The tcpwrappers replace a number of "listening" daemons with a single "master" daemon that listens for service requests for several common services on the system. When a request for a service is made the tcpwrapper (tcpd) "wakes" the daemon for that service. This does two things. It saves on system resources, since only one process needs to be running. It also gives more fine grained control over who will be allowed to access services through access control lists. The daemons that tcpwrappers "listens" for are all servers listed in /etc/inetd.conf.

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