1.\" -*- tab-width: 4 -*- 2.\" 3.\" Copyright (c) 2003-2004 Apple Computer, Inc. All Rights Reserved. 4.\" 5.\" Licensed under the Apache License, Version 2.0 (the "License"); 6.\" you may not use this file except in compliance with the License. 7.\" You may obtain a copy of the License at 8.\" 9.\" http://www.apache.org/licenses/LICENSE-2.0 10.\" 11.\" Unless required by applicable law or agreed to in writing, software 12.\" distributed under the License is distributed on an "AS IS" BASIS, 13.\" WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14.\" See the License for the specific language governing permissions and 15.\" limitations under the License. 16.\" 17.\" Copyright 2016 Toomas Soome <tsoome@me.com> 18.\" 19.Dd Jan 28, 2016 \" Date 20.Dt MDNSD 8 \" Document Title 21.Os illumos \" Operating System 22.\" 23.Sh NAME 24.Nm mdnsd 25.Nd Multicast and Unicast DNS daemon \" Name Description for whatis database 26.\" 27.Sh SYNOPSIS 28.Nm 29.\" 30.Sh DESCRIPTION 31.Nm 32(also known as 33.Nm mDNSResponder 34on some systems) 35is a daemon invoked at boot time to implement Multicast DNS and DNS Service Discovery. 36.Pp 37.Nm 38listens on UDP port 5353 for Multicast DNS Query packets. 39When it receives a query for which it knows an answer, 40.Nm 41issues the appropriate Multicast DNS Reply packet. 42.Pp 43.Nm 44also performs Unicast and Multicast DNS Queries on behalf of client processes, and 45maintains a cache of the replies. 46.Pp 47.Nm 48has no user-specifiable command-line argument, and users should not run 49.Nm 50manually. 51.Sh LOGGING 52There are several methods with which to examine 53.Nm Ns 's internal state for debugging and diagnostic purposes. The syslog(3C) 54logging levels map as follows: 55.Pp 56.Dl Error - Error messages 57.Dl Warning - Client-initiated operations 58.Dl Notice - Sleep proxy operations 59.Dl Info - Informational messages 60.Pp 61By default, only log level Error is logged. 62.Pp 63A SIGUSR1 signal toggles additional logging, with Warning and Notice 64enabled by default: 65.Pp 66.Dl % sudo pkill -USR1 mdnsd 67.Pp 68A SIGUSR2 signal toggles packet logging: 69.Pp 70.Dl % sudo pkill -USR2 mdnsd 71.Pp 72A SIGINFO signal will dump a snapshot summary of the internal state: 73.Pp 74.Dl % sudo pkill -INFO mdnsd 75.Sh FILES 76.Pa /usr/lib/inet/mdnsd \" Pathname 77.\" 78.Sh INFO 79For information on Multicast DNS, see 80.Pa http://www.multicastdns.org/ 81.Pp 82For information on DNS Service Discovery, see 83.Pa http://www.dns-sd.org/ 84.Pp 85For information on how to use the Multicast DNS and the 86DNS Service Discovery APIs on Mac OS X and other platforms, see 87.Pa http://developer.apple.com/bonjour/ 88.Pp 89For the source code to 90.Nm , see 91.Pa http://developer.apple.com/darwin/projects/bonjour/ 92.\" 93.Sh INTERFACE STABILITY 94.Sy Volatile . 95.Sh SEE ALSO 96.Xr dns-sd 8 97.\" 98.Sh NOTES 99The 100.Nm 101service is managed by the service management facility, 102\fBsmf\fR(7), under the service identifier: 103.sp 104.Dl svc:/network/dns/multicast:default 105.sp 106Administrative actions on this service, such as enabling, disabling, or 107requesting restart, can be performed using \fBsvcadm\fR(8). The service's 108status can be queried using the \fBsvcs\fR(1) command. 109