Permits a system administrator to control access by hosts to service daemons initiated by inetd, in.rexecd, in.rlogind, in. telnetd, and in. tftpd. In UNIX and Linux systems, a system administrator can configure a data packet filter on the Internet gateway to limit what packet types are permitted access to networks and what packets are permitted to leave, thus increasing the network’s security against exploits. Another method of controlling access to Internet services is by using TCP wrappers. The Santa Cruz Operation, Inc. TCP Wrappers. [Online, November 5, 1999.] The Santa Cruz Operation, Inc. Website. http://docsrv.sco.com/NET_tcpip/filterN.tcp_ wrappers.html.