iptotal is an *extremly* simple network monitor tool that measures the number of IP packages traveling to/from a specific network interface. It is based on a packet sniffer using libcap, so it does not require SNMP. Using Tobi Oetiker's rrdtool it can create 2hr, daily, weekly, monthly and yearly graphs. It maintains an archive of the last 30 daily graphs. It was specifically written for a FREESCO router (http://www.freesco.org) but can be ported to other Linux distros.
