From LQWiki
tcp-wrappers, aka TCP Wrapper, aka tcpwrappers. A standard package to filter/log incoming TCP requests, and either pass them onto their intended daemon, or otherwise deal with the request.
On Debian, see:
apt-cache show tcpd
and some docs are in
/usr/share/doc/tcpd
tcp-wrappers was originally written by Wietse Venema, the same fellow who created postfix, The Coroner's Toolkit (TCT), and SATAN -- among other tools.
External links:
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