Sasacct fetches traffic stats via ipchains, ipfstat, iptables, pf,
Cisco IP accounting, and SNMP. It makes mrtg-like graphics using
rrdtool. A CGI interface is included for checking date-to-date traffic
statistics and to generate on-the-fly graphics. It also includes
support for fetching the necessary information remotely via a
super-server (such as inetd or xinetd).
