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Xinetd or eXtended InterNET services daemon starts processes and does so by listening to ports and then starting a service when requested rather than before it is actually needed. It provides a level of security by supplying access control and security for Linux and other UNIX-like systems based on the IP address they originate from. For example, when a request
comes to a given port, xinetd passes the request to another program, tcpd, which can then look at the /etc/hosts.allow and /etc/hosts.deny files and determine if traffic from and to that IP address is allowable based on a list of access rules.
Quagga is similar in the net effect of allowing access, but it is a multi-server routing software that runs on numerous Unixes
including FreeBSD, Solaris, NetBSD and Linux. Where xinetd is a single daemon, quagga is a collection of daemons that construct a routing table and provide a level of routing security rather than than allowing access via a
single server running xinetd.
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