the original mDNSResponder.8 manpage, for reference
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external/apache2/mDNSResponder/usr.sbin/mdnsd/mdnsd.8
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.\" -*- tab-width: 4 -*-
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.\"
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.\" Copyright (c) 2003-2004 Apple Computer, Inc. All Rights Reserved.
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.\"
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.\" Licensed under the Apache License, Version 2.0 (the "License");
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.\" you may not use this file except in compliance with the License.
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.\" You may obtain a copy of the License at
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.\"
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.\" http://www.apache.org/licenses/LICENSE-2.0
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.\"
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.\" Unless required by applicable law or agreed to in writing, software
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.\" distributed under the License is distributed on an "AS IS" BASIS,
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.\" WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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.\" See the License for the specific language governing permissions and
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.\" limitations under the License.
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.\"
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.\" Log: mDNSResponder.8,v $
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.\" Revision 1.10 2009/04/20 16:12:13 mcguire
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.\" <rdar://problem/6807798> manpage: roff errors
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.\"
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.\" Revision 1.9 2009/04/11 00:20:27 jessic2
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.\" <rdar://problem/4426780> Daemon: Should be able to turn on LogOperation dynamically
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.\"
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.\" Revision 1.8 2006/10/06 17:31:33 mkrochma
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.\" <rdar://problem/4769407> Typo in man page for mDNSResponder(8)
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.\"
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.\" Revision 1.7 2006/08/14 23:24:56 cheshire
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.\" Re-licensed mDNSResponder daemon source code under Apache License, Version 2.0
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.\"
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.\" Revision 1.6 2005/02/10 22:35:28 cheshire
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.\" <rdar://problem/3727944> Update name
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.\"
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.\" Revision 1.5 2004/06/29 02:41:38 cheshire
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.\" Add note that mDNSResponder is called mdnsd on some systems
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.\"
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.\" Revision 1.4 2004/05/18 18:14:36 cheshire
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.\" Minor wording update
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.\"
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.\" Revision 1.3 2004/04/22 02:56:08 cheshire
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.\" <rdar://problem/3619494>: mDNSResponder man page format error
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.\"
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.\" Revision 1.2 2004/04/12 18:03:24 ksekar
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.\" <rdar://problem/3619494>: mDNSResponder man page format error
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.\"
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.\" Revision 1.1 2003/11/13 03:21:38 cheshire
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.\" <rdar://problem/3086886>: No man page for mDNSResponder
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.\"
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.\"
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.\"
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.Dd April 2004 \" Date
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.Dt mDNSResponder 8 \" Document Title
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.Os Darwin \" Operating System
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.\"
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.Sh NAME
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.Nm mDNSResponder
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.Nd Multicast and Unicast DNS daemon \" Name Description for whatis database
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.\"
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.Sh SYNOPSIS
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.Nm
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.\"
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.Sh DESCRIPTION
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.Nm
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(also known as
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.Nm mdnsd
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on some systems)
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is a daemon invoked at boot time to implement Multicast DNS and DNS Service Discovery. On
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Mac OS X 10.6 (Snow Leopard),
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.Nm
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is also the system-wide Unicast DNS Resolver.
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.Pp
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.Nm
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listens on UDP port 5353 for Multicast DNS Query packets.
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When it receives a query for which it knows an answer,
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.Nm
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issues the appropriate Multicast DNS Reply packet.
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.Pp
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.Nm
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also performs Unicast and Multicast DNS Queries on behalf of client processes, and
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maintains a cache of the replies.
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.Pp
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.Nm
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has no user-specifiable command-line argument, and users should not run
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.Nm
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manually.
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.Pp
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.Ss LOGGING
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There are several methods with which to examine
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.Nm Ns 's internal state for debugging and diagnostic purposes. The syslog(1)
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logging levels map as follows:
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.Pp
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.Dl Error - Error messages
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.Dl Warning - Client-initiated operations
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.Dl Notice - Sleep proxy operations
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.Dl Info - Informational messages
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.Pp
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By default, only log level Error is logged.
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.Pp
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A SIGUSR1 signal toggles additional logging, with Warning and Notice
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enabled by default:
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.Pp
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.Dl % sudo killall -USR1 mDNSResponder
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.Pp
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Once this logging is enabled, users can additionally use syslog(1)
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to change the log filter for the process. For example, to enable log levels Emergency - Debug:
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.Pp
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.Dl % sudo syslog -c mDNSResponder -d
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.Pp
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A SIGUSR2 signal toggles packet logging:
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.Pp
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.Dl % sudo killall -USR2 mDNSResponder
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.Pp
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A SIGINFO signal will dump a snapshot summary of the internal state to
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.Pa /var/log/system.log Ns :
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.Pp
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.Dl % sudo killall -INFO mDNSResponder
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.Sh FILES
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.Pa /usr/sbin/mDNSResponder \" Pathname
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.\"
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.Sh SEE ALSO
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.Xr mDNS 1
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.Pp
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For information on Multicast DNS, see
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.Pa http://www.multicastdns.org/
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.Pp
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For information on DNS Service Discovery, see
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.Pa http://www.dns-sd.org/
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.Pp
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For information on how to use the Multicast DNS and the
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DNS Service Discovery APIs on Mac OS X and other platforms, see
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.Pa http://developer.apple.com/bonjour/
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.Pp
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For the source code to
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.Nm , see
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.Pa http://developer.apple.com/darwin/projects/bonjour/
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.\"
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.Sh BUGS
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.Nm
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bugs are tracked in Apple Radar component "mDNSResponder".
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.\"
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.Sh HISTORY
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The
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.Nm
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daemon first appeared in Mac OS X 10.2 (Jaguar).
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.Pp
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Also available from the Darwin open source repository
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(though not officially supported by Apple) are
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.Nm
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daemons for other platforms, including Mac OS 9, Microsoft Windows,
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Linux, FreeBSD, NetBSD, Solaris, and other POSIX systems.
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