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inetd is a super-server daemon on many Unix systems that manages Internet services. More at
Wikipedia
TCP Wrapper - TCP Wrapper is a host-based Networking ACL system, used to filter network access to Internet Protocol servers on operating systems such as Linux or BSD. It allows host or subnetwork IP addresses...
Xinetd - In computer networking, xinetd, the eXtended InterNET Daemon, is an open-source super-server daemon which runs on many Unix-like systems and manages Internet-based connec...
