web interface automatically sorts results from different devices into separate drop-down lists. You can also set up multiple config files to poll different devices, change final graph specs, and set up new parameters. This concept was originally designed to check our Internet T1 interface for traffic levels during the day. It has since evolved into a versatile program that gathers statistics from any device to check problems, get baselines, or just see what's going on."