.\" Copyright (c) 2003-2004 Apple Computer, Inc. All Rights Reserved. .\" .\" @APPLE_LICENSE_HEADER_START@ .\" .\" This file contains Original Code and/or Modifications of Original Code .\" as defined in and that are subject to the Apple Public Source License .\" Version 2.0 (the 'License'). You may not use this file except in .\" compliance with the License. Please obtain a copy of the License at .\" http://www.opensource.apple.com/apsl/ and read it before using this .\" file. .\" .\" The Original Code and all software distributed under the License are .\" distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER .\" EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, .\" INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, .\" FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. .\" Please see the License for the specific language governing rights and .\" limitations under the License. .\" .\" @APPLE_LICENSE_HEADER_END@ .\" .\" $Log: mDNSResponder.8,v $ .\" Revision 1.4 2004/05/18 18:14:36 cheshire .\" Minor wording update .\" .\" Revision 1.3 2004/04/22 02:56:08 cheshire .\" : mDNSResponder man page format error .\" .\" Revision 1.2 2004/04/12 18:03:24 ksekar .\" : mDNSResponder man page format error .\" .\" Revision 1.1 2003/11/13 03:21:38 cheshire .\" : No man page for mDNSResponder .\" .\" .\" .Dd April 2004 \" Date .Dt mDNSResponder 8 \" Document Title .Os Darwin \" Operating System .\" .Sh NAME .Nm mDNSResponder .Nd Multicast DNS daemon \" Name Description for whatis database .\" .Sh SYNOPSIS .Nm .\" .Sh DESCRIPTION .Nm is a daemon invoked at boot time to implement Multicast DNS and DNS Service Discovery. .Pp .Nm listens UDP port 5353 for Multicast DNS Query packets. When it receives a query for which it knows an answer, .Nm issues the appropriate Multicast DNS Reply packet. .Pp .Nm also performs Multicast DNS Queries on behalf of client processes, and maintains a cache of the replies. .Pp .Nm has no user-specifiable command-line argument, and users should not run .Nm manually. .Pp To examine .Nm Ns 's internal state, for debugging and disagnostic purposes, send it a SIGINFO signal, and it will then dump a snapshot summary of its internal state to .Pa /var/log/system.log Ns , e.g. .Pp .Dl sudo killall -INFO mDNSResponder .Sh FILES .Pa /usr/sbin/mDNSResponder \" Pathname .\" .Sh SEE ALSO .Xr mDNS 1 .Pp For information on Multicast DNS, see .Pa http://www.multicastdns.org/ .Pp For information on DNS Service Discovery, see .Pa http://www.dns-sd.org/ .Pp For information on how to use the Multicast DNS and the DNS Service Discovery APIs on Mac OS X and other platforms, see .Pa http://developer.apple.com/macosx/rendezvous/ .Pp For the source code to .Nm , see .Pa http://developer.apple.com/darwin/projects/rendezvous/ .\" .Sh BUGS .Nm bugs are tracked in Apple Radar component "mDNSResponder". .\" .Sh HISTORY The .Nm daemon first appeared in Mac OS X 10.2 (Jaguar). .Pp Also available from the Darwin open source repository (though not officially supported by Apple) are .Nm daemons for other platforms, including Mac OS 9, Microsoft Windows, Linux, FreeBSD, NetBSD, Solaris, and other POSIX systems.