| MDNSD(8) | System Manager's Manual | MDNSD(8) | 
mdnsd —
| mdnsd | 
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.
mdnsd's
  internal state for debugging and diagnostic purposes. The
  syslogd(8) logging levels map
  as follows:
Error - Error messagesWarning - Client-initiated
  operationsNotice - Sleep proxy
  operationsInfo - Informational
  messagesBy default, only log level Error is logged.
A SIGUSR1 signal toggles additional logging, with Warning and Notice enabled by default:
# pkill -USR1 mdnsdA SIGUSR2 signal toggles packet logging:
# pkill -USR2 mdnsdA SIGINFO signal will dump a snapshot summary of the internal state to /var/log/system.log:
# pkill -INFO mdnsdFor 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/
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.
mdnsd bugs are tracked in Apple Radar component
  "mDNSResponder".
| February 27, 2011 | NetBSD 9.4 |