xref: /freebsd/contrib/unbound/doc/example.conf.in (revision 7cc42f6d)
1#
2# Example configuration file.
3#
4# See unbound.conf(5) man page, version 1.11.0.
5#
6# this is a comment.
7
8# Use this anywhere in the file to include other text into this file.
9#include: "otherfile.conf"
10
11# Use this anywhere in the file to include other text, that explicitly starts a
12# clause, into this file. Text after this directive needs to start a clause.
13#include-toplevel: "otherfile.conf"
14
15# The server clause sets the main parameters.
16server:
17	# whitespace is not necessary, but looks cleaner.
18
19	# verbosity number, 0 is least verbose. 1 is default.
20	verbosity: 1
21
22	# print statistics to the log (for every thread) every N seconds.
23	# Set to "" or 0 to disable. Default is disabled.
24	# statistics-interval: 0
25
26	# enable shm for stats, default no.  if you enable also enable
27	# statistics-interval, every time it also writes stats to the
28	# shared memory segment keyed with shm-key.
29	# shm-enable: no
30
31	# shm for stats uses this key, and key+1 for the shared mem segment.
32	# shm-key: 11777
33
34	# enable cumulative statistics, without clearing them after printing.
35	# statistics-cumulative: no
36
37	# enable extended statistics (query types, answer codes, status)
38	# printed from unbound-control. default off, because of speed.
39	# extended-statistics: no
40
41	# number of threads to create. 1 disables threading.
42	# num-threads: 1
43
44	# specify the interfaces to answer queries from by ip-address.
45	# The default is to listen to localhost (127.0.0.1 and ::1).
46	# specify 0.0.0.0 and ::0 to bind to all available interfaces.
47	# specify every interface[@port] on a new 'interface:' labelled line.
48	# The listen interfaces are not changed on reload, only on restart.
49	# interface: 192.0.2.153
50	# interface: 192.0.2.154
51	# interface: 192.0.2.154@5003
52	# interface: 2001:DB8::5
53
54	# enable this feature to copy the source address of queries to reply.
55	# Socket options are not supported on all platforms. experimental.
56	# interface-automatic: no
57
58	# port to answer queries from
59	# port: 53
60
61	# specify the interfaces to send outgoing queries to authoritative
62	# server from by ip-address. If none, the default (all) interface
63	# is used. Specify every interface on a 'outgoing-interface:' line.
64	# outgoing-interface: 192.0.2.153
65	# outgoing-interface: 2001:DB8::5
66	# outgoing-interface: 2001:DB8::6
67
68	# Specify a netblock to use remainder 64 bits as random bits for
69	# upstream queries.  Uses freebind option (Linux).
70	# outgoing-interface: 2001:DB8::/64
71	# Also (Linux:) ip -6 addr add 2001:db8::/64 dev lo
72	# And: ip -6 route add local 2001:db8::/64 dev lo
73	# And set prefer-ip6: yes to use the ip6 randomness from a netblock.
74	# Set this to yes to prefer ipv6 upstream servers over ipv4.
75	# prefer-ip6: no
76
77	# Prefer ipv4 upstream servers, even if ipv6 is available.
78	# prefer-ip4: no
79
80	# number of ports to allocate per thread, determines the size of the
81	# port range that can be open simultaneously.  About double the
82	# num-queries-per-thread, or, use as many as the OS will allow you.
83	# outgoing-range: 4096
84
85	# permit unbound to use this port number or port range for
86	# making outgoing queries, using an outgoing interface.
87	# outgoing-port-permit: 32768
88
89	# deny unbound the use this of port number or port range for
90	# making outgoing queries, using an outgoing interface.
91	# Use this to make sure unbound does not grab a UDP port that some
92	# other server on this computer needs. The default is to avoid
93	# IANA-assigned port numbers.
94	# If multiple outgoing-port-permit and outgoing-port-avoid options
95	# are present, they are processed in order.
96	# outgoing-port-avoid: "3200-3208"
97
98	# number of outgoing simultaneous tcp buffers to hold per thread.
99	# outgoing-num-tcp: 10
100
101	# number of incoming simultaneous tcp buffers to hold per thread.
102	# incoming-num-tcp: 10
103
104	# buffer size for UDP port 53 incoming (SO_RCVBUF socket option).
105	# 0 is system default.  Use 4m to catch query spikes for busy servers.
106	# so-rcvbuf: 0
107
108	# buffer size for UDP port 53 outgoing (SO_SNDBUF socket option).
109	# 0 is system default.  Use 4m to handle spikes on very busy servers.
110	# so-sndbuf: 0
111
112	# use SO_REUSEPORT to distribute queries over threads.
113	# at extreme load it could be better to turn it off to distribute even.
114	# so-reuseport: yes
115
116	# use IP_TRANSPARENT so the interface: addresses can be non-local
117	# and you can config non-existing IPs that are going to work later on
118	# (uses IP_BINDANY on FreeBSD).
119	# ip-transparent: no
120
121	# use IP_FREEBIND so the interface: addresses can be non-local
122	# and you can bind to nonexisting IPs and interfaces that are down.
123	# Linux only.  On Linux you also have ip-transparent that is similar.
124	# ip-freebind: no
125
126	# the value of the Differentiated Services Codepoint (DSCP)
127	# in the differentiated services field (DS) of the outgoing
128	# IP packets
129	# ip-dscp: 0
130
131	# EDNS reassembly buffer to advertise to UDP peers (the actual buffer
132	# is set with msg-buffer-size). 1472 can solve fragmentation (timeouts)
133	# edns-buffer-size: 4096
134
135	# Maximum UDP response size (not applied to TCP response).
136	# Suggested values are 512 to 4096. Default is 4096. 65536 disables it.
137	# max-udp-size: 4096
138
139	# max memory to use for stream(tcp and tls) waiting result buffers.
140	# stream-wait-size: 4m
141
142	# buffer size for handling DNS data. No messages larger than this
143	# size can be sent or received, by UDP or TCP. In bytes.
144	# msg-buffer-size: 65552
145
146	# the amount of memory to use for the message cache.
147	# plain value in bytes or you can append k, m or G. default is "4Mb".
148	# msg-cache-size: 4m
149
150	# the number of slabs to use for the message cache.
151	# the number of slabs must be a power of 2.
152	# more slabs reduce lock contention, but fragment memory usage.
153	# msg-cache-slabs: 4
154
155	# the number of queries that a thread gets to service.
156	# num-queries-per-thread: 1024
157
158	# if very busy, 50% queries run to completion, 50% get timeout in msec
159	# jostle-timeout: 200
160
161	# msec to wait before close of port on timeout UDP. 0 disables.
162	# delay-close: 0
163
164	# msec for waiting for an unknown server to reply.  Increase if you
165	# are behind a slow satellite link, to eg. 1128.
166	# unknown-server-time-limit: 376
167
168	# the amount of memory to use for the RRset cache.
169	# plain value in bytes or you can append k, m or G. default is "4Mb".
170	# rrset-cache-size: 4m
171
172	# the number of slabs to use for the RRset cache.
173	# the number of slabs must be a power of 2.
174	# more slabs reduce lock contention, but fragment memory usage.
175	# rrset-cache-slabs: 4
176
177	# the time to live (TTL) value lower bound, in seconds. Default 0.
178	# If more than an hour could easily give trouble due to stale data.
179	# cache-min-ttl: 0
180
181	# the time to live (TTL) value cap for RRsets and messages in the
182	# cache. Items are not cached for longer. In seconds.
183	# cache-max-ttl: 86400
184
185	# the time to live (TTL) value cap for negative responses in the cache
186	# cache-max-negative-ttl: 3600
187
188	# the time to live (TTL) value for cached roundtrip times, lameness and
189	# EDNS version information for hosts. In seconds.
190	# infra-host-ttl: 900
191
192	# minimum wait time for responses, increase if uplink is long. In msec.
193	# infra-cache-min-rtt: 50
194
195	# the number of slabs to use for the Infrastructure cache.
196	# the number of slabs must be a power of 2.
197	# more slabs reduce lock contention, but fragment memory usage.
198	# infra-cache-slabs: 4
199
200	# the maximum number of hosts that are cached (roundtrip, EDNS, lame).
201	# infra-cache-numhosts: 10000
202
203	# define a number of tags here, use with local-zone, access-control.
204	# repeat the define-tag statement to add additional tags.
205	# define-tag: "tag1 tag2 tag3"
206
207	# Enable IPv4, "yes" or "no".
208	# do-ip4: yes
209
210	# Enable IPv6, "yes" or "no".
211	# do-ip6: yes
212
213	# Enable UDP, "yes" or "no".
214	# do-udp: yes
215
216	# Enable TCP, "yes" or "no".
217	# do-tcp: yes
218
219	# upstream connections use TCP only (and no UDP), "yes" or "no"
220	# useful for tunneling scenarios, default no.
221	# tcp-upstream: no
222
223	# upstream connections also use UDP (even if do-udp is no).
224	# useful if if you want UDP upstream, but don't provide UDP downstream.
225	# udp-upstream-without-downstream: no
226
227	# Maximum segment size (MSS) of TCP socket on which the server
228	# responds to queries. Default is 0, system default MSS.
229	# tcp-mss: 0
230
231	# Maximum segment size (MSS) of TCP socket for outgoing queries.
232	# Default is 0, system default MSS.
233	# outgoing-tcp-mss: 0
234
235	# Idle TCP timeout, connection closed in milliseconds
236	# tcp-idle-timeout: 30000
237
238	# Enable EDNS TCP keepalive option.
239	# edns-tcp-keepalive: no
240
241	# Timeout for EDNS TCP keepalive, in msec.
242	# edns-tcp-keepalive-timeout: 120000
243
244	# Use systemd socket activation for UDP, TCP, and control sockets.
245	# use-systemd: no
246
247	# Detach from the terminal, run in background, "yes" or "no".
248	# Set the value to "no" when unbound runs as systemd service.
249	# do-daemonize: yes
250
251	# control which clients are allowed to make (recursive) queries
252	# to this server. Specify classless netblocks with /size and action.
253	# By default everything is refused, except for localhost.
254	# Choose deny (drop message), refuse (polite error reply),
255	# allow (recursive ok), allow_setrd (recursive ok, rd bit is forced on),
256	# allow_snoop (recursive and nonrecursive ok)
257	# deny_non_local (drop queries unless can be answered from local-data)
258	# refuse_non_local (like deny_non_local but polite error reply).
259	# access-control: 0.0.0.0/0 refuse
260	# access-control: 127.0.0.0/8 allow
261	# access-control: ::0/0 refuse
262	# access-control: ::1 allow
263	# access-control: ::ffff:127.0.0.1 allow
264
265	# tag access-control with list of tags (in "" with spaces between)
266	# Clients using this access control element use localzones that
267	# are tagged with one of these tags.
268	# access-control-tag: 192.0.2.0/24 "tag2 tag3"
269
270	# set action for particular tag for given access control element
271	# if you have multiple tag values, the tag used to lookup the action
272	# is the first tag match between access-control-tag and local-zone-tag
273	# where "first" comes from the order of the define-tag values.
274	# access-control-tag-action: 192.0.2.0/24 tag3 refuse
275
276	# set redirect data for particular tag for access control element
277	# access-control-tag-data: 192.0.2.0/24 tag2 "A 127.0.0.1"
278
279	# Set view for access control element
280	# access-control-view: 192.0.2.0/24 viewname
281
282	# if given, a chroot(2) is done to the given directory.
283	# i.e. you can chroot to the working directory, for example,
284	# for extra security, but make sure all files are in that directory.
285	#
286	# If chroot is enabled, you should pass the configfile (from the
287	# commandline) as a full path from the original root. After the
288	# chroot has been performed the now defunct portion of the config
289	# file path is removed to be able to reread the config after a reload.
290	#
291	# All other file paths (working dir, logfile, roothints, and
292	# key files) can be specified in several ways:
293	# 	o as an absolute path relative to the new root.
294	# 	o as a relative path to the working directory.
295	# 	o as an absolute path relative to the original root.
296	# In the last case the path is adjusted to remove the unused portion.
297	#
298	# The pid file can be absolute and outside of the chroot, it is
299	# written just prior to performing the chroot and dropping permissions.
300	#
301	# Additionally, unbound may need to access /dev/urandom (for entropy).
302	# How to do this is specific to your OS.
303	#
304	# If you give "" no chroot is performed. The path must not end in a /.
305	# chroot: "@UNBOUND_CHROOT_DIR@"
306
307	# if given, user privileges are dropped (after binding port),
308	# and the given username is assumed. Default is user "unbound".
309	# If you give "" no privileges are dropped.
310	# username: "@UNBOUND_USERNAME@"
311
312	# the working directory. The relative files in this config are
313	# relative to this directory. If you give "" the working directory
314	# is not changed.
315	# If you give a server: directory: dir before include: file statements
316	# then those includes can be relative to the working directory.
317	# directory: "@UNBOUND_RUN_DIR@"
318
319	# the log file, "" means log to stderr.
320	# Use of this option sets use-syslog to "no".
321	# logfile: ""
322
323	# Log to syslog(3) if yes. The log facility LOG_DAEMON is used to
324	# log to. If yes, it overrides the logfile.
325	# use-syslog: yes
326
327	# Log identity to report. if empty, defaults to the name of argv[0]
328	# (usually "unbound").
329	# log-identity: ""
330
331	# print UTC timestamp in ascii to logfile, default is epoch in seconds.
332	# log-time-ascii: no
333
334	# print one line with time, IP, name, type, class for every query.
335	# log-queries: no
336
337	# print one line per reply, with time, IP, name, type, class, rcode,
338	# timetoresolve, fromcache and responsesize.
339	# log-replies: no
340
341	# log with tag 'query' and 'reply' instead of 'info' for
342	# filtering log-queries and log-replies from the log.
343	# log-tag-queryreply: no
344
345	# log the local-zone actions, like local-zone type inform is enabled
346	# also for the other local zone types.
347	# log-local-actions: no
348
349	# print log lines that say why queries return SERVFAIL to clients.
350	# log-servfail: no
351
352	# the pid file. Can be an absolute path outside of chroot/work dir.
353	# pidfile: "@UNBOUND_PIDFILE@"
354
355	# file to read root hints from.
356	# get one from https://www.internic.net/domain/named.cache
357	# root-hints: ""
358
359	# enable to not answer id.server and hostname.bind queries.
360	# hide-identity: no
361
362	# enable to not answer version.server and version.bind queries.
363	# hide-version: no
364
365	# enable to not answer trustanchor.unbound queries.
366	# hide-trustanchor: no
367
368	# the identity to report. Leave "" or default to return hostname.
369	# identity: ""
370
371	# the version to report. Leave "" or default to return package version.
372	# version: ""
373
374	# the target fetch policy.
375	# series of integers describing the policy per dependency depth.
376	# The number of values in the list determines the maximum dependency
377	# depth the recursor will pursue before giving up. Each integer means:
378	# 	-1 : fetch all targets opportunistically,
379	# 	0: fetch on demand,
380	#	positive value: fetch that many targets opportunistically.
381	# Enclose the list of numbers between quotes ("").
382	# target-fetch-policy: "3 2 1 0 0"
383
384	# Harden against very small EDNS buffer sizes.
385	# harden-short-bufsize: no
386
387	# Harden against unseemly large queries.
388	# harden-large-queries: no
389
390	# Harden against out of zone rrsets, to avoid spoofing attempts.
391	# harden-glue: yes
392
393	# Harden against receiving dnssec-stripped data. If you turn it
394	# off, failing to validate dnskey data for a trustanchor will
395	# trigger insecure mode for that zone (like without a trustanchor).
396	# Default on, which insists on dnssec data for trust-anchored zones.
397	# harden-dnssec-stripped: yes
398
399	# Harden against queries that fall under dnssec-signed nxdomain names.
400	# harden-below-nxdomain: yes
401
402	# Harden the referral path by performing additional queries for
403	# infrastructure data.  Validates the replies (if possible).
404	# Default off, because the lookups burden the server.  Experimental
405	# implementation of draft-wijngaards-dnsext-resolver-side-mitigation.
406	# harden-referral-path: no
407
408	# Harden against algorithm downgrade when multiple algorithms are
409	# advertised in the DS record.  If no, allows the weakest algorithm
410	# to validate the zone.
411	# harden-algo-downgrade: no
412
413	# Sent minimum amount of information to upstream servers to enhance
414	# privacy. Only sent minimum required labels of the QNAME and set QTYPE
415	# to A when possible.
416	# qname-minimisation: yes
417
418	# QNAME minimisation in strict mode. Do not fall-back to sending full
419	# QNAME to potentially broken nameservers. A lot of domains will not be
420	# resolvable when this option in enabled.
421	# This option only has effect when qname-minimisation is enabled.
422	# qname-minimisation-strict: no
423
424	# Aggressive NSEC uses the DNSSEC NSEC chain to synthesize NXDOMAIN
425	# and other denials, using information from previous NXDOMAINs answers.
426	# aggressive-nsec: no
427
428	# Use 0x20-encoded random bits in the query to foil spoof attempts.
429	# This feature is an experimental implementation of draft dns-0x20.
430	# use-caps-for-id: no
431
432	# Domains (and domains in them) without support for dns-0x20 and
433	# the fallback fails because they keep sending different answers.
434	# caps-whitelist: "licdn.com"
435	# caps-whitelist: "senderbase.org"
436
437	# Enforce privacy of these addresses. Strips them away from answers.
438	# It may cause DNSSEC validation to additionally mark it as bogus.
439	# Protects against 'DNS Rebinding' (uses browser as network proxy).
440	# Only 'private-domain' and 'local-data' names are allowed to have
441	# these private addresses. No default.
442	# private-address: 10.0.0.0/8
443	# private-address: 172.16.0.0/12
444	# private-address: 192.168.0.0/16
445	# private-address: 169.254.0.0/16
446	# private-address: fd00::/8
447	# private-address: fe80::/10
448	# private-address: ::ffff:0:0/96
449
450	# Allow the domain (and its subdomains) to contain private addresses.
451	# local-data statements are allowed to contain private addresses too.
452	# private-domain: "example.com"
453
454	# If nonzero, unwanted replies are not only reported in statistics,
455	# but also a running total is kept per thread. If it reaches the
456	# threshold, a warning is printed and a defensive action is taken,
457	# the cache is cleared to flush potential poison out of it.
458	# A suggested value is 10000000, the default is 0 (turned off).
459	# unwanted-reply-threshold: 0
460
461	# Do not query the following addresses. No DNS queries are sent there.
462	# List one address per entry. List classless netblocks with /size,
463	# do-not-query-address: 127.0.0.1/8
464	# do-not-query-address: ::1
465
466	# if yes, the above default do-not-query-address entries are present.
467	# if no, localhost can be queried (for testing and debugging).
468	# do-not-query-localhost: yes
469
470	# if yes, perform prefetching of almost expired message cache entries.
471	# prefetch: no
472
473	# if yes, perform key lookups adjacent to normal lookups.
474	# prefetch-key: no
475
476	# deny queries of type ANY with an empty response.
477	# deny-any: no
478
479	# if yes, Unbound rotates RRSet order in response.
480	# rrset-roundrobin: yes
481
482	# if yes, Unbound doesn't insert authority/additional sections
483	# into response messages when those sections are not required.
484	# minimal-responses: yes
485
486	# true to disable DNSSEC lameness check in iterator.
487	# disable-dnssec-lame-check: no
488
489	# module configuration of the server. A string with identifiers
490	# separated by spaces. Syntax: "[dns64] [validator] iterator"
491	# most modules have to be listed at the beginning of the line,
492	# except cachedb(just before iterator), and python (at the beginning,
493	# or, just before the iterator).
494	# module-config: "validator iterator"
495
496	# File with trusted keys, kept uptodate using RFC5011 probes,
497	# initial file like trust-anchor-file, then it stores metadata.
498	# Use several entries, one per domain name, to track multiple zones.
499	#
500	# If you want to perform DNSSEC validation, run unbound-anchor before
501	# you start unbound (i.e. in the system boot scripts).  And enable:
502	# Please note usage of unbound-anchor root anchor is at your own risk
503	# and under the terms of our LICENSE (see that file in the source).
504	# auto-trust-anchor-file: "@UNBOUND_ROOTKEY_FILE@"
505
506	# trust anchor signaling sends a RFC8145 key tag query after priming.
507	# trust-anchor-signaling: yes
508
509	# Root key trust anchor sentinel (draft-ietf-dnsop-kskroll-sentinel)
510	# root-key-sentinel: yes
511
512	# File with DLV trusted keys. Same format as trust-anchor-file.
513	# There can be only one DLV configured, it is trusted from root down.
514	# DLV is going to be decommissioned.  Please do not use it any more.
515	# dlv-anchor-file: "dlv.isc.org.key"
516
517	# File with trusted keys for validation. Specify more than one file
518	# with several entries, one file per entry.
519	# Zone file format, with DS and DNSKEY entries.
520	# Note this gets out of date, use auto-trust-anchor-file please.
521	# trust-anchor-file: ""
522
523	# Trusted key for validation. DS or DNSKEY. specify the RR on a
524	# single line, surrounded by "". TTL is ignored. class is IN default.
525	# Note this gets out of date, use auto-trust-anchor-file please.
526	# (These examples are from August 2007 and may not be valid anymore).
527	# trust-anchor: "nlnetlabs.nl. DNSKEY 257 3 5 AQPzzTWMz8qSWIQlfRnPckx2BiVmkVN6LPupO3mbz7FhLSnm26n6iG9N Lby97Ji453aWZY3M5/xJBSOS2vWtco2t8C0+xeO1bc/d6ZTy32DHchpW 6rDH1vp86Ll+ha0tmwyy9QP7y2bVw5zSbFCrefk8qCUBgfHm9bHzMG1U BYtEIQ=="
528	# trust-anchor: "jelte.nlnetlabs.nl. DS 42860 5 1 14D739EB566D2B1A5E216A0BA4D17FA9B038BE4A"
529
530	# File with trusted keys for validation. Specify more than one file
531	# with several entries, one file per entry. Like trust-anchor-file
532	# but has a different file format. Format is BIND-9 style format,
533	# the trusted-keys { name flag proto algo "key"; }; clauses are read.
534	# you need external update procedures to track changes in keys.
535	# trusted-keys-file: ""
536
537	# Ignore chain of trust. Domain is treated as insecure.
538	# domain-insecure: "example.com"
539
540	# Override the date for validation with a specific fixed date.
541	# Do not set this unless you are debugging signature inception
542	# and expiration. "" or "0" turns the feature off. -1 ignores date.
543	# val-override-date: ""
544
545	# The time to live for bogus data, rrsets and messages. This avoids
546	# some of the revalidation, until the time interval expires. in secs.
547	# val-bogus-ttl: 60
548
549	# The signature inception and expiration dates are allowed to be off
550	# by 10% of the signature lifetime (expir-incep) from our local clock.
551	# This leeway is capped with a minimum and a maximum.  In seconds.
552	# val-sig-skew-min: 3600
553	# val-sig-skew-max: 86400
554
555	# Should additional section of secure message also be kept clean of
556	# unsecure data. Useful to shield the users of this validator from
557	# potential bogus data in the additional section. All unsigned data
558	# in the additional section is removed from secure messages.
559	# val-clean-additional: yes
560
561	# Turn permissive mode on to permit bogus messages. Thus, messages
562	# for which security checks failed will be returned to clients,
563	# instead of SERVFAIL. It still performs the security checks, which
564	# result in interesting log files and possibly the AD bit in
565	# replies if the message is found secure. The default is off.
566	# val-permissive-mode: no
567
568	# Ignore the CD flag in incoming queries and refuse them bogus data.
569	# Enable it if the only clients of unbound are legacy servers (w2008)
570	# that set CD but cannot validate themselves.
571	# ignore-cd-flag: no
572
573	# Serve expired responses from cache, with serve-expired-reply-ttl in
574	# the response, and then attempt to fetch the data afresh.
575	# serve-expired: no
576	#
577	# Limit serving of expired responses to configured seconds after
578	# expiration. 0 disables the limit.
579	# serve-expired-ttl: 0
580	#
581	# Set the TTL of expired records to the serve-expired-ttl value after a
582	# failed attempt to retrieve the record from upstream. This makes sure
583	# that the expired records will be served as long as there are queries
584	# for it.
585	# serve-expired-ttl-reset: no
586	#
587	# TTL value to use when replying with expired data.
588	# serve-expired-reply-ttl: 30
589	#
590	# Time in milliseconds before replying to the client with expired data.
591	# This essentially enables the serve-stale behavior as specified in
592	# draft-ietf-dnsop-serve-stale-10 that first tries to resolve before
593	# immediately responding with expired data.  0 disables this behavior.
594	# A recommended value is 1800.
595	# serve-expired-client-timeout: 0
596
597	# Have the validator log failed validations for your diagnosis.
598	# 0: off. 1: A line per failed user query. 2: With reason and bad IP.
599	# val-log-level: 0
600
601	# It is possible to configure NSEC3 maximum iteration counts per
602	# keysize. Keep this table very short, as linear search is done.
603	# A message with an NSEC3 with larger count is marked insecure.
604	# List in ascending order the keysize and count values.
605	# val-nsec3-keysize-iterations: "1024 150 2048 500 4096 2500"
606
607	# instruct the auto-trust-anchor-file probing to add anchors after ttl.
608	# add-holddown: 2592000 # 30 days
609
610	# instruct the auto-trust-anchor-file probing to del anchors after ttl.
611	# del-holddown: 2592000 # 30 days
612
613	# auto-trust-anchor-file probing removes missing anchors after ttl.
614	# If the value 0 is given, missing anchors are not removed.
615	# keep-missing: 31622400 # 366 days
616
617	# debug option that allows very small holddown times for key rollover,
618	# otherwise the RFC mandates probe intervals must be at least 1 hour.
619	# permit-small-holddown: no
620
621	# the amount of memory to use for the key cache.
622	# plain value in bytes or you can append k, m or G. default is "4Mb".
623	# key-cache-size: 4m
624
625	# the number of slabs to use for the key cache.
626	# the number of slabs must be a power of 2.
627	# more slabs reduce lock contention, but fragment memory usage.
628	# key-cache-slabs: 4
629
630	# the amount of memory to use for the negative cache (used for DLV).
631	# plain value in bytes or you can append k, m or G. default is "1Mb".
632	# neg-cache-size: 1m
633
634	# By default, for a number of zones a small default 'nothing here'
635	# reply is built-in.  Query traffic is thus blocked.  If you
636	# wish to serve such zone you can unblock them by uncommenting one
637	# of the nodefault statements below.
638	# You may also have to use domain-insecure: zone to make DNSSEC work,
639	# unless you have your own trust anchors for this zone.
640	# local-zone: "localhost." nodefault
641	# local-zone: "127.in-addr.arpa." nodefault
642	# local-zone: "1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa." nodefault
643	# local-zone: "onion." nodefault
644	# local-zone: "test." nodefault
645	# local-zone: "invalid." nodefault
646	# local-zone: "10.in-addr.arpa." nodefault
647	# local-zone: "16.172.in-addr.arpa." nodefault
648	# local-zone: "17.172.in-addr.arpa." nodefault
649	# local-zone: "18.172.in-addr.arpa." nodefault
650	# local-zone: "19.172.in-addr.arpa." nodefault
651	# local-zone: "20.172.in-addr.arpa." nodefault
652	# local-zone: "21.172.in-addr.arpa." nodefault
653	# local-zone: "22.172.in-addr.arpa." nodefault
654	# local-zone: "23.172.in-addr.arpa." nodefault
655	# local-zone: "24.172.in-addr.arpa." nodefault
656	# local-zone: "25.172.in-addr.arpa." nodefault
657	# local-zone: "26.172.in-addr.arpa." nodefault
658	# local-zone: "27.172.in-addr.arpa." nodefault
659	# local-zone: "28.172.in-addr.arpa." nodefault
660	# local-zone: "29.172.in-addr.arpa." nodefault
661	# local-zone: "30.172.in-addr.arpa." nodefault
662	# local-zone: "31.172.in-addr.arpa." nodefault
663	# local-zone: "168.192.in-addr.arpa." nodefault
664	# local-zone: "0.in-addr.arpa." nodefault
665	# local-zone: "254.169.in-addr.arpa." nodefault
666	# local-zone: "2.0.192.in-addr.arpa." nodefault
667	# local-zone: "100.51.198.in-addr.arpa." nodefault
668	# local-zone: "113.0.203.in-addr.arpa." nodefault
669	# local-zone: "255.255.255.255.in-addr.arpa." nodefault
670	# local-zone: "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa." nodefault
671	# local-zone: "d.f.ip6.arpa." nodefault
672	# local-zone: "8.e.f.ip6.arpa." nodefault
673	# local-zone: "9.e.f.ip6.arpa." nodefault
674	# local-zone: "a.e.f.ip6.arpa." nodefault
675	# local-zone: "b.e.f.ip6.arpa." nodefault
676	# local-zone: "8.b.d.0.1.0.0.2.ip6.arpa." nodefault
677	# And for 64.100.in-addr.arpa. to 127.100.in-addr.arpa.
678
679	# Add example.com into ipset
680	# local-zone: "example.com" ipset
681
682	# If unbound is running service for the local host then it is useful
683	# to perform lan-wide lookups to the upstream, and unblock the
684	# long list of local-zones above.  If this unbound is a dns server
685	# for a network of computers, disabled is better and stops information
686	# leakage of local lan information.
687	# unblock-lan-zones: no
688
689	# The insecure-lan-zones option disables validation for
690	# these zones, as if they were all listed as domain-insecure.
691	# insecure-lan-zones: no
692
693	# a number of locally served zones can be configured.
694	# 	local-zone: <zone> <type>
695	# 	local-data: "<resource record string>"
696	# o deny serves local data (if any), else, drops queries.
697	# o refuse serves local data (if any), else, replies with error.
698	# o static serves local data, else, nxdomain or nodata answer.
699	# o transparent gives local data, but resolves normally for other names
700	# o redirect serves the zone data for any subdomain in the zone.
701	# o nodefault can be used to normally resolve AS112 zones.
702	# o typetransparent resolves normally for other types and other names
703	# o inform acts like transparent, but logs client IP address
704	# o inform_deny drops queries and logs client IP address
705	# o inform_redirect redirects queries and logs client IP address
706	# o always_transparent, always_refuse, always_nxdomain, resolve in
707	#   that way but ignore local data for that name
708	# o noview breaks out of that view towards global local-zones.
709	#
710	# defaults are localhost address, reverse for 127.0.0.1 and ::1
711	# and nxdomain for AS112 zones. If you configure one of these zones
712	# the default content is omitted, or you can omit it with 'nodefault'.
713	#
714	# If you configure local-data without specifying local-zone, by
715	# default a transparent local-zone is created for the data.
716	#
717	# You can add locally served data with
718	# local-zone: "local." static
719	# local-data: "mycomputer.local. IN A 192.0.2.51"
720	# local-data: 'mytext.local TXT "content of text record"'
721	#
722	# You can override certain queries with
723	# local-data: "adserver.example.com A 127.0.0.1"
724	#
725	# You can redirect a domain to a fixed address with
726	# (this makes example.com, www.example.com, etc, all go to 192.0.2.3)
727	# local-zone: "example.com" redirect
728	# local-data: "example.com A 192.0.2.3"
729	#
730	# Shorthand to make PTR records, "IPv4 name" or "IPv6 name".
731	# You can also add PTR records using local-data directly, but then
732	# you need to do the reverse notation yourself.
733	# local-data-ptr: "192.0.2.3 www.example.com"
734
735	# tag a localzone with a list of tag names (in "" with spaces between)
736	# local-zone-tag: "example.com" "tag2 tag3"
737
738	# add a netblock specific override to a localzone, with zone type
739	# local-zone-override: "example.com" 192.0.2.0/24 refuse
740
741	# service clients over TLS (on the TCP sockets), with plain DNS inside
742	# the TLS stream.  Give the certificate to use and private key.
743	# default is "" (disabled).  requires restart to take effect.
744	# tls-service-key: "path/to/privatekeyfile.key"
745	# tls-service-pem: "path/to/publiccertfile.pem"
746	# tls-port: 853
747
748	# cipher setting for TLSv1.2
749	# tls-ciphers: "DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256"
750	# cipher setting for TLSv1.3
751	# tls-ciphersuites: "TLS_AES_128_GCM_SHA256:TLS_AES_128_CCM_8_SHA256:TLS_AES_128_CCM_SHA256:TLS_AES_256_GCM_SHA384:TLS_CHACHA20_POLY1305_SHA256"
752
753	# Use the SNI extension for TLS connections.  Default is yes.
754	# Changing the value requires a reload.
755	# tls-use-sni: yes
756
757	# Add the secret file for TLS Session Ticket.
758	# Secret file must be 80 bytes of random data.
759	# First key use to encrypt and decrypt TLS session tickets.
760	# Other keys use to decrypt only.
761	# requires restart to take effect.
762	# tls-session-ticket-keys: "path/to/secret_file1"
763	# tls-session-ticket-keys: "path/to/secret_file2"
764
765	# request upstream over TLS (with plain DNS inside the TLS stream).
766	# Default is no.  Can be turned on and off with unbound-control.
767	# tls-upstream: no
768
769	# Certificates used to authenticate connections made upstream.
770	# tls-cert-bundle: ""
771
772	# Add system certs to the cert bundle, from the Windows Cert Store
773	# tls-win-cert: no
774
775	# Also serve tls on these port numbers (eg. 443, ...), by listing
776	# tls-additional-port: portno for each of the port numbers.
777
778	# DNS64 prefix. Must be specified when DNS64 is use.
779	# Enable dns64 in module-config.  Used to synthesize IPv6 from IPv4.
780	# dns64-prefix: 64:ff9b::0/96
781
782	# DNS64 ignore AAAA records for these domains and use A instead.
783	# dns64-ignore-aaaa: "example.com"
784
785	# ratelimit for uncached, new queries, this limits recursion effort.
786	# ratelimiting is experimental, and may help against randomqueryflood.
787	# if 0(default) it is disabled, otherwise state qps allowed per zone.
788	# ratelimit: 0
789
790	# ratelimits are tracked in a cache, size in bytes of cache (or k,m).
791	# ratelimit-size: 4m
792	# ratelimit cache slabs, reduces lock contention if equal to cpucount.
793	# ratelimit-slabs: 4
794
795	# 0 blocks when ratelimited, otherwise let 1/xth traffic through
796	# ratelimit-factor: 10
797
798	# override the ratelimit for a specific domain name.
799	# give this setting multiple times to have multiple overrides.
800	# ratelimit-for-domain: example.com 1000
801	# override the ratelimits for all domains below a domain name
802	# can give this multiple times, the name closest to the zone is used.
803	# ratelimit-below-domain: com 1000
804
805	# global query ratelimit for all ip addresses.
806	# feature is experimental.
807	# if 0(default) it is disabled, otherwise states qps allowed per ip address
808	# ip-ratelimit: 0
809
810	# ip ratelimits are tracked in a cache, size in bytes of cache (or k,m).
811	# ip-ratelimit-size: 4m
812	# ip ratelimit cache slabs, reduces lock contention if equal to cpucount.
813	# ip-ratelimit-slabs: 4
814
815	# 0 blocks when ip is ratelimited, otherwise let 1/xth traffic through
816	# ip-ratelimit-factor: 10
817
818	# Limit the number of connections simultaneous from a netblock
819	# tcp-connection-limit: 192.0.2.0/24 12
820
821	# select from the fastest servers this many times out of 1000. 0 means
822	# the fast server select is disabled. prefetches are not sped up.
823	# fast-server-permil: 0
824	# the number of servers that will be used in the fast server selection.
825	# fast-server-num: 3
826
827	# Specific options for ipsecmod. unbound needs to be configured with
828	# --enable-ipsecmod for these to take effect.
829	#
830	# Enable or disable ipsecmod (it still needs to be defined in
831	# module-config above). Can be used when ipsecmod needs to be
832	# enabled/disabled via remote-control(below).
833	# ipsecmod-enabled: yes
834	#
835	# Path to executable external hook. It must be defined when ipsecmod is
836	# listed in module-config (above).
837	# ipsecmod-hook: "./my_executable"
838	#
839	# When enabled unbound will reply with SERVFAIL if the return value of
840	# the ipsecmod-hook is not 0.
841	# ipsecmod-strict: no
842	#
843	# Maximum time to live (TTL) for cached A/AAAA records with IPSECKEY.
844	# ipsecmod-max-ttl: 3600
845	#
846	# Reply with A/AAAA even if the relevant IPSECKEY is bogus. Mainly used for
847	# testing.
848	# ipsecmod-ignore-bogus: no
849	#
850	# Domains for which ipsecmod will be triggered. If not defined (default)
851	# all domains are treated as being whitelisted.
852	# ipsecmod-whitelist: "example.com"
853	# ipsecmod-whitelist: "nlnetlabs.nl"
854
855
856# Python config section. To enable:
857# o use --with-pythonmodule to configure before compiling.
858# o list python in the module-config string (above) to enable.
859#   It can be at the start, it gets validated results, or just before
860#   the iterator and process before DNSSEC validation.
861# o and give a python-script to run.
862python:
863	# Script file to load
864	# python-script: "@UNBOUND_SHARE_DIR@/ubmodule-tst.py"
865
866# Dynamic library config section. To enable:
867# o use --with-dynlibmodule to configure before compiling.
868# o list dynlib in the module-config string (above) to enable.
869#   It can be placed anywhere, the dynlib module is only a very thin wrapper
870#   to load modules dynamically.
871# o and give a dynlib-file to run. If more than one dynlib entry is listed in
872#   the module-config then you need one dynlib-file per instance.
873dynlib:
874	# Script file to load
875	# dynlib-file: "@UNBOUND_SHARE_DIR@/dynlib.so"
876
877# Remote control config section.
878remote-control:
879	# Enable remote control with unbound-control(8) here.
880	# set up the keys and certificates with unbound-control-setup.
881	# control-enable: no
882
883	# what interfaces are listened to for remote control.
884	# give 0.0.0.0 and ::0 to listen to all interfaces.
885	# set to an absolute path to use a unix local name pipe, certificates
886	# are not used for that, so key and cert files need not be present.
887	# control-interface: 127.0.0.1
888	# control-interface: ::1
889
890	# port number for remote control operations.
891	# control-port: 8953
892
893	# for localhost, you can disable use of TLS by setting this to "no"
894	# For local sockets this option is ignored, and TLS is not used.
895	# control-use-cert: "yes"
896
897	# unbound server key file.
898	# server-key-file: "@UNBOUND_RUN_DIR@/unbound_server.key"
899
900	# unbound server certificate file.
901	# server-cert-file: "@UNBOUND_RUN_DIR@/unbound_server.pem"
902
903	# unbound-control key file.
904	# control-key-file: "@UNBOUND_RUN_DIR@/unbound_control.key"
905
906	# unbound-control certificate file.
907	# control-cert-file: "@UNBOUND_RUN_DIR@/unbound_control.pem"
908
909# Stub zones.
910# Create entries like below, to make all queries for 'example.com' and
911# 'example.org' go to the given list of nameservers. list zero or more
912# nameservers by hostname or by ipaddress. If you set stub-prime to yes,
913# the list is treated as priming hints (default is no).
914# With stub-first yes, it attempts without the stub if it fails.
915# Consider adding domain-insecure: name and local-zone: name nodefault
916# to the server: section if the stub is a locally served zone.
917# stub-zone:
918#	name: "example.com"
919#	stub-addr: 192.0.2.68
920#	stub-prime: no
921#	stub-first: no
922#	stub-tls-upstream: no
923#	stub-no-cache: no
924# stub-zone:
925#	name: "example.org"
926#	stub-host: ns.example.com.
927
928# Forward zones
929# Create entries like below, to make all queries for 'example.com' and
930# 'example.org' go to the given list of servers. These servers have to handle
931# recursion to other nameservers. List zero or more nameservers by hostname
932# or by ipaddress. Use an entry with name "." to forward all queries.
933# If you enable forward-first, it attempts without the forward if it fails.
934# forward-zone:
935# 	name: "example.com"
936# 	forward-addr: 192.0.2.68
937# 	forward-addr: 192.0.2.73@5355  # forward to port 5355.
938# 	forward-first: no
939# 	forward-tls-upstream: no
940#	forward-no-cache: no
941# forward-zone:
942# 	name: "example.org"
943# 	forward-host: fwd.example.com
944
945# Authority zones
946# The data for these zones is kept locally, from a file or downloaded.
947# The data can be served to downstream clients, or used instead of the
948# upstream (which saves a lookup to the upstream).  The first example
949# has a copy of the root for local usage.  The second serves example.org
950# authoritatively.  zonefile: reads from file (and writes to it if you also
951# download it), master: fetches with AXFR and IXFR, or url to zonefile.
952# With allow-notify: you can give additional (apart from masters) sources of
953# notifies.
954# auth-zone:
955#	name: "."
956#	master: 199.9.14.201         # b.root-servers.net
957#	master: 192.33.4.12          # c.root-servers.net
958#	master: 199.7.91.13          # d.root-servers.net
959#	master: 192.5.5.241          # f.root-servers.net
960#	master: 192.112.36.4         # g.root-servers.net
961#	master: 193.0.14.129         # k.root-servers.net
962#	master: 192.0.47.132         # xfr.cjr.dns.icann.org
963#	master: 192.0.32.132         # xfr.lax.dns.icann.org
964#	master: 2001:500:200::b      # b.root-servers.net
965#	master: 2001:500:2::c        # c.root-servers.net
966#	master: 2001:500:2d::d       # d.root-servers.net
967#	master: 2001:500:2f::f       # f.root-servers.net
968#	master: 2001:500:12::d0d     # g.root-servers.net
969#	master: 2001:7fd::1          # k.root-servers.net
970#	master: 2620:0:2830:202::132 # xfr.cjr.dns.icann.org
971#	master: 2620:0:2d0:202::132  # xfr.lax.dns.icann.org
972#	fallback-enabled: yes
973#	for-downstream: no
974#	for-upstream: yes
975# auth-zone:
976#	name: "example.org"
977#	for-downstream: yes
978#	for-upstream: yes
979#	zonefile: "example.org.zone"
980
981# Views
982# Create named views. Name must be unique. Map views to requests using
983# the access-control-view option. Views can contain zero or more local-zone
984# and local-data options. Options from matching views will override global
985# options. Global options will be used if no matching view is found.
986# With view-first yes, it will try to answer using the global local-zone and
987# local-data elements if there is no view specific match.
988# view:
989#	name: "viewname"
990#	local-zone: "example.com" redirect
991#	local-data: "example.com A 192.0.2.3"
992#	local-data-ptr: "192.0.2.3 www.example.com"
993#	view-first: no
994# view:
995#	name: "anotherview"
996#	local-zone: "example.com" refuse
997
998# DNSCrypt
999# Caveats:
1000# 1. the keys/certs cannot be produced by unbound. You can use dnscrypt-wrapper
1001#   for this: https://github.com/cofyc/dnscrypt-wrapper/blob/master/README.md#usage
1002# 2. dnscrypt channel attaches to an interface. you MUST set interfaces to
1003#   listen on `dnscrypt-port` with the follo0wing snippet:
1004# server:
1005#     interface: 0.0.0.0@443
1006#     interface: ::0@443
1007#
1008# Finally, `dnscrypt` config has its own section.
1009# dnscrypt:
1010#     dnscrypt-enable: yes
1011#     dnscrypt-port: 443
1012#     dnscrypt-provider: 2.dnscrypt-cert.example.com.
1013#     dnscrypt-secret-key: /path/unbound-conf/keys1/1.key
1014#     dnscrypt-secret-key: /path/unbound-conf/keys2/1.key
1015#     dnscrypt-provider-cert: /path/unbound-conf/keys1/1.cert
1016#     dnscrypt-provider-cert: /path/unbound-conf/keys2/1.cert
1017
1018# CacheDB
1019# Enable external backend DB as auxiliary cache.  Specify the backend name
1020# (default is "testframe", which has no use other than for debugging and
1021# testing) and backend-specific options.  The 'cachedb' module must be
1022# included in module-config, just before the iterator module.
1023# cachedb:
1024#     backend: "testframe"
1025#     # secret seed string to calculate hashed keys
1026#     secret-seed: "default"
1027#
1028#     # For "redis" backend:
1029#     # redis server's IP address or host name
1030#     redis-server-host: 127.0.0.1
1031#     # redis server's TCP port
1032#     redis-server-port: 6379
1033#     # timeout (in ms) for communication with the redis server
1034#     redis-timeout: 100
1035#     # set timeout on redis records based on DNS response TTL
1036#     redis-expire-records: no
1037
1038# IPSet
1039# Add specify domain into set via ipset.
1040# Note: To enable ipset unbound needs to run as root user.
1041# ipset:
1042#     # set name for ip v4 addresses
1043#     name-v4: "list-v4"
1044#     # set name for ip v6 addresses
1045#     name-v6: "list-v6"
1046#
1047
1048# Dnstap logging support, if compiled in.  To enable, set the dnstap-enable
1049# to yes and also some of dnstap-log-..-messages to yes.  And select an
1050# upstream log destination, by socket path, TCP or TLS destination.
1051# dnstap:
1052# 	dnstap-enable: no
1053# 	# if set to yes frame streams will be used in bidirectional mode
1054# 	dnstap-bidirectional: yes
1055# 	dnstap-socket-path: "@DNSTAP_SOCKET_PATH@"
1056# 	# if "" use the unix socket in dnstap-socket-path, otherwise,
1057# 	# set it to "IPaddress[@port]" of the destination.
1058# 	dnstap-ip: ""
1059# 	# if set to yes if you want to use TLS to dnstap-ip, no for TCP.
1060# 	dnstap-tls: yes
1061# 	# name for authenticating the upstream server. or "" disabled.
1062# 	dnstap-tls-server-name: ""
1063# 	# if "", it uses the cert bundle from the main unbound config.
1064# 	dnstap-tls-cert-bundle: ""
1065# 	# key file for client authentication, or "" disabled.
1066# 	dnstap-tls-client-key-file: ""
1067# 	# cert file for client authentication, or "" disabled.
1068# 	dnstap-tls-client-cert-file: ""
1069# 	dnstap-send-identity: no
1070# 	dnstap-send-version: no
1071# 	# if "" it uses the hostname.
1072# 	dnstap-identity: ""
1073# 	# if "" it uses the package version.
1074# 	dnstap-version: ""
1075# 	dnstap-log-resolver-query-messages: no
1076# 	dnstap-log-resolver-response-messages: no
1077# 	dnstap-log-client-query-messages: no
1078# 	dnstap-log-client-response-messages: no
1079# 	dnstap-log-forwarder-query-messages: no
1080# 	dnstap-log-forwarder-response-messages: no
1081
1082# Response Policy Zones
1083# RPZ policies. Applied in order of configuration. QNAME and Response IP
1084# Address trigger are the only supported triggers. Supported actions are:
1085# NXDOMAIN, NODATA, PASSTHRU, DROP and Local Data. Policies can be loaded from
1086# file, using zone transfer, or using HTTP. The respip module needs to be added
1087# to the module-config, e.g.: module-config: "respip validator iterator".
1088# rpz:
1089#     name: "rpz.example.com"
1090#     zonefile: "rpz.example.com"
1091#     master: 192.0.2.0
1092#     allow-notify: 192.0.2.0/32
1093#     url: http://www.example.com/rpz.example.org.zone
1094#     rpz-action-override: cname
1095#     rpz-cname-override: www.example.org
1096#     rpz-log: yes
1097#     rpz-log-name: "example policy"
1098#     tags: "example"
1099