1.\" -*- tab-width: 4 -*-
2.\"
3.\" Copyright (c) 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.Dd August 2004             \" Date
18.Dt dnsextd 8               \" Document Title
19.Os Darwin                  \" Operating System
20.\"
21.Sh NAME
22.Nm dnsextd
23.Nd BIND Extension Daemon   \" Name Description for whatis database
24.\"
25.Sh SYNOPSIS
26.Nm
27.\"
28.Sh DESCRIPTION
29.Nm
30is a daemon invoked at boot time, running alongside BIND 9,
31to implement two EDNS0 extensions to the standard DNS protocol.
32.Pp
33.Nm
34allows clients to perform DNS Updates with an attached lease lifetime,
35so that if the client crashes or is disconnected from the network, its
36address records will be automatically deleted after the lease expires.
37.Pp
38.Nm
39allows clients to perform long-lived queries. Instead of rapidly polling
40the server to discover when information changes, long-lived queries
41enable a client to indicate its interest in some set of data, and then
42be notified asynchronously by the server whenever any of that data changes.
43.Pp
44.Nm
45has no user-specifiable command-line argument, and users should not run
46.Nm
47manually.
48.\"
49.Sh SEE ALSO
50.Xr mDNS 1
51.Xr mDNSResponder 8
52.Pp
53For information on Dynamic DNS Update, see RFC 2136
54"Dynamic Updates in the Domain Name System (DNS UPDATE)"
55.Pp
56For information on Dynamic DNS Update Leases, see
57.Pa http://files.dns-sd.org/draft-dns-update-leases.txt
58.Pp
59For information on Long-Lived Queries, see
60.Pa http://files.dns-sd.org/draft-dns-llq.txt
61.\"
62.Sh BUGS
63.Nm
64bugs are tracked in Apple Radar component "mDNSResponder".
65.\"
66.Sh HISTORY
67The
68.Nm
69daemon first appeared in Mac OS X 10.4 (Tiger).
70