Version 1.4.7

Network-I is a free network analyser suite, released under the Grey Binary Licence, that runs under Unix and does not require any specialised hardware.
It comprises a fast packet sniffer (Niftap) and a suite of additional tools (primarily Nifpan) that collectively perform the following main functions: Network-I employs a powerful filtering language that allows you to zero in on relevant services and interesting packets, and employs kernel-level filtering, for optimum performance.

The packet analyser can interpret a wide range of TCP/IP protocols (ie. IP and TCP themselves, plus ICMP, DNS, RIP, BOOTP, DHCP, RADIUS, SNMP, NFS, LDAP, OSPF, etc), as well as a wide variety of underlying link protocols (such as Ethernet, FDDI, LLC, SNAP).