| 1 | .\" -*- tab-width: 4 -*- |
|---|
| 2 | .\" |
|---|
| 3 | .\" Copyright (c) 2004, 2006, 2009 Apple 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 |
|---|
| 30 | is a daemon invoked at boot time, running alongside BIND 9, |
|---|
| 31 | to implement two EDNS0 extensions to the standard DNS protocol. |
|---|
| 32 | .Pp |
|---|
| 33 | .Nm |
|---|
| 34 | allows clients to perform DNS Updates with an attached lease lifetime, |
|---|
| 35 | so that if the client crashes or is disconnected from the network, its |
|---|
| 36 | address records will be automatically deleted after the lease expires. |
|---|
| 37 | .Pp |
|---|
| 38 | .Nm |
|---|
| 39 | allows clients to perform long-lived queries. Instead of rapidly polling |
|---|
| 40 | the server to discover when information changes, long-lived queries |
|---|
| 41 | enable a client to indicate its interest in some set of data, and then |
|---|
| 42 | be notified asynchronously by the server whenever any of that data changes. |
|---|
| 43 | .Pp |
|---|
| 44 | .Nm |
|---|
| 45 | has no user-specifiable command-line argument, and users should not run |
|---|
| 46 | .Nm |
|---|
| 47 | manually. |
|---|
| 48 | .\" |
|---|
| 49 | .Sh SEE ALSO |
|---|
| 50 | .Xr mDNS 1 |
|---|
| 51 | .Xr mDNSResponder 8 |
|---|
| 52 | .Pp |
|---|
| 53 | For information on Dynamic DNS Update, see RFC 2136 |
|---|
| 54 | "Dynamic Updates in the Domain Name System (DNS UPDATE)" |
|---|
| 55 | .Pp |
|---|
| 56 | For information on Dynamic DNS Update Leases, see |
|---|
| 57 | .Pa http://files.dns-sd.org/draft-dns-update-leases.txt |
|---|
| 58 | .Pp |
|---|
| 59 | For information on Long-Lived Queries, see |
|---|
| 60 | .Pa http://files.dns-sd.org/draft-dns-llq.txt |
|---|
| 61 | .\" |
|---|
| 62 | .Sh BUGS |
|---|
| 63 | .Nm |
|---|
| 64 | bugs are tracked in Apple Radar component "mDNSResponder". |
|---|
| 65 | .\" |
|---|
| 66 | .Sh HISTORY |
|---|
| 67 | The |
|---|
| 68 | .Nm |
|---|
| 69 | daemon first appeared in Mac OS X 10.4 (Tiger). |
|---|
![[RTEMS Logo]](/images/logo.png){kind=logo}
