An application-level gateway server.

A protocol analyzer that supports ethernet, Token Ring, SLIP, PPP, ISDN, and loopback.

icmpquery is a tool for sending and receiving ICMP queries for the destinations address mask and current time.

Strong user authentication and access control for Linux environments in a fully integrated system using PAM modules.

Adds the ability for a network administrator to set packet filtering rules via a web page interface. unsecure from an external source, but very easy to use for intranet management.

A Crypto IP Encapsulation project. Offers a protocol that passes encrypted packets between prearranged routers in the form of UDP packets.

A set of network diagnostic tools, such as an enhanced replacement for traceroute.

Linux Pluggable Authentication Modules (PAM) is a flexible mechanism for authenticating users using alternative authentication schemes.

A network scanner that detects Microsoft Windows shares using the SMB protocol.