# # Example configuration file. # # See unbound.conf(5) man page # # this is a comment. # Use this anywhere in the file to include other text into this file. #include: "otherfile.conf" # Use this anywhere in the file to include other text, that explicitly starts a # clause, into this file. Text after this directive needs to start a clause. #include-toplevel: "otherfile.conf" # The server clause sets the main parameters. server: # whitespace is not necessary, but looks cleaner. # verbosity number, 0 is least verbose. 1 is default. verbosity: 1 # print statistics to the log (for every thread) every N seconds. # Set to "" or 0 to disable. Default is disabled. # Needs to be disabled for munin plugin statistics-interval: 0 # enable shm for stats, default no. if you enable also enable # statistics-interval, every time it also writes stats to the # shared memory segment keyed with shm-key. # shm-enable: no # shm for stats uses this key, and key+1 for the shared mem segment. # shm-key: 11777 # enable cumulative statistics, without clearing them after printing. # Needs to be disabled for munin plugin statistics-cumulative: no # enable extended statistics (query types, answer codes, status) # printed from unbound-control. default off, because of speed. # Needs to be enabled for munin plugin extended-statistics: yes # number of threads to create. 1 disables threading. num-threads: 4 # specify the interfaces to answer queries from by ip-address. # The default is to listen to localhost (127.0.0.1 and ::1). # specify 0.0.0.0 and ::0 to bind to all available interfaces. # specify every interface[@port] on a new 'interface:' labelled line. # The listen interfaces are not changed on reload, only on restart. # interface: 0.0.0.0 # interface: ::0 # interface: 192.0.2.153 # interface: 192.0.2.154 # interface: 192.0.2.154@5003 # interface: 2001:DB8::5 # # for dns over tls and raw dns over port 80 # interface: 0.0.0.0@443 # interface: ::0@443 # interface: 0.0.0.0@80 # interface: ::0@80 # enable this feature to copy the source address of queries to reply. # Socket options are not supported on all platforms. experimental. # interface-automatic: yes # # NOTE: Enable this option when specifying interface 0.0.0.0 or ::0 # NOTE: Disabled per Fedora policy not to listen to * on default install # NOTE: If deploying on non-default port, eg 80/443, this needs to be disabled interface-automatic: no # port to answer queries from # port: 53 # specify the interfaces to send outgoing queries to authoritative # server from by ip-address. If none, the default (all) interface # is used. Specify every interface on a 'outgoing-interface:' line. # outgoing-interface: 192.0.2.153 # outgoing-interface: 2001:DB8::5 # outgoing-interface: 2001:DB8::6 # Specify a netblock to use remainder 64 bits as random bits for # upstream queries. Uses freebind option (Linux). # outgoing-interface: 2001:DB8::/64 # Also (Linux:) ip -6 addr add 2001:db8::/64 dev lo # And: ip -6 route add local 2001:db8::/64 dev lo # And set prefer-ip6: yes to use the ip6 randomness from a netblock. # Set this to yes to prefer ipv6 upstream servers over ipv4. # prefer-ip6: no # Prefer ipv4 upstream servers, even if ipv6 is available. # prefer-ip4: no # number of ports to allocate per thread, determines the size of the # port range that can be open simultaneously. About double the # num-queries-per-thread, or, use as many as the OS will allow you. # outgoing-range: 4096 # permit Unbound to use this port number or port range for # making outgoing queries, using an outgoing interface. # Only ephemeral ports are allowed by SElinux outgoing-port-permit: 32768-60999 # deny Unbound the use this of port number or port range for # making outgoing queries, using an outgoing interface. # Use this to make sure Unbound does not grab a UDP port that some # other server on this computer needs. The default is to avoid # IANA-assigned port numbers. # If multiple outgoing-port-permit and outgoing-port-avoid options # are present, they are processed in order. # Our SElinux policy does not allow non-ephemeral ports to be used outgoing-port-avoid: 0-32767 outgoing-port-avoid: 61000-65535 # number of outgoing simultaneous tcp buffers to hold per thread. # outgoing-num-tcp: 10 # number of incoming simultaneous tcp buffers to hold per thread. # incoming-num-tcp: 10 # buffer size for UDP port 53 incoming (SO_RCVBUF socket option). # 0 is system default. Use 4m to catch query spikes for busy servers. # so-rcvbuf: 0 # buffer size for UDP port 53 outgoing (SO_SNDBUF socket option). # 0 is system default. Use 4m to handle spikes on very busy servers. # so-sndbuf: 0 # use SO_REUSEPORT to distribute queries over threads. # at extreme load it could be better to turn it off to distribute even. so-reuseport: yes # use IP_TRANSPARENT so the interface: addresses can be non-local # and you can config non-existing IPs that are going to work later on # (uses IP_BINDANY on FreeBSD). ip-transparent: yes # use IP_FREEBIND so the interface: addresses can be non-local # and you can bind to nonexisting IPs and interfaces that are down. # Linux only. On Linux you also have ip-transparent that is similar. # ip-freebind: no # the value of the Differentiated Services Codepoint (DSCP) # in the differentiated services field (DS) of the outgoing # IP packets # ip-dscp: 0 # EDNS reassembly buffer to advertise to UDP peers (the actual buffer # is set with msg-buffer-size). 1472 can solve fragmentation (timeouts) # edns-buffer-size: 1232 # Maximum UDP response size (not applied to TCP response). # Suggested values are 512 to 4096. Default is 4096. 65536 disables it. # 3072 causes +dnssec any isc.org queries to need TC=1. # Helps mitigating DDOS max-udp-size: 3072 # max memory to use for stream(tcp and tls) waiting result buffers. # stream-wait-size: 4m # buffer size for handling DNS data. No messages larger than this # size can be sent or received, by UDP or TCP. In bytes. # msg-buffer-size: 65552 # the amount of memory to use for the message cache. # plain value in bytes or you can append k, m or G. default is "4Mb". # msg-cache-size: 4m # the number of slabs to use for the message cache. # the number of slabs must be a power of 2. # more slabs reduce lock contention, but fragment memory usage. # msg-cache-slabs: 4 # the number of queries that a thread gets to service. # num-queries-per-thread: 1024 # if very busy, 50% queries run to completion, 50% get timeout in msec # jostle-timeout: 200 # msec to wait before close of port on timeout UDP. 0 disables. # delay-close: 0 # perform connect for UDP sockets to mitigate ICMP side channel. # udp-connect: yes # The number of retries, per upstream nameserver in a delegation, when # a throwaway response (also timeouts) is received. # outbound-msg-retry: 5 # msec for waiting for an unknown server to reply. Increase if you # are behind a slow satellite link, to eg. 1128. # unknown-server-time-limit: 376 # the amount of memory to use for the RRset cache. # plain value in bytes or you can append k, m or G. default is "4Mb". # rrset-cache-size: 4m # the number of slabs to use for the RRset cache. # the number of slabs must be a power of 2. # more slabs reduce lock contention, but fragment memory usage. # rrset-cache-slabs: 4 # the time to live (TTL) value lower bound, in seconds. Default 0. # If more than an hour could easily give trouble due to stale data. # cache-min-ttl: 0 # the time to live (TTL) value cap for RRsets and messages in the # cache. Items are not cached for longer. In seconds. # cache-max-ttl: 86400 # the time to live (TTL) value cap for negative responses in the cache # cache-max-negative-ttl: 3600 # the time to live (TTL) value for cached roundtrip times, lameness and # EDNS version information for hosts. In seconds. # infra-host-ttl: 900 # minimum wait time for responses, increase if uplink is long. In msec. # infra-cache-min-rtt: 50 # maximum wait time for responses. In msec. # infra-cache-max-rtt: 120000 # enable to make server probe down hosts more frequently. # infra-keep-probing: no # the number of slabs to use for the Infrastructure cache. # the number of slabs must be a power of 2. # more slabs reduce lock contention, but fragment memory usage. # infra-cache-slabs: 4 # the maximum number of hosts that are cached (roundtrip, EDNS, lame). # infra-cache-numhosts: 10000 # define a number of tags here, use with local-zone, access-control. # repeat the define-tag statement to add additional tags. # define-tag: "tag1 tag2 tag3" # Enable IPv4, "yes" or "no". # do-ip4: yes # Enable IPv6, "yes" or "no". # do-ip6: yes # Enable UDP, "yes" or "no". # NOTE: if setting up an Unbound on tls443 for public use, you might want to # disable UDP to avoid being used in DNS amplification attacks. # do-udp: yes # Enable TCP, "yes" or "no". # do-tcp: yes # upstream connections use TCP only (and no UDP), "yes" or "no" # useful for tunneling scenarios, default no. # tcp-upstream: no # upstream connections also use UDP (even if do-udp is no). # useful if if you want UDP upstream, but don't provide UDP downstream. # udp-upstream-without-downstream: no # Maximum segment size (MSS) of TCP socket on which the server # responds to queries. Default is 0, system default MSS. # tcp-mss: 0 # Maximum segment size (MSS) of TCP socket for outgoing queries. # Default is 0, system default MSS. # outgoing-tcp-mss: 0 # Idle TCP timeout, connection closed in milliseconds # tcp-idle-timeout: 30000 # Enable EDNS TCP keepalive option. edns-tcp-keepalive: yes # Timeout for EDNS TCP keepalive, in msec. # edns-tcp-keepalive-timeout: 120000 # Fedora note: do not activate this - can cause a crash # Use systemd socket activation for UDP, TCP, and control sockets. # use-systemd: no # Detach from the terminal, run in background, "yes" or "no". # Set the value to "no" when Unbound runs as systemd service. # do-daemonize: yes # control which clients are allowed to make (recursive) queries # to this server. Specify classless netblocks with /size and action. # By default everything is refused, except for localhost. # Choose deny (drop message), refuse (polite error reply), # allow (recursive ok), allow_setrd (recursive ok, rd bit is forced on), # allow_snoop (recursive and nonrecursive ok) # deny_non_local (drop queries unless can be answered from local-data) # refuse_non_local (like deny_non_local but polite error reply). # access-control: 0.0.0.0/0 refuse # access-control: 127.0.0.0/8 allow # access-control: ::0/0 refuse # access-control: ::1 allow # access-control: ::ffff:127.0.0.1 allow # tag access-control with list of tags (in "" with spaces between) # Clients using this access control element use localzones that # are tagged with one of these tags. # access-control-tag: 192.0.2.0/24 "tag2 tag3" # set action for particular tag for given access control element # if you have multiple tag values, the tag used to lookup the action # is the first tag match between access-control-tag and local-zone-tag # where "first" comes from the order of the define-tag values. # access-control-tag-action: 192.0.2.0/24 tag3 refuse # set redirect data for particular tag for access control element # access-control-tag-data: 192.0.2.0/24 tag2 "A 127.0.0.1" # Set view for access control element # access-control-view: 192.0.2.0/24 viewname # if given, a chroot(2) is done to the given directory. # i.e. you can chroot to the working directory, for example, # for extra security, but make sure all files are in that directory. # # If chroot is enabled, you should pass the configfile (from the # commandline) as a full path from the original root. After the # chroot has been performed the now defunct portion of the config # file path is removed to be able to reread the config after a reload. # # All other file paths (working dir, logfile, roothints, and # key files) can be specified in several ways: # o as an absolute path relative to the new root. # o as a relative path to the working directory. # o as an absolute path relative to the original root. # In the last case the path is adjusted to remove the unused portion. # # The pid file can be absolute and outside of the chroot, it is # written just prior to performing the chroot and dropping permissions. # # Additionally, Unbound may need to access /dev/urandom (for entropy). # How to do this is specific to your OS. # # If you give "" no chroot is performed. The path must not end in a /. # chroot: "/var/lib/unbound" chroot: "" # if given, user privileges are dropped (after binding port), # and the given username is assumed. Default is user "unbound". # If you give "" no privileges are dropped. username: "unbound" # the working directory. The relative files in this config are # relative to this directory. If you give "" the working directory # is not changed. # If you give a server: directory: dir before include: file statements # then those includes can be relative to the working directory. directory: "/etc/unbound" # the log file, "" means log to stderr. # Use of this option sets use-syslog to "no". # logfile: "" # Log to syslog(3) if yes. The log facility LOG_DAEMON is used to # log to. If yes, it overrides the logfile. # use-syslog: yes # Log identity to report. if empty, defaults to the name of argv[0] # (usually "unbound"). # log-identity: "" # print UTC timestamp in ascii to logfile, default is epoch in seconds. log-time-ascii: yes # print one line with time, IP, name, type, class for every query. # log-queries: no # print one line per reply, with time, IP, name, type, class, rcode, # timetoresolve, fromcache and responsesize. # log-replies: no # log with tag 'query' and 'reply' instead of 'info' for # filtering log-queries and log-replies from the log. # log-tag-queryreply: no # log the local-zone actions, like local-zone type inform is enabled # also for the other local zone types. # log-local-actions: no # print log lines that say why queries return SERVFAIL to clients. # log-servfail: no # the pid file. Can be an absolute path outside of chroot/work dir. pidfile: "/var/run/unbound/unbound.pid" # file to read root hints from. # get one from https://www.internic.net/domain/named.cache # root-hints: "" # enable to not answer id.server and hostname.bind queries. # hide-identity: no # enable to not answer version.server and version.bind queries. # hide-version: no # enable to not answer trustanchor.unbound queries. # hide-trustanchor: no # enable to not set the User-Agent HTTP header. # hide-http-user-agent: no # the identity to report. Leave "" or default to return hostname. # identity: "" # the version to report. Leave "" or default to return package version. # version: "" # NSID identity (hex string, or "ascii_somestring"). default disabled. # nsid: "aabbccdd" # User-Agent HTTP header to use. Leave "" or default to use package name # and version. # http-user-agent: "" # the target fetch policy. # series of integers describing the policy per dependency depth. # The number of values in the list determines the maximum dependency # depth the recursor will pursue before giving up. Each integer means: # -1 : fetch all targets opportunistically, # 0: fetch on demand, # positive value: fetch that many targets opportunistically. # Enclose the list of numbers between quotes (""). # target-fetch-policy: "3 2 1 0 0" # Harden against very small EDNS buffer sizes. # harden-short-bufsize: yes # Harden against unseemly large queries. # harden-large-queries: no # Harden against out of zone rrsets, to avoid spoofing attempts. harden-glue: yes # Harden against receiving dnssec-stripped data. If you turn it # off, failing to validate dnskey data for a trustanchor will # trigger insecure mode for that zone (like without a trustanchor). # Default on, which insists on dnssec data for trust-anchored zones. harden-dnssec-stripped: yes # Harden against queries that fall under dnssec-signed nxdomain names. harden-below-nxdomain: yes # Harden the referral path by performing additional queries for # infrastructure data. Validates the replies (if possible). # Default off, because the lookups burden the server. Experimental # implementation of draft-wijngaards-dnsext-resolver-side-mitigation. harden-referral-path: yes # Harden against algorithm downgrade when multiple algorithms are # advertised in the DS record. If no, allows the weakest algorithm # to validate the zone. # harden-algo-downgrade: no # Sent minimum amount of information to upstream servers to enhance # privacy. Only sent minimum required labels of the QNAME and set QTYPE # to A when possible. qname-minimisation: yes # QNAME minimisation in strict mode. Do not fall-back to sending full # QNAME to potentially broken nameservers. A lot of domains will not be # resolvable when this option in enabled. # This option only has effect when qname-minimisation is enabled. # qname-minimisation-strict: no # Aggressive NSEC uses the DNSSEC NSEC chain to synthesize NXDOMAIN # and other denials, using information from previous NXDOMAINs answers. aggressive-nsec: yes # Use 0x20-encoded random bits in the query to foil spoof attempts. # This feature is an experimental implementation of draft dns-0x20. # use-caps-for-id: no # Domains (and domains in them) without support for dns-0x20 and # the fallback fails because they keep sending different answers. # caps-exempt: "licdn.com" # caps-exempt: "senderbase.org" # Enforce privacy of these addresses. Strips them away from answers. # It may cause DNSSEC validation to additionally mark it as bogus. # Protects against 'DNS Rebinding' (uses browser as network proxy). # Only 'private-domain' and 'local-data' names are allowed to have # these private addresses. No default. # private-address: 10.0.0.0/8 # private-address: 172.16.0.0/12 # private-address: 192.168.0.0/16 # private-address: 169.254.0.0/16 # private-address: fd00::/8 # private-address: fe80::/10 # private-address: ::ffff:0:0/96 # Allow the domain (and its subdomains) to contain private addresses. # local-data statements are allowed to contain private addresses too. # private-domain: "example.com" # If nonzero, unwanted replies are not only reported in statistics, # but also a running total is kept per thread. If it reaches the # threshold, a warning is printed and a defensive action is taken, # the cache is cleared to flush potential poison out of it. # A suggested value is 10000000, the default is 0 (turned off). unwanted-reply-threshold: 10000000 # Do not query the following addresses. No DNS queries are sent there. # List one address per entry. List classless netblocks with /size, # do-not-query-address: 127.0.0.1/8 # do-not-query-address: ::1 # if yes, the above default do-not-query-address entries are present. # if no, localhost can be queried (for testing and debugging). # do-not-query-localhost: yes # if yes, perform prefetching of almost expired message cache entries. prefetch: yes # if yes, perform key lookups adjacent to normal lookups. prefetch-key: yes # deny queries of type ANY with an empty response. deny-any: yes # if yes, Unbound rotates RRSet order in response. rrset-roundrobin: yes # if yes, Unbound doesn't insert authority/additional sections # into response messages when those sections are not required. minimal-responses: yes # true to disable DNSSEC lameness check in iterator. # disable-dnssec-lame-check: no # module configuration of the server. A string with identifiers # separated by spaces. Syntax: "[dns64] [validator] iterator" # most modules have to be listed at the beginning of the line, # except cachedb(just before iterator), and python (at the beginning, # or, just before the iterator). module-config: "ipsecmod validator iterator" # File with trusted keys, kept uptodate using RFC5011 probes, # initial file like trust-anchor-file, then it stores metadata. # Use several entries, one per domain name, to track multiple zones. # # If you want to perform DNSSEC validation, run unbound-anchor before # you start Unbound (i.e. in the system boot scripts). And enable: # Please note usage of unbound-anchor root anchor is at your own risk # and under the terms of our LICENSE (see that file in the source). # auto-trust-anchor-file: "/var/lib/unbound/root.key" # trust anchor signaling sends a RFC8145 key tag query after priming. trust-anchor-signaling: yes # Root key trust anchor sentinel (draft-ietf-dnsop-kskroll-sentinel) root-key-sentinel: yes # File with trusted keys for validation. Specify more than one file # with several entries, one file per entry. # Zone file format, with DS and DNSKEY entries. # Note this gets out of date, use auto-trust-anchor-file please. # trust-anchor-file: "" # Trusted key for validation. DS or DNSKEY. specify the RR on a # single line, surrounded by "". TTL is ignored. class is IN default. # Note this gets out of date, use auto-trust-anchor-file please. # (These examples are from August 2007 and may not be valid anymore). # trust-anchor: "nlnetlabs.nl. DNSKEY 257 3 5 AQPzzTWMz8qSWIQlfRnPckx2BiVmkVN6LPupO3mbz7FhLSnm26n6iG9N Lby97Ji453aWZY3M5/xJBSOS2vWtco2t8C0+xeO1bc/d6ZTy32DHchpW 6rDH1vp86Ll+ha0tmwyy9QP7y2bVw5zSbFCrefk8qCUBgfHm9bHzMG1U BYtEIQ==" # trust-anchor: "jelte.nlnetlabs.nl. DS 42860 5 1 14D739EB566D2B1A5E216A0BA4D17FA9B038BE4A" # File with trusted keys for validation. Specify more than one file # with several entries, one file per entry. Like trust-anchor-file # but has a different file format. Format is BIND-9 style format, # the trusted-keys { name flag proto algo "key"; }; clauses are read. # you need external update procedures to track changes in keys. # trusted-keys-file: "" # trusted-keys-file: /etc/unbound/keys.d/*.key # GNUNUX define in risotto.conf auto-trust-anchor-file: "/var/lib/unbound/root.key" # Ignore chain of trust. Domain is treated as insecure. # domain-insecure: "example.com" #>GNUNUX %for %%authority in %%unbound_forward_address %for %%zone in %%authority.unbound_forward_zones domain-insecure: "%%zone" %end for %end for # # local-data: "" # o deny serves local data (if any), else, drops queries. # o refuse serves local data (if any), else, replies with error. # o static serves local data, else, nxdomain or nodata answer. # o transparent gives local data, but resolves normally for other names # o redirect serves the zone data for any subdomain in the zone. # o nodefault can be used to normally resolve AS112 zones. # o typetransparent resolves normally for other types and other names # o inform acts like transparent, but logs client IP address # o inform_deny drops queries and logs client IP address # o inform_redirect redirects queries and logs client IP address # o always_transparent, always_refuse, always_nxdomain, always_nodata, # always_deny resolve in that way but ignore local data for # that name # o always_null returns 0.0.0.0 or ::0 for any name in the zone. # o noview breaks out of that view towards global local-zones. # # defaults are localhost address, reverse for 127.0.0.1 and ::1 # and nxdomain for AS112 zones. If you configure one of these zones # the default content is omitted, or you can omit it with 'nodefault'. # # If you configure local-data without specifying local-zone, by # default a transparent local-zone is created for the data. # # You can add locally served data with # local-zone: "local." static # local-data: "mycomputer.local. IN A 192.0.2.51" # local-data: 'mytext.local TXT "content of text record"' # # You can override certain queries with # local-data: "adserver.example.com A 127.0.0.1" # # You can redirect a domain to a fixed address with # (this makes example.com, www.example.com, etc, all go to 192.0.2.3) # local-zone: "example.com" redirect # local-data: "example.com A 192.0.2.3" # # Shorthand to make PTR records, "IPv4 name" or "IPv6 name". # You can also add PTR records using local-data directly, but then # you need to do the reverse notation yourself. # local-data-ptr: "192.0.2.3 www.example.com" include: /etc/unbound/local.d/*.conf # tag a localzone with a list of tag names (in "" with spaces between) # local-zone-tag: "example.com" "tag2 tag3" # add a netblock specific override to a localzone, with zone type # local-zone-override: "example.com" 192.0.2.0/24 refuse # service clients over TLS (on the TCP sockets) with plain DNS inside # the TLS stream, and over HTTPS using HTTP/2 as specified in RFC8484. # Give the certificate to use and private key. # default is "" (disabled). requires restart to take effect. # tls-service-key: "/etc/unbound/unbound_server.key" # tls-service-pem: "/etc/unbound/unbound_server.pem" # tls-port: 853 # https-port: 443 # cipher setting for TLSv1.2 # 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" # cipher setting for TLSv1.3 # 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" # Fedora/RHEL: use system-wide crypto policies tls-ciphers: "PROFILE=SYSTEM" # TODO: ask system-wide crypto people what to use here #tls-ciphersuites: "PROFILE=SYSTEM" # does not work # Pad responses to padded queries received over TLS # pad-responses: yes # Padded responses will be padded to the closest multiple of this size. # pad-responses-block-size: 468 # Use the SNI extension for TLS connections. Default is yes. # Changing the value requires a reload. # tls-use-sni: yes # Add the secret file for TLS Session Ticket. # Secret file must be 80 bytes of random data. # First key use to encrypt and decrypt TLS session tickets. # Other keys use to decrypt only. # requires restart to take effect. # tls-session-ticket-keys: "path/to/secret_file1" # tls-session-ticket-keys: "path/to/secret_file2" # request upstream over TLS (with plain DNS inside the TLS stream). # Default is no. Can be turned on and off with unbound-control. # tls-upstream: no # Certificates used to authenticate connections made upstream. # tls-cert-bundle: "" # Add system certs to the cert bundle, from the Windows Cert Store # tls-win-cert: no # and on other systems, the default openssl certificates # tls-system-cert: no # Pad queries over TLS upstreams # pad-queries: yes # Padded queries will be padded to the closest multiple of this size. # pad-queries-block-size: 128 # Also serve tls on these port numbers (eg. 443, ...), by listing # tls-additional-port: portno for each of the port numbers. # HTTP endpoint to provide DNS-over-HTTPS service on. # http-endpoint: "/dns-query" # HTTP/2 SETTINGS_MAX_CONCURRENT_STREAMS value to use. # http-max-streams: 100 # Maximum number of bytes used for all HTTP/2 query buffers. # http-query-buffer-size: 4m # Maximum number of bytes used for all HTTP/2 response buffers. # http-response-buffer-size: 4m # Set TCP_NODELAY socket option on sockets used for DNS-over-HTTPS # service. # http-nodelay: yes # Disable TLS for DNS-over-HTTP downstream service. # http-notls-downstream: no # DNS64 prefix. Must be specified when DNS64 is use. # Enable dns64 in module-config. Used to synthesize IPv6 from IPv4. # dns64-prefix: 64:ff9b::0/96 # DNS64 ignore AAAA records for these domains and use A instead. # dns64-ignore-aaaa: "example.com" # ratelimit for uncached, new queries, this limits recursion effort. # ratelimiting is experimental, and may help against randomqueryflood. # if 0(default) it is disabled, otherwise state qps allowed per zone. # ratelimit: 0 # ratelimits are tracked in a cache, size in bytes of cache (or k,m). # ratelimit-size: 4m # ratelimit cache slabs, reduces lock contention if equal to cpucount. # ratelimit-slabs: 4 # 0 blocks when ratelimited, otherwise let 1/xth traffic through # ratelimit-factor: 10 # Aggressive rate limit when the limit is reached and until demand has # decreased in a 2 second rate window. # ratelimit-backoff: no # override the ratelimit for a specific domain name. # give this setting multiple times to have multiple overrides. # ratelimit-for-domain: example.com 1000 # override the ratelimits for all domains below a domain name # can give this multiple times, the name closest to the zone is used. # ratelimit-below-domain: com 1000 # global query ratelimit for all ip addresses. # feature is experimental. # if 0(default) it is disabled, otherwise states qps allowed per ip address # ip-ratelimit: 0 # ip ratelimits are tracked in a cache, size in bytes of cache (or k,m). # ip-ratelimit-size: 4m # ip ratelimit cache slabs, reduces lock contention if equal to cpucount. # ip-ratelimit-slabs: 4 # 0 blocks when ip is ratelimited, otherwise let 1/xth traffic through # ip-ratelimit-factor: 10 # Aggressive rate limit when the limit is reached and until demand has # decreased in a 2 second rate window. # ip-ratelimit-backoff: no # Limit the number of connections simultaneous from a netblock # tcp-connection-limit: 192.0.2.0/24 12 # select from the fastest servers this many times out of 1000. 0 means # the fast server select is disabled. prefetches are not sped up. # fast-server-permil: 0 # the number of servers that will be used in the fast server selection. # fast-server-num: 3 # Enable to attach Extended DNS Error codes (RFC8914) to responses. ede: yes # Enable to attach an Extended DNS Error (RFC8914) Code 3 - Stale # Answer as EDNS0 option to expired responses. # Note that the ede option above needs to be enabled for this to work. ede-serve-expired: yes # Specific options for ipsecmod. Unbound needs to be configured with # --enable-ipsecmod for these to take effect. # # Enable or disable ipsecmod (it still needs to be defined in # module-config above). Can be used when ipsecmod needs to be # enabled/disabled via remote-control(below). # Fedora: module will be enabled on-demand by libreswan ipsecmod-enabled: no # Path to executable external hook. It must be defined when ipsecmod is # listed in module-config (above). # ipsecmod-hook: "./my_executable" ipsecmod-hook:/usr/libexec/ipsec/_unbound-hook # When enabled Unbound will reply with SERVFAIL if the return value of # the ipsecmod-hook is not 0. # ipsecmod-strict: no # # Maximum time to live (TTL) for cached A/AAAA records with IPSECKEY. # ipsecmod-max-ttl: 3600 # # Reply with A/AAAA even if the relevant IPSECKEY is bogus. Mainly used for # testing. # ipsecmod-ignore-bogus: no # # Domains for which ipsecmod will be triggered. If not defined (default) # all domains are treated as being allowed. # ipsecmod-allow: "example.com" # ipsecmod-allow: "nlnetlabs.nl" # Timeout for REUSE entries in milliseconds. # tcp-reuse-timeout: 60000 # Max number of queries on a reuse connection. # max-reuse-tcp-queries: 200 # Timeout in milliseconds for TCP queries to auth servers. # tcp-auth-query-timeout: 3000 # Python config section. To enable: # o use --with-pythonmodule to configure before compiling. # o list python in the module-config string (above) to enable. # It can be at the start, it gets validated results, or just before # the iterator and process before DNSSEC validation. # o and give a python-script to run. python: # Script file to load # python-script: "/etc/unbound/ubmodule-tst.py" # Dynamic library config section. To enable: # o use --with-dynlibmodule to configure before compiling. # o list dynlib in the module-config string (above) to enable. # It can be placed anywhere, the dynlib module is only a very thin wrapper # to load modules dynamically. # o and give a dynlib-file to run. If more than one dynlib entry is listed in # the module-config then you need one dynlib-file per instance. dynlib: # Script file to load # dynlib-file: "/etc/unbound/dynlib.so" # Remote control config section. remote-control: # Enable remote control with unbound-control(8) here. # set up the keys and certificates with unbound-control-setup. # Note: required for unbound-munin package control-enable: yes # Set to no and use an absolute path as control-interface to use # a unix local named pipe for unbound-control. # control-use-cert: yes # what interfaces are listened to for remote control. # give 0.0.0.0 and ::0 to listen to all interfaces. # set to an absolute path to use a unix local name pipe, certificates # are not used for that, so key and cert files need not be present. # control-interface: 127.0.0.1 # control-interface: ::1 # port number for remote control operations. # control-port: 8953 # for localhost, you can disable use of TLS by setting this to "no" # For local sockets this option is ignored, and TLS is not used. control-use-cert: "no" # Unbound server key file. # GNUNUX server-key-file: "/etc/unbound/unbound_server.key" # Unbound server certificate file. # GNUNUX server-cert-file: "/etc/unbound/unbound_server.pem" # unbound-control key file. # GNUNUX control-key-file: "/etc/unbound/unbound_control.key" # unbound-control certificate file. # GNUNUX control-cert-file: "/etc/unbound/unbound_control.pem" # Stub and Forward zones include: /etc/unbound/conf.d/*.conf # Stub zones. # Create entries like below, to make all queries for 'example.com' and # 'example.org' go to the given list of nameservers. list zero or more # nameservers by hostname or by ipaddress. If you set stub-prime to yes, # the list is treated as priming hints (default is no). # With stub-first yes, it attempts without the stub if it fails. # Consider adding domain-insecure: name and local-zone: name nodefault # to the server: section if the stub is a locally served zone. # stub-zone: # name: "example.com" # stub-addr: 192.0.2.68 # stub-prime: no # stub-first: no # stub-tcp-upstream: no # stub-tls-upstream: no # stub-no-cache: no # stub-zone: # name: "example.org" # stub-host: ns.example.com. # You can now also dynamically create and delete stub-zone's using # unbound-control stub_add domain.com 1.2.3.4 5.6.7.8 # unbound-control stub_remove domain.com 1.2.3.4 5.6.7.8 # Forward zones # Create entries like below, to make all queries for 'example.com' and # 'example.org' go to the given list of servers. These servers have to handle # recursion to other nameservers. List zero or more nameservers by hostname # or by ipaddress. Use an entry with name "." to forward all queries. # If you enable forward-first, it attempts without the forward if it fails. # forward-zone: # name: "example.com" # forward-addr: 192.0.2.68 # forward-addr: 192.0.2.73@5355 # forward to port 5355. # forward-first: no # forward-tcp-upstream: no # forward-tls-upstream: no # forward-no-cache: no # forward-zone: # name: "example.org" # forward-host: fwd.example.com # # You can now also dynamically create and delete forward-zone's using # unbound-control forward_add domain.com 1.2.3.4 5.6.7.8 # unbound-control forward_remove domain.com 1.2.3.4 5.6.7.8 # Authority zones # The data for these zones is kept locally, from a file or downloaded. # The data can be served to downstream clients, or used instead of the # upstream (which saves a lookup to the upstream). The first example # has a copy of the root for local usage. The second serves example.org # authoritatively. zonefile: reads from file (and writes to it if you also # download it), master: fetches with AXFR and IXFR, or url to zonefile. # With allow-notify: you can give additional (apart from masters) sources of # notifies. auth-zone: name: "." primary: 199.9.14.201 # b.root-servers.net primary: 192.33.4.12 # c.root-servers.net primary: 199.7.91.13 # d.root-servers.net primary: 192.5.5.241 # f.root-servers.net primary: 192.112.36.4 # g.root-servers.net primary: 193.0.14.129 # k.root-servers.net primary: 192.0.47.132 # xfr.cjr.dns.icann.org primary: 192.0.32.132 # xfr.lax.dns.icann.org primary: 2001:500:200::b # b.root-servers.net primary: 2001:500:2::c # c.root-servers.net primary: 2001:500:2d::d # d.root-servers.net primary: 2001:500:2f::f # f.root-servers.net primary: 2001:500:12::d0d # g.root-servers.net primary: 2001:7fd::1 # k.root-servers.net primary: 2620:0:2830:202::132 # xfr.cjr.dns.icann.org primary: 2620:0:2d0:202::132 # xfr.lax.dns.icann.org fallback-enabled: yes for-downstream: no for-upstream: yes # auth-zone: # name: "example.org" # for-downstream: yes # for-upstream: yes # zonemd-check: no # zonemd-reject-absence: no # zonefile: "example.org.zone" # Views # Create named views. Name must be unique. Map views to requests using # the access-control-view option. Views can contain zero or more local-zone # and local-data options. Options from matching views will override global # options. Global options will be used if no matching view is found. # With view-first yes, it will try to answer using the global local-zone and # local-data elements if there is no view specific match. # view: # name: "viewname" # local-zone: "example.com" redirect # local-data: "example.com A 192.0.2.3" # local-data-ptr: "192.0.2.3 www.example.com" # view-first: no # view: # name: "anotherview" # local-zone: "example.com" refuse # Fedora: DNSCrypt support not enabled since it requires linking to # another crypto library # # DNSCrypt # o enable, use --enable-dnscrypt to configure before compiling. # Caveats: # 1. the keys/certs cannot be produced by Unbound. You can use dnscrypt-wrapper # for this: https://github.com/cofyc/dnscrypt-wrapper/blob/master/README.md#usage # 2. dnscrypt channel attaches to an interface. you MUST set interfaces to # listen on `dnscrypt-port` with the follo0wing snippet: # server: # interface: 0.0.0.0@443 # interface: ::0@443 # # Finally, `dnscrypt` config has its own section. # dnscrypt: # dnscrypt-enable: yes # dnscrypt-port: 443 # dnscrypt-provider: 2.dnscrypt-cert.example.com. # dnscrypt-secret-key: /path/unbound-conf/keys1/1.key # dnscrypt-secret-key: /path/unbound-conf/keys2/1.key # dnscrypt-provider-cert: /path/unbound-conf/keys1/1.cert # dnscrypt-provider-cert: /path/unbound-conf/keys2/1.cert # CacheDB # External backend DB as auxiliary cache. # To enable, use --enable-cachedb to configure before compiling. # Specify the backend name # (default is "testframe", which has no use other than for debugging and # testing) and backend-specific options. The 'cachedb' module must be # included in module-config, just before the iterator module. # cachedb: # backend: "testframe" # # secret seed string to calculate hashed keys # secret-seed: "default" # # # For "redis" backend: # # (to enable, use --with-libhiredis to configure before compiling) # # redis server's IP address or host name # redis-server-host: 127.0.0.1 # # redis server's TCP port # redis-server-port: 6379 # # timeout (in ms) for communication with the redis server # redis-timeout: 100 # # set timeout on redis records based on DNS response TTL # redis-expire-records: no # IPSet # Add specify domain into set via ipset. # To enable: # o use --enable-ipset to configure before compiling; # o Unbound then needs to run as root user. # ipset: # # set name for ip v4 addresses # name-v4: "list-v4" # # set name for ip v6 addresses # name-v6: "list-v6" # # Dnstap logging support, if compiled in by using --enable-dnstap to configure. # To enable, set the dnstap-enable to yes and also some of # dnstap-log-..-messages to yes. And select an upstream log destination, by # socket path, TCP or TLS destination. # dnstap: # dnstap-enable: no # # if set to yes frame streams will be used in bidirectional mode # dnstap-bidirectional: yes # dnstap-socket-path: "/etc/unbound/dnstap.sock" # # if "" use the unix socket in dnstap-socket-path, otherwise, # # set it to "IPaddress[@port]" of the destination. # dnstap-ip: "" # # if set to yes if you want to use TLS to dnstap-ip, no for TCP. # dnstap-tls: yes # # name for authenticating the upstream server. or "" disabled. # dnstap-tls-server-name: "" # # if "", it uses the cert bundle from the main Unbound config. # dnstap-tls-cert-bundle: "" # # key file for client authentication, or "" disabled. # dnstap-tls-client-key-file: "" # # cert file for client authentication, or "" disabled. # dnstap-tls-client-cert-file: "" # dnstap-send-identity: no # dnstap-send-version: no # # if "" it uses the hostname. # dnstap-identity: "" # # if "" it uses the package version. # dnstap-version: "" # dnstap-log-resolver-query-messages: no # dnstap-log-resolver-response-messages: no # dnstap-log-client-query-messages: no # dnstap-log-client-response-messages: no # dnstap-log-forwarder-query-messages: no # dnstap-log-forwarder-response-messages: no # Response Policy Zones # RPZ policies. Applied in order of configuration. QNAME, Response IP # Address, nsdname, nsip and clientip triggers are supported. Supported # actions are: NXDOMAIN, NODATA, PASSTHRU, DROP, Local Data, tcp-only # and drop. Policies can be loaded from a file, or using zone # transfer, or using HTTP. The respip module needs to be added # to the module-config, e.g.: module-config: "respip validator iterator". # rpz: # name: "rpz.example.com" # zonefile: "rpz.example.com" # primary: 192.0.2.0 # allow-notify: 192.0.2.0/32 # url: http://www.example.com/rpz.example.org.zone # rpz-action-override: cname # rpz-cname-override: www.example.org # rpz-log: yes # rpz-log-name: "example policy" # rpz-signal-nxdomain-ra: no # for-downstream: no # tags: "example"