1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
|
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<!--
- Copyright (C) 2000-2012, 2014-2019 Internet Systems Consortium, Inc. ("ISC")
-
- This Source Code Form is subject to the terms of the Mozilla Public
- License, v. 2.0. If a copy of the MPL was not distributed with this
- file, You can obtain one at http://mozilla.org/MPL/2.0/.
-->
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>nsupdate</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.78.1">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="refentry">
<a name="man.nsupdate"></a><div class="titlepage"></div>
<div class="refnamediv">
<h2>Name</h2>
<p>
<span class="application">nsupdate</span>
— Dynamic DNS update utility
</p>
</div>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<div class="cmdsynopsis"><p>
<code class="command">nsupdate</code>
[<code class="option">-d</code>]
[<code class="option">-D</code>]
[<code class="option">-i</code>]
[<code class="option">-L <em class="replaceable"><code>level</code></em></code>]
[
[<code class="option">-g</code>]
| [<code class="option">-o</code>]
| [<code class="option">-l</code>]
| [<code class="option">-y <em class="replaceable"><code>[<span class="optional">hmac:</span>]keyname:secret</code></em></code>]
| [<code class="option">-k <em class="replaceable"><code>keyfile</code></em></code>]
]
[<code class="option">-t <em class="replaceable"><code>timeout</code></em></code>]
[<code class="option">-u <em class="replaceable"><code>udptimeout</code></em></code>]
[<code class="option">-r <em class="replaceable"><code>udpretries</code></em></code>]
[<code class="option">-R <em class="replaceable"><code>randomdev</code></em></code>]
[<code class="option">-v</code>]
[<code class="option">-T</code>]
[<code class="option">-P</code>]
[<code class="option">-V</code>]
[filename]
</p></div>
</div>
<div class="refsection">
<a name="id-1.7"></a><h2>DESCRIPTION</h2>
<p><span class="command"><strong>nsupdate</strong></span>
is used to submit Dynamic DNS Update requests as defined in RFC 2136
to a name server.
This allows resource records to be added or removed from a zone
without manually editing the zone file.
A single update request can contain requests to add or remove more than
one
resource record.
</p>
<p>
Zones that are under dynamic control via
<span class="command"><strong>nsupdate</strong></span>
or a DHCP server should not be edited by hand.
Manual edits could
conflict with dynamic updates and cause data to be lost.
</p>
<p>
The resource records that are dynamically added or removed with
<span class="command"><strong>nsupdate</strong></span>
have to be in the same zone.
Requests are sent to the zone's master server.
This is identified by the MNAME field of the zone's SOA record.
</p>
<p>
Transaction signatures can be used to authenticate the Dynamic
DNS updates. These use the TSIG resource record type described
in RFC 2845 or the SIG(0) record described in RFC 2535 and
RFC 2931 or GSS-TSIG as described in RFC 3645.
</p>
<p>
TSIG relies on
a shared secret that should only be known to
<span class="command"><strong>nsupdate</strong></span> and the name server.
For instance, suitable <span class="type">key</span> and
<span class="type">server</span> statements would be added to
<code class="filename">/etc/named.conf</code> so that the name server
can associate the appropriate secret key and algorithm with
the IP address of the client application that will be using
TSIG authentication. You can use <span class="command"><strong>ddns-confgen</strong></span>
to generate suitable configuration fragments.
<span class="command"><strong>nsupdate</strong></span>
uses the <code class="option">-y</code> or <code class="option">-k</code> options
to provide the TSIG shared secret. These options are mutually exclusive.
</p>
<p>
SIG(0) uses public key cryptography.
To use a SIG(0) key, the public key must be stored in a KEY
record in a zone served by the name server.
</p>
<p>
GSS-TSIG uses Kerberos credentials. Standard GSS-TSIG mode
is switched on with the <code class="option">-g</code> flag. A
non-standards-compliant variant of GSS-TSIG used by Windows
2000 can be switched on with the <code class="option">-o</code> flag.
</p>
</div>
<div class="refsection">
<a name="id-1.8"></a><h2>OPTIONS</h2>
<div class="variablelist"><dl class="variablelist">
<dt><span class="term">-d</span></dt>
<dd>
<p>
Debug mode. This provides tracing information about the
update requests that are made and the replies received
from the name server.
</p>
</dd>
<dt><span class="term">-D</span></dt>
<dd>
<p>
Extra debug mode.
</p>
</dd>
<dt><span class="term">-i</span></dt>
<dd>
<p>
Force interactive mode, even when standard input is not a terminal.
</p>
</dd>
<dt><span class="term">-k <em class="replaceable"><code>keyfile</code></em></span></dt>
<dd>
<p>
The file containing the TSIG authentication key.
Keyfiles may be in two formats: a single file containing
a <code class="filename">named.conf</code>-format <span class="command"><strong>key</strong></span>
statement, which may be generated automatically by
<span class="command"><strong>ddns-confgen</strong></span>, or a pair of files whose names are
of the format <code class="filename">K{name}.+157.+{random}.key</code> and
<code class="filename">K{name}.+157.+{random}.private</code>, which can be
generated by <span class="command"><strong>dnssec-keygen</strong></span>.
The <code class="option">-k</code> may also be used to specify a SIG(0) key used
to authenticate Dynamic DNS update requests. In this case, the key
specified is not an HMAC-MD5 key.
</p>
</dd>
<dt><span class="term">-l</span></dt>
<dd>
<p>
Local-host only mode. This sets the server address to
localhost (disabling the <span class="command"><strong>server</strong></span> so that the server
address cannot be overridden). Connections to the local server will
use a TSIG key found in <code class="filename">/var/run/named/session.key</code>,
which is automatically generated by <span class="command"><strong>named</strong></span> if any
local master zone has set <span class="command"><strong>update-policy</strong></span> to
<span class="command"><strong>local</strong></span>. The location of this key file can be
overridden with the <code class="option">-k</code> option.
</p>
</dd>
<dt><span class="term">-L <em class="replaceable"><code>level</code></em></span></dt>
<dd>
<p>
Set the logging debug level. If zero, logging is disabled.
</p>
</dd>
<dt><span class="term">-p <em class="replaceable"><code>port</code></em></span></dt>
<dd>
<p>
Set the port to use for connections to a name server. The
default is 53.
</p>
</dd>
<dt><span class="term">-P</span></dt>
<dd>
<p>
Print the list of private BIND-specific resource record
types whose format is understood
by <span class="command"><strong>nsupdate</strong></span>. See also
the <code class="option">-T</code> option.
</p>
</dd>
<dt><span class="term">-r <em class="replaceable"><code>udpretries</code></em></span></dt>
<dd>
<p>
The number of UDP retries. The default is 3. If zero, only
one update request will be made.
</p>
</dd>
<dt><span class="term">-R <em class="replaceable"><code>randomdev</code></em></span></dt>
<dd>
<p>
Where to obtain randomness. If the operating system
does not provide a <code class="filename">/dev/random</code> or
equivalent device, the default source of randomness is keyboard
input. <code class="filename">randomdev</code> specifies the name of
a character device or file containing random data to be used
instead of the default. The special value
<code class="filename">keyboard</code> indicates that keyboard input
should be used. This option may be specified multiple times.
</p>
</dd>
<dt><span class="term">-t <em class="replaceable"><code>timeout</code></em></span></dt>
<dd>
<p>
The maximum time an update request can take before it is
aborted. The default is 300 seconds. Zero can be used to
disable the timeout.
</p>
</dd>
<dt><span class="term">-T</span></dt>
<dd>
<p>
Print the list of IANA standard resource record types
whose format is understood by <span class="command"><strong>nsupdate</strong></span>.
<span class="command"><strong>nsupdate</strong></span> will exit after the lists are
printed. The <code class="option">-T</code> option can be combined
with the <code class="option">-P</code> option.
</p>
<p>
Other types can be entered using "TYPEXXXXX" where "XXXXX" is the
decimal value of the type with no leading zeros. The rdata,
if present, will be parsed using the UNKNOWN rdata format,
(<backslash> <hash> <space> <length>
<space> <hexstring>).
</p>
</dd>
<dt><span class="term">-u <em class="replaceable"><code>udptimeout</code></em></span></dt>
<dd>
<p>
The UDP retry interval. The default is 3 seconds. If zero,
the interval will be computed from the timeout interval and
number of UDP retries.
</p>
</dd>
<dt><span class="term">-v</span></dt>
<dd>
<p>
Use TCP even for small update requests.
By default, <span class="command"><strong>nsupdate</strong></span>
uses UDP to send update requests to the name server unless they are too
large to fit in a UDP request in which case TCP will be used.
TCP may be preferable when a batch of update requests is made.
</p>
</dd>
<dt><span class="term">-V</span></dt>
<dd>
<p>
Print the version number and exit.
</p>
</dd>
<dt><span class="term">-y <em class="replaceable"><code>[<span class="optional">hmac:</span>]keyname:secret</code></em></span></dt>
<dd>
<p>
Literal TSIG authentication key.
<em class="parameter"><code>keyname</code></em> is the name of the key, and
<em class="parameter"><code>secret</code></em> is the base64 encoded shared secret.
<em class="parameter"><code>hmac</code></em> is the name of the key algorithm;
valid choices are <code class="literal">hmac-md5</code>,
<code class="literal">hmac-sha1</code>, <code class="literal">hmac-sha224</code>,
<code class="literal">hmac-sha256</code>, <code class="literal">hmac-sha384</code>, or
<code class="literal">hmac-sha512</code>. If <em class="parameter"><code>hmac</code></em>
is not specified, the default is <code class="literal">hmac-md5</code>
or if MD5 was disabled <code class="literal">hmac-sha256</code>.
</p>
<p>
NOTE: Use of the <code class="option">-y</code> option is discouraged because the
shared secret is supplied as a command line argument in clear text.
This may be visible in the output from
<span class="citerefentry">
<span class="refentrytitle">ps</span>(1)
</span>
or in a history file maintained by the user's shell.
</p>
</dd>
</dl></div>
</div>
<div class="refsection">
<a name="id-1.9"></a><h2>INPUT FORMAT</h2>
<p><span class="command"><strong>nsupdate</strong></span>
reads input from
<em class="parameter"><code>filename</code></em>
or standard input.
Each command is supplied on exactly one line of input.
Some commands are for administrative purposes.
The others are either update instructions or prerequisite checks on the
contents of the zone.
These checks set conditions that some name or set of
resource records (RRset) either exists or is absent from the zone.
These conditions must be met if the entire update request is to succeed.
Updates will be rejected if the tests for the prerequisite conditions
fail.
</p>
<p>
Every update request consists of zero or more prerequisites
and zero or more updates.
This allows a suitably authenticated update request to proceed if some
specified resource records are present or missing from the zone.
A blank input line (or the <span class="command"><strong>send</strong></span> command)
causes the
accumulated commands to be sent as one Dynamic DNS update request to the
name server.
</p>
<p>
The command formats and their meaning are as follows:
</p>
<div class="variablelist"><dl class="variablelist">
<dt><span class="term">
<span class="command"><strong>server</strong></span>
{servername}
[port]
</span></dt>
<dd>
<p>
Sends all dynamic update requests to the name server
<em class="parameter"><code>servername</code></em>.
When no server statement is provided,
<span class="command"><strong>nsupdate</strong></span>
will send updates to the master server of the correct zone.
The MNAME field of that zone's SOA record will identify the
master
server for that zone.
<em class="parameter"><code>port</code></em>
is the port number on
<em class="parameter"><code>servername</code></em>
where the dynamic update requests get sent.
If no port number is specified, the default DNS port number of
53 is
used.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>local</strong></span>
{address}
[port]
</span></dt>
<dd>
<p>
Sends all dynamic update requests using the local
<em class="parameter"><code>address</code></em>.
When no local statement is provided,
<span class="command"><strong>nsupdate</strong></span>
will send updates using an address and port chosen by the
system.
<em class="parameter"><code>port</code></em>
can additionally be used to make requests come from a specific
port.
If no port number is specified, the system will assign one.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>zone</strong></span>
{zonename}
</span></dt>
<dd>
<p>
Specifies that all updates are to be made to the zone
<em class="parameter"><code>zonename</code></em>.
If no
<em class="parameter"><code>zone</code></em>
statement is provided,
<span class="command"><strong>nsupdate</strong></span>
will attempt determine the correct zone to update based on the
rest of the input.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>class</strong></span>
{classname}
</span></dt>
<dd>
<p>
Specify the default class.
If no <em class="parameter"><code>class</code></em> is specified, the
default class is
<em class="parameter"><code>IN</code></em>.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>ttl</strong></span>
{seconds}
</span></dt>
<dd>
<p>
Specify the default time to live for records to be added.
The value <em class="parameter"><code>none</code></em> will clear the default
ttl.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>key</strong></span>
[hmac:] {keyname}
{secret}
</span></dt>
<dd>
<p>
Specifies that all updates are to be TSIG-signed using the
<em class="parameter"><code>keyname</code></em> <em class="parameter"><code>secret</code></em> pair.
If <em class="parameter"><code>hmac</code></em> is specified, then it sets the
signing algorithm in use; the default is
<code class="literal">hmac-md5</code> or if MD5 was disabled
<code class="literal">hmac-sha256</code>. The <span class="command"><strong>key</strong></span>
command overrides any key specified on the command line via
<code class="option">-y</code> or <code class="option">-k</code>.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>gsstsig</strong></span>
</span></dt>
<dd>
<p>
Use GSS-TSIG to sign the updated. This is equivalent to
specifying <code class="option">-g</code> on the command line.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>oldgsstsig</strong></span>
</span></dt>
<dd>
<p>
Use the Windows 2000 version of GSS-TSIG to sign the updated.
This is equivalent to specifying <code class="option">-o</code> on the
command line.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>realm</strong></span>
{[<span class="optional">realm_name</span>]}
</span></dt>
<dd>
<p>
When using GSS-TSIG use <em class="parameter"><code>realm_name</code></em> rather
than the default realm in <code class="filename">krb5.conf</code>. If no
realm is specified the saved realm is cleared.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>check-names</strong></span>
{[<span class="optional">yes_or_no</span>]}
</span></dt>
<dd>
<p>
Turn on or off check-names processing on records to
be added. Check-names has no effect on prerequisites
or records to be deleted. By default check-names
processing is on. If check-names processing fails
the record will not be added to the UPDATE message.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>[<span class="optional">prereq</span>] nxdomain</strong></span>
{domain-name}
</span></dt>
<dd>
<p>
Requires that no resource record of any type exists with name
<em class="parameter"><code>domain-name</code></em>.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>[<span class="optional">prereq</span>] yxdomain</strong></span>
{domain-name}
</span></dt>
<dd>
<p>
Requires that
<em class="parameter"><code>domain-name</code></em>
exists (has as at least one resource record, of any type).
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>[<span class="optional">prereq</span>] nxrrset</strong></span>
{domain-name}
[class]
{type}
</span></dt>
<dd>
<p>
Requires that no resource record exists of the specified
<em class="parameter"><code>type</code></em>,
<em class="parameter"><code>class</code></em>
and
<em class="parameter"><code>domain-name</code></em>.
If
<em class="parameter"><code>class</code></em>
is omitted, IN (internet) is assumed.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>[<span class="optional">prereq</span>] yxrrset</strong></span>
{domain-name}
[class]
{type}
</span></dt>
<dd>
<p>
This requires that a resource record of the specified
<em class="parameter"><code>type</code></em>,
<em class="parameter"><code>class</code></em>
and
<em class="parameter"><code>domain-name</code></em>
must exist.
If
<em class="parameter"><code>class</code></em>
is omitted, IN (internet) is assumed.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>[<span class="optional">prereq</span>] yxrrset</strong></span>
{domain-name}
[class]
{type}
{data...}
</span></dt>
<dd>
<p>
The
<em class="parameter"><code>data</code></em>
from each set of prerequisites of this form
sharing a common
<em class="parameter"><code>type</code></em>,
<em class="parameter"><code>class</code></em>,
and
<em class="parameter"><code>domain-name</code></em>
are combined to form a set of RRs. This set of RRs must
exactly match the set of RRs existing in the zone at the
given
<em class="parameter"><code>type</code></em>,
<em class="parameter"><code>class</code></em>,
and
<em class="parameter"><code>domain-name</code></em>.
The
<em class="parameter"><code>data</code></em>
are written in the standard text representation of the resource
record's
RDATA.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>[<span class="optional">update</span>] del[<span class="optional">ete</span>]</strong></span>
{domain-name}
[ttl]
[class]
[type [data...]]
</span></dt>
<dd>
<p>
Deletes any resource records named
<em class="parameter"><code>domain-name</code></em>.
If
<em class="parameter"><code>type</code></em>
and
<em class="parameter"><code>data</code></em>
is provided, only matching resource records will be removed.
The internet class is assumed if
<em class="parameter"><code>class</code></em>
is not supplied. The
<em class="parameter"><code>ttl</code></em>
is ignored, and is only allowed for compatibility.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>[<span class="optional">update</span>] add</strong></span>
{domain-name}
{ttl}
[class]
{type}
{data...}
</span></dt>
<dd>
<p>
Adds a new resource record with the specified
<em class="parameter"><code>ttl</code></em>,
<em class="parameter"><code>class</code></em>
and
<em class="parameter"><code>data</code></em>.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>show</strong></span>
</span></dt>
<dd>
<p>
Displays the current message, containing all of the
prerequisites and
updates specified since the last send.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>send</strong></span>
</span></dt>
<dd>
<p>
Sends the current message. This is equivalent to entering a
blank line.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>answer</strong></span>
</span></dt>
<dd>
<p>
Displays the answer.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>debug</strong></span>
</span></dt>
<dd>
<p>
Turn on debugging.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>version</strong></span>
</span></dt>
<dd>
<p>
Print version number.
</p>
</dd>
<dt><span class="term">
<span class="command"><strong>help</strong></span>
</span></dt>
<dd>
<p>
Print a list of commands.
</p>
</dd>
</dl></div>
<p>
</p>
<p>
Lines beginning with a semicolon are comments and are ignored.
</p>
</div>
<div class="refsection">
<a name="id-1.10"></a><h2>EXAMPLES</h2>
<p>
The examples below show how
<span class="command"><strong>nsupdate</strong></span>
could be used to insert and delete resource records from the
<span class="type">example.com</span>
zone.
Notice that the input in each example contains a trailing blank line so
that
a group of commands are sent as one dynamic update request to the
master name server for
<span class="type">example.com</span>.
</p>
<pre class="programlisting">
# nsupdate
> update delete oldhost.example.com A
> update add newhost.example.com 86400 A 172.16.1.1
> send
</pre>
<p>
</p>
<p>
Any A records for
<span class="type">oldhost.example.com</span>
are deleted.
And an A record for
<span class="type">newhost.example.com</span>
with IP address 172.16.1.1 is added.
The newly-added record has a 1 day TTL (86400 seconds).
</p>
<pre class="programlisting">
# nsupdate
> prereq nxdomain nickname.example.com
> update add nickname.example.com 86400 CNAME somehost.example.com
> send
</pre>
<p>
</p>
<p>
The prerequisite condition gets the name server to check that there
are no resource records of any type for
<span class="type">nickname.example.com</span>.
If there are, the update request fails.
If this name does not exist, a CNAME for it is added.
This ensures that when the CNAME is added, it cannot conflict with the
long-standing rule in RFC 1034 that a name must not exist as any other
record type if it exists as a CNAME.
(The rule has been updated for DNSSEC in RFC 2535 to allow CNAMEs to have
RRSIG, DNSKEY and NSEC records.)
</p>
</div>
<div class="refsection">
<a name="id-1.11"></a><h2>FILES</h2>
<div class="variablelist"><dl class="variablelist">
<dt><span class="term"><code class="constant">/etc/resolv.conf</code></span></dt>
<dd>
<p>
used to identify default name server
</p>
</dd>
<dt><span class="term"><code class="constant">/var/run/named/session.key</code></span></dt>
<dd>
<p>
sets the default TSIG key for use in local-only mode
</p>
</dd>
<dt><span class="term"><code class="constant">K{name}.+157.+{random}.key</code></span></dt>
<dd>
<p>
base-64 encoding of HMAC-MD5 key created by
<span class="citerefentry">
<span class="refentrytitle">dnssec-keygen</span>(8)
</span>.
</p>
</dd>
<dt><span class="term"><code class="constant">K{name}.+157.+{random}.private</code></span></dt>
<dd>
<p>
base-64 encoding of HMAC-MD5 key created by
<span class="citerefentry">
<span class="refentrytitle">dnssec-keygen</span>(8)
</span>.
</p>
</dd>
</dl></div>
</div>
<div class="refsection">
<a name="id-1.12"></a><h2>SEE ALSO</h2>
<p>
<em class="citetitle">RFC 2136</em>,
<em class="citetitle">RFC 3007</em>,
<em class="citetitle">RFC 2104</em>,
<em class="citetitle">RFC 2845</em>,
<em class="citetitle">RFC 1034</em>,
<em class="citetitle">RFC 2535</em>,
<em class="citetitle">RFC 2931</em>,
<span class="citerefentry">
<span class="refentrytitle">named</span>(8)
</span>,
<span class="citerefentry">
<span class="refentrytitle">ddns-confgen</span>(8)
</span>,
<span class="citerefentry">
<span class="refentrytitle">dnssec-keygen</span>(8)
</span>.
</p>
</div>
<div class="refsection">
<a name="id-1.13"></a><h2>BUGS</h2>
<p>
The TSIG key is redundantly stored in two separate files.
This is a consequence of nsupdate using the DST library
for its cryptographic operations, and may change in future
releases.
</p>
</div>
</div></body>
</html>
|
