tcpd
TCP Wrapper, commonly known as tcpd, is a host-based network access control system that allows administrators to restrict access to network services based on the originating IP address. It acts as a front-end for many common network daemons, such as telnetd, ftpd, and rshd, by intercepting connection requests before they reach the actual service.
The functionality of tcpd is controlled by two configuration files: hosts.allow and hosts.</strong>allow. These files specify
For example, a rule in hosts.allow might permit all connections from a specific IP address to the
TCP Wrapper is written in C and is typically installed as a shared library or as a