This program collects headers of IP packets that travel through the Linux 2.4+ netfilter.
It writes accounting information to a log which can include protocol type, source/destination address, port information, byte and packet count, incoming/outgoing network interfaces.
Records in the accounting logfile are freely configurable via a format string, for example it is possible to mimic the output format of Cisco's "ip accounting output-packets" or to generate SQL statements that can be fed directly into a DBMS.