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

NAME
     mDNSResponder -- Multicast DNS daemon

SYNOPSIS
     mDNSResponder

DESCRIPTION
     mDNSResponder (also known as mdnsd on some systems) is a daemon invoked at boot time to implement Mul-ticast Multicast
     ticast DNS and DNS Service Discovery.

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

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

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

     To examine mDNSResponder's internal state, for debugging and diagnostic purposes, send it a SIGINFO
     signal, and it will then dump a snapshot summary of its internal state to /var/log/system.log, e.g.

           sudo killall -INFO mDNSResponder

FILES
     /usr/sbin/mDNSResponder

SEE ALSO
     mDNS(1)

     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 mDNSResponder, see http://developer.apple.com/darwin/projects/bonjour/

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

HISTORY
     The mDNSResponder 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
     mDNSResponder daemons for other platforms, including Mac OS 9, Microsoft Windows, Linux, FreeBSD,
     NetBSD, Solaris, and other POSIX systems.

Darwin                           April 2, 2008                          Darwin