The bundled documentation on your system is a good place to start
looking for additional TCP Wrappers, xinetd, and
access control configuration options.
/usr/share/doc/tcp_wrappers-<version>/
— This directory contains a README file
that discusses how TCP wrappers work and the various hostname and
host address spoofing risks that exist.
/usr/share/doc/xinetd-<version>/
— This directory contains a README file
that discusses aspects of access control and a
sample.conf file with various ideas for
modifying service-specific configuration files in the
/etc/xinetd.d/ directory.
TCP wrappers and xinetd related man pages
— There are a number of man pages for the various
applications and configuration files involved with TCP wrappers
and xinetd. The following lists some of
the more important man pages.
Server Applications
man xinetd — The man page
for the xinetd super service daemon.
Configuration Files
man 5 hosts_access — The man page for
the TCP wrappers hosts access control files.
man hosts_options — The man page for
the TCP wrappers options fields.
man xinetd.conf — The man page listing
xinetd configuration options.
Red Hat Enterprise Linux Security Guide;
Red Hat, Inc. — Provides an overview of workstation, server,
and network security with specific suggestions regarding TCP
wrappers and xinetd.
Hacking Linux Exposed by Brian Hatch,
James Lee, and George Kurtz; Osbourne/McGraw-Hill — An
excellent security resource with featuring information about TCP
wrappers and xinetd.
