.\" Copyright (c) 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: dnsextd.8,v $
.\" Revision 1.1  2004/08/15 18:49:18  cheshire
.\" <rdar://problem/3763030> No man page for dnsextd
.\"
.\"
.\"
.Dd August 2004             \" Date
.Dt dnsextd 8               \" Document Title
.Os Darwin                  \" Operating System
.\"
.Sh NAME
.Nm dnsextd
.Nd BIND Extension Daemon   \" Name Description for whatis database
.\" 
.Sh SYNOPSIS
.Nm
.\"
.Sh DESCRIPTION
.Nm
is a daemon invoked at boot time, running alongside BIND 9,
to implement two EDNS0 extensions to the standard DNS protocol.
.Pp
.Nm
allows clients to perform DNS Updates with an attached lease lifetime,
so that if the client crashes or is disconnected from the network, its
address records will be automatically deleted after the lease expires.
.Pp
.Nm
allows clients to perform long-lived queries. Instead of rapidly polling
the server to discover when information changes, long-lived queries
enable a client to indicate its interest in some set of data, and then
be notified asynchronously by the server whenever any of that data changes.
.Pp
.Nm
has no user-specifiable command-line argument, and users should not run
.Nm
manually.
.\"
.Sh SEE ALSO
.Xr mDNS 1
.Xr mDNSResponder 8
.Pp
For information on Dynamic DNS Update, see RFC 2136
"Dynamic Updates in the Domain Name System (DNS UPDATE)"
.Pp
For information on Dynamic DNS Update Leases, see
.Pa http://files.dns-sd.org/draft-dns-update-leases.txt
.Pp
For information on Long-Lived Queries, see
.Pa http://files.dns-sd.org/draft-dns-llq.txt
.\"
.Sh BUGS
.Nm
bugs are tracked in Apple Radar component "mDNSResponder".
.\"
.Sh HISTORY
The
.Nm
daemon first appeared in Mac OS X 10.4 (Tiger).