"Well Known" TCP and UDP ports used by Apple software products

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LEARN ABOUT NETBSD

mdnsd

MDNSD(8)						    BSD System Manager's Manual 						  MDNSD(8)

NAME

     mdnsd -- Multicast and Unicast DNS daemon

SYNOPSIS

     mdnsd

DESCRIPTION

     mdnsd (also known as mDNSResponder on some systems) is a daemon invoked at boot time to implement Multicast DNS and DNS Service Discovery.
     On Mac OS X 10.6 (Snow Leopard), mdnsd is also the system-wide Unicast DNS Resolver.

     mdnsd listens on UDP port 5353 for Multicast DNS Query packets.  When it receives a query for which it knows an answer, mdnsd issues the
     appropriate Multicast DNS Reply packet.

     mdnsd also performs Unicast and Multicast DNS Queries on behalf of client processes, and maintains a cache of the replies.

     mdnsd has no user-specifiable command-line argument, and users should not run mdnsd manually.

   LOGGING
     There are several methods with which to examine mdnsd's internal state for debugging and diagnostic purposes.  The syslogd(8) logging levels
     map as follows:

	   Error - Error messages
	   Warning - Client-initiated operations
	   Notice - Sleep proxy operations
	   Info - Informational messages

     By default, only log level Error is logged.

     A SIGUSR1 signal toggles additional logging, with Warning and Notice enabled by default:

	   # pkill -USR1 mdnsd

     A SIGUSR2 signal toggles packet logging:

	   # pkill -USR2 mdnsd

     A SIGINFO signal will dump a snapshot summary of the internal state to /var/log/system.log:

	   # pkill -INFO mdnsd

FILES

     /usr/sbin/mdnsd

SEE ALSO

     dns-sd(1), pkill(1), syslogd(8)

     For information on Multicast DNS, see http://www.multicastdns.org/

     For information on DNS Service Discovery, see http://www.dns-sd.org/

     For information on how to use the Multicast DNS and the DNS Service Discovery APIs on Mac OS X and other platforms, see
     http://developer.apple.com/bonjour/

     For the source code to mdnsd, see http://developer.apple.com/darwin/projects/bonjour/

HISTORY

     The mdnsd daemon first appeared in Mac OS X 10.2 (Jaguar).

     Also available from the Darwin open source repository (though not officially supported by Apple) are mdnsd daemons for other platforms,
     including Mac OS 9, Microsoft Windows, Linux, FreeBSD, NetBSD, Solaris, and other POSIX systems.

BUGS

     mdnsd bugs are tracked in Apple Radar component "mDNSResponder".

BSD
								 February 27, 2011							       BSD

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