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