mDNSResponder

mDNSResponder

mDNSResponder — Multicast DNS daemon

SYNOPSIS

mDNSResponder

DESCRIPTION

mDNSResponder (also known as mdnsd on some systems) is a daemon invoked
at boot time to implement Multicast 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 disagnostic
purposes, send it a SIGINFO signal, and it will then dump a snapshot sum-
mary 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 Dis-
covery APIs on Mac OS X and other platforms, see
https://developer.apple.com/bonjour/index.html
For the source code to mDNSResponder, see
https://developer.apple.com/opensource/

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 offi-
cially supported by Apple) are mDNSResponder daemons for other platforms,
including Mac OS 9, Microsoft Windows, Linux, FreeBSD, NetBSD, Solaris,
and other POSIX systems.

EOF

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