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diff --git a/external/unbound/doc/unbound.conf.5.in b/external/unbound/doc/unbound.conf.5.in new file mode 100644 index 000000000..11c77fdfe --- /dev/null +++ b/external/unbound/doc/unbound.conf.5.in @@ -0,0 +1,1141 @@ +.TH "unbound.conf" "5" "@date@" "NLnet Labs" "unbound @version@" +.\" +.\" unbound.conf.5 -- unbound.conf manual +.\" +.\" Copyright (c) 2007, NLnet Labs. All rights reserved. +.\" +.\" See LICENSE for the license. +.\" +.\" +.SH "NAME" +.B unbound.conf +\- Unbound configuration file. +.SH "SYNOPSIS" +.B unbound.conf +.SH "DESCRIPTION" +.B unbound.conf +is used to configure +\fIunbound\fR(8). +The file format has attributes and values. Some attributes have attributes inside them. +The notation is: attribute: value. +.P +Comments start with # and last to the end of line. Empty lines are +ignored as is whitespace at the beginning of a line. +.P +The utility +\fIunbound\-checkconf\fR(8) +can be used to check unbound.conf prior to usage. +.SH "EXAMPLE" +An example config file is shown below. Copy this to /etc/unbound/unbound.conf +and start the server with: +.P +.nf + $ unbound \-c /etc/unbound/unbound.conf +.fi +.P +Most settings are the defaults. Stop the server with: +.P +.nf + $ kill `cat /etc/unbound/unbound.pid` +.fi +.P +Below is a minimal config file. The source distribution contains an extensive +example.conf file with all the options. +.P +.nf +# unbound.conf(5) config file for unbound(8). +server: + directory: "/etc/unbound" + username: unbound + # make sure unbound can access entropy from inside the chroot. + # e.g. on linux the use these commands (on BSD, devfs(8) is used): + # mount \-\-bind \-n /dev/random /etc/unbound/dev/random + # and mount \-\-bind \-n /dev/log /etc/unbound/dev/log + chroot: "/etc/unbound" + # logfile: "/etc/unbound/unbound.log" #uncomment to use logfile. + pidfile: "/etc/unbound/unbound.pid" + # verbosity: 1 # uncomment and increase to get more logging. + # listen on all interfaces, answer queries from the local subnet. + interface: 0.0.0.0 + interface: ::0 + access\-control: 10.0.0.0/8 allow + access\-control: 2001:DB8::/64 allow +.fi +.SH "FILE FORMAT" +There must be whitespace between keywords. Attribute keywords end with a colon ':'. An attribute +is followed by its containing attributes, or a value. +.P +Files can be included using the +.B include: +directive. It can appear anywhere, it accepts a single file name as argument. +Processing continues as if the text from the included file was copied into +the config file at that point. If also using chroot, using full path names +for the included files works, relative pathnames for the included names work +if the directory where the daemon is started equals its chroot/working +directory. Wildcards can be used to include multiple files, see \fIglob\fR(7). +.SS "Server Options" +These options are part of the +.B server: +clause. +.TP +.B verbosity: \fI<number> +The verbosity number, level 0 means no verbosity, only errors. Level 1 +gives operational information. Level 2 gives detailed operational +information. Level 3 gives query level information, output per query. +Level 4 gives algorithm level information. Level 5 logs client +identification for cache misses. Default is level 1. +The verbosity can also be increased from the commandline, see \fIunbound\fR(8). +.TP +.B statistics\-interval: \fI<seconds> +The number of seconds between printing statistics to the log for every thread. +Disable with value 0 or "". Default is disabled. The histogram statistics +are only printed if replies were sent during the statistics interval, +requestlist statistics are printed for every interval (but can be 0). +This is because the median calculation requires data to be present. +.TP +.B statistics\-cumulative: \fI<yes or no> +If enabled, statistics are cumulative since starting unbound, without clearing +the statistics counters after logging the statistics. Default is no. +.TP +.B extended\-statistics: \fI<yes or no> +If enabled, extended statistics are printed from \fIunbound\-control\fR(8). +Default is off, because keeping track of more statistics takes time. The +counters are listed in \fIunbound\-control\fR(8). +.TP +.B num\-threads: \fI<number> +The number of threads to create to serve clients. Use 1 for no threading. +.TP +.B port: \fI<port number> +The port number, default 53, on which the server responds to queries. +.TP +.B interface: \fI<ip address[@port]> +Interface to use to connect to the network. This interface is listened to +for queries from clients, and answers to clients are given from it. +Can be given multiple times to work on several interfaces. If none are +given the default is to listen to localhost. +The interfaces are not changed on a reload (kill \-HUP) but only on restart. +A port number can be specified with @port (without spaces between +interface and port number), if not specified the default port (from +\fBport\fR) is used. +.TP +.B ip\-address: \fI<ip address[@port]> +Same as interface: (for easy of compatibility with nsd.conf). +.TP +.B interface\-automatic: \fI<yes or no> +Detect source interface on UDP queries and copy them to replies. This +feature is experimental, and needs support in your OS for particular socket +options. Default value is no. +.TP +.B outgoing\-interface: \fI<ip address> +Interface to use to connect to the network. This interface is used to send +queries to authoritative servers and receive their replies. Can be given +multiple times to work on several interfaces. If none are given the +default (all) is used. You can specify the same interfaces in +.B interface: +and +.B outgoing\-interface: +lines, the interfaces are then used for both purposes. Outgoing queries are +sent via a random outgoing interface to counter spoofing. +.TP +.B outgoing\-range: \fI<number> +Number of ports to open. This number of file descriptors can be opened per +thread. Must be at least 1. Default depends on compile options. Larger +numbers need extra resources from the operating system. For performance a +a very large value is best, use libevent to make this possible. +.TP +.B outgoing\-port\-permit: \fI<port number or range> +Permit unbound to open this port or range of ports for use to send queries. +A larger number of permitted outgoing ports increases resilience against +spoofing attempts. Make sure these ports are not needed by other daemons. +By default only ports above 1024 that have not been assigned by IANA are used. +Give a port number or a range of the form "low\-high", without spaces. +.IP +The \fBoutgoing\-port\-permit\fR and \fBoutgoing\-port\-avoid\fR statements +are processed in the line order of the config file, adding the permitted ports +and subtracting the avoided ports from the set of allowed ports. The +processing starts with the non IANA allocated ports above 1024 in the set +of allowed ports. +.TP +.B outgoing\-port\-avoid: \fI<port number or range> +Do not permit unbound to open this port or range of ports for use to send +queries. Use this to make sure unbound does not grab a port that another +daemon needs. The port is avoided on all outgoing interfaces, both IP4 and IP6. +By default only ports above 1024 that have not been assigned by IANA are used. +Give a port number or a range of the form "low\-high", without spaces. +.TP +.B outgoing\-num\-tcp: \fI<number> +Number of outgoing TCP buffers to allocate per thread. Default is 10. If set +to 0, or if do\-tcp is "no", no TCP queries to authoritative servers are done. +.TP +.B incoming\-num\-tcp: \fI<number> +Number of incoming TCP buffers to allocate per thread. Default is 10. If set +to 0, or if do\-tcp is "no", no TCP queries from clients are accepted. +.TP +.B edns\-buffer\-size: \fI<number> +Number of bytes size to advertise as the EDNS reassembly buffer size. +This is the value put into datagrams over UDP towards peers. The actual +buffer size is determined by msg\-buffer\-size (both for TCP and UDP). Do +not set higher than that value. Default is 4096 which is RFC recommended. +If you have fragmentation reassembly problems, usually seen as timeouts, +then a value of 1480 can fix it. Setting to 512 bypasses even the most +stringent path MTU problems, but is seen as extreme, since the amount +of TCP fallback generated is excessive (probably also for this resolver, +consider tuning the outgoing tcp number). +.TP +.B max\-udp\-size: \fI<number> +Maximum UDP response size (not applied to TCP response). 65536 disables the +udp response size maximum, and uses the choice from the client, always. +Suggested values are 512 to 4096. Default is 4096. +.TP +.B msg\-buffer\-size: \fI<number> +Number of bytes size of the message buffers. Default is 65552 bytes, enough +for 64 Kb packets, the maximum DNS message size. No message larger than this +can be sent or received. Can be reduced to use less memory, but some requests +for DNS data, such as for huge resource records, will result in a SERVFAIL +reply to the client. +.TP +.B msg\-cache\-size: \fI<number> +Number of bytes size of the message cache. Default is 4 megabytes. +A plain number is in bytes, append 'k', 'm' or 'g' for kilobytes, megabytes +or gigabytes (1024*1024 bytes in a megabyte). +.TP +.B msg\-cache\-slabs: \fI<number> +Number of slabs in the message cache. Slabs reduce lock contention by threads. +Must be set to a power of 2. Setting (close) to the number of cpus is a +reasonable guess. +.TP +.B num\-queries\-per\-thread: \fI<number> +The number of queries that every thread will service simultaneously. +If more queries arrive that need servicing, and no queries can be jostled out +(see \fIjostle\-timeout\fR), then the queries are dropped. This forces +the client to resend after a timeout; allowing the server time to work on +the existing queries. Default depends on compile options, 512 or 1024. +.TP +.B jostle\-timeout: \fI<msec> +Timeout used when the server is very busy. Set to a value that usually +results in one roundtrip to the authority servers. If too many queries +arrive, then 50% of the queries are allowed to run to completion, and +the other 50% are replaced with the new incoming query if they have already +spent more than their allowed time. This protects against denial of +service by slow queries or high query rates. Default 200 milliseconds. +The effect is that the qps for long-lasting queries is about +(numqueriesperthread / 2) / (average time for such long queries) qps. +The qps for short queries can be about (numqueriesperthread / 2) +/ (jostletimeout in whole seconds) qps per thread, about (1024/2)*5 = 2560 +qps by default. +.TP +.B delay\-close: \fI<msec> +Extra delay for timeouted UDP ports before they are closed, in msec. +Default is 0, and that disables it. This prevents very delayed answer +packets from the upstream (recursive) servers from bouncing against +closed ports and setting off all sort of close-port counters, with +eg. 1500 msec. When timeouts happen you need extra sockets, it checks +the ID and remote IP of packets, and unwanted packets are added to the +unwanted packet counter. +.TP +.B so\-rcvbuf: \fI<number> +If not 0, then set the SO_RCVBUF socket option to get more buffer +space on UDP port 53 incoming queries. So that short spikes on busy +servers do not drop packets (see counter in netstat \-su). Default is +0 (use system value). Otherwise, the number of bytes to ask for, try +"4m" on a busy server. The OS caps it at a maximum, on linux unbound +needs root permission to bypass the limit, or the admin can use sysctl +net.core.rmem_max. On BSD change kern.ipc.maxsockbuf in /etc/sysctl.conf. +On OpenBSD change header and recompile kernel. On Solaris ndd \-set +/dev/udp udp_max_buf 8388608. +.TP +.B so\-sndbuf: \fI<number> +If not 0, then set the SO_SNDBUF socket option to get more buffer space on +UDP port 53 outgoing queries. This for very busy servers handles spikes +in answer traffic, otherwise 'send: resource temporarily unavailable' +can get logged, the buffer overrun is also visible by netstat \-su. +Default is 0 (use system value). Specify the number of bytes to ask +for, try "4m" on a very busy server. The OS caps it at a maximum, on +linux unbound needs root permission to bypass the limit, or the admin +can use sysctl net.core.wmem_max. On BSD, Solaris changes are similar +to so\-rcvbuf. +.TP +.B so\-reuseport: \fI<yes or no> +If yes, then open dedicated listening sockets for incoming queries for each +thread and try to set the SO_REUSEPORT socket option on each socket. May +distribute incoming queries to threads more evenly. Default is no. On Linux +it is supported in kernels >= 3.9. On other systems, FreeBSD, OSX it may +also work. You can enable it (on any platform and kernel), +it then attempts to open the port and passes the option if it was available +at compile time, if that works it is used, if it fails, it continues +silently (unless verbosity 3) without the option. +.TP +.B rrset\-cache\-size: \fI<number> +Number of bytes size of the RRset cache. Default is 4 megabytes. +A plain number is in bytes, append 'k', 'm' or 'g' for kilobytes, megabytes +or gigabytes (1024*1024 bytes in a megabyte). +.TP +.B rrset\-cache\-slabs: \fI<number> +Number of slabs in the RRset cache. Slabs reduce lock contention by threads. +Must be set to a power of 2. +.TP +.B cache\-max\-ttl: \fI<seconds> +Time to live maximum for RRsets and messages in the cache. Default is +86400 seconds (1 day). If the maximum kicks in, responses to clients +still get decrementing TTLs based on the original (larger) values. +When the internal TTL expires, the cache item has expired. +Can be set lower to force the resolver to query for data often, and not +trust (very large) TTL values. +.TP +.B cache\-min\-ttl: \fI<seconds> +Time to live minimum for RRsets and messages in the cache. Default is 0. +If the the minimum kicks in, the data is cached for longer than the domain +owner intended, and thus less queries are made to look up the data. +Zero makes sure the data in the cache is as the domain owner intended, +higher values, especially more than an hour or so, can lead to trouble as +the data in the cache does not match up with the actual data any more. +.TP +.B infra\-host\-ttl: \fI<seconds> +Time to live for entries in the host cache. The host cache contains +roundtrip timing, lameness and EDNS support information. Default is 900. +.TP +.B infra\-cache\-slabs: \fI<number> +Number of slabs in the infrastructure cache. Slabs reduce lock contention +by threads. Must be set to a power of 2. +.TP +.B infra\-cache\-numhosts: \fI<number> +Number of hosts for which information is cached. Default is 10000. +.TP +.B do\-ip4: \fI<yes or no> +Enable or disable whether ip4 queries are answered or issued. Default is yes. +.TP +.B do\-ip6: \fI<yes or no> +Enable or disable whether ip6 queries are answered or issued. Default is yes. +If disabled, queries are not answered on IPv6, and queries are not sent on +IPv6 to the internet nameservers. With this option you can disable the +ipv6 transport for sending DNS traffic, it does not impact the contents of +the DNS traffic, which may have ip4 and ip6 addresses in it. +.TP +.B do\-udp: \fI<yes or no> +Enable or disable whether UDP queries are answered or issued. Default is yes. +.TP +.B do\-tcp: \fI<yes or no> +Enable or disable whether TCP queries are answered or issued. Default is yes. +.TP +.B tcp\-upstream: \fI<yes or no> +Enable or disable whether the upstream queries use TCP only for transport. +Default is no. Useful in tunneling scenarios. +.TP +.B ssl\-upstream: \fI<yes or no> +Enabled or disable whether the upstream queries use SSL only for transport. +Default is no. Useful in tunneling scenarios. The SSL contains plain DNS in +TCP wireformat. The other server must support this (see \fBssl\-service\-key\fR). +.TP +.B ssl\-service-key: \fI<file> +If enabled, the server provider SSL service on its TCP sockets. The clients +have to use ssl\-upstream: yes. The file is the private key for the TLS +session. The public certificate is in the ssl\-service\-pem file. Default +is "", turned off. Requires a restart (a reload is not enough) if changed, +because the private key is read while root permissions are held and before +chroot (if any). Normal DNS TCP service is not provided and gives errors, +this service is best run with a different \fBport:\fR config or \fI@port\fR +suffixes in the \fBinterface\fR config. +.TP +.B ssl\-service\-pem: \fI<file> +The public key certificate pem file for the ssl service. Default is "", +turned off. +.TP +.B ssl\-port: \fI<number> +The port number on which to provide TCP SSL service, default 443, only +interfaces configured with that port number as @number get the SSL service. +.TP +.B do\-daemonize: \fI<yes or no> +Enable or disable whether the unbound server forks into the background as +a daemon. Default is yes. +.TP +.B access\-control: \fI<IP netblock> <action> +The netblock is given as an IP4 or IP6 address with /size appended for a +classless network block. The action can be \fIdeny\fR, \fIrefuse\fR, +\fIallow\fR, \fIallow_snoop\fR, \fIdeny_non_local\fR or \fIrefuse_non_local\fR. +.IP +The action \fIdeny\fR stops queries from hosts from that netblock. +.IP +The action \fIrefuse\fR stops queries too, but sends a DNS rcode REFUSED +error message back. +.IP +The action \fIallow\fR gives access to clients from that netblock. +It gives only access for recursion clients (which is +what almost all clients need). Nonrecursive queries are refused. +.IP +The \fIallow\fR action does allow nonrecursive queries to access the +local\-data that is configured. The reason is that this does not involve +the unbound server recursive lookup algorithm, and static data is served +in the reply. This supports normal operations where nonrecursive queries +are made for the authoritative data. For nonrecursive queries any replies +from the dynamic cache are refused. +.IP +The action \fIallow_snoop\fR gives nonrecursive access too. This give +both recursive and non recursive access. The name \fIallow_snoop\fR refers +to cache snooping, a technique to use nonrecursive queries to examine +the cache contents (for malicious acts). However, nonrecursive queries can +also be a valuable debugging tool (when you want to examine the cache +contents). In that case use \fIallow_snoop\fR for your administration host. +.IP +By default only localhost is \fIallow\fRed, the rest is \fIrefuse\fRd. +The default is \fIrefuse\fRd, because that is protocol\-friendly. The DNS +protocol is not designed to handle dropped packets due to policy, and +dropping may result in (possibly excessive) retried queries. +.IP +The deny_non_local and refuse_non_local settings are for hosts that are +only allowed to query for the authoritative local\-data, they are not +allowed full recursion but only the static data. With deny_non_local, +messages that are disallowed are dropped, with refuse_non_local they +receive error code REFUSED. +.TP +.B chroot: \fI<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. +.IP +All other file paths (working dir, logfile, roothints, and +key files) can be specified in several ways: +as an absolute path relative to the new root, +as a relative path to the working directory, or +as an absolute path relative to the original root. +In the last case the path is adjusted to remove the unused portion. +.IP +The pidfile can be either a relative path to the working directory, or +an absolute path relative to the original root. It is written just prior +to chroot and dropping permissions. This allows the pidfile to be +/var/run/unbound.pid and the chroot to be /var/unbound, for example. +.IP +Additionally, unbound may need to access /dev/random (for entropy) +from inside the chroot. +.IP +If given a chroot is done to the given directory. The default is +"@UNBOUND_CHROOT_DIR@". If you give "" no chroot is performed. +.TP +.B username: \fI<name> +If given, after binding the port the user privileges are dropped. Default is +"@UNBOUND_USERNAME@". If you give username: "" no user change is performed. +.IP +If this user is not capable of binding the +port, reloads (by signal HUP) will still retain the opened ports. +If you change the port number in the config file, and that new port number +requires privileges, then a reload will fail; a restart is needed. +.TP +.B directory: \fI<directory> +Sets the working directory for the program. Default is "@UNBOUND_RUN_DIR@". +.TP +.B logfile: \fI<filename> +If "" is given, logging goes to stderr, or nowhere once daemonized. +The logfile is appended to, in the following format: +.nf +[seconds since 1970] unbound[pid:tid]: type: message. +.fi +If this option is given, the use\-syslog is option is set to "no". +The logfile is reopened (for append) when the config file is reread, on +SIGHUP. +.TP +.B use\-syslog: \fI<yes or no> +Sets unbound to send log messages to the syslogd, using +\fIsyslog\fR(3). +The log facility LOG_DAEMON is used, with identity "unbound". +The logfile setting is overridden when use\-syslog is turned on. +The default is to log to syslog. +.TP +.B log\-time\-ascii: \fI<yes or no> +Sets logfile lines to use a timestamp in UTC ascii. Default is no, which +prints the seconds since 1970 in brackets. No effect if using syslog, in +that case syslog formats the timestamp printed into the log files. +.TP +.B log\-queries: \fI<yes or no> +Prints one line per query to the log, with the log timestamp and IP address, +name, type and class. Default is no. Note that it takes time to print these +lines which makes the server (significantly) slower. Odd (nonprintable) +characters in names are printed as '?'. +.TP +.B pidfile: \fI<filename> +The process id is written to the file. Default is "@UNBOUND_PIDFILE@". +So, +.nf +kill \-HUP `cat @UNBOUND_PIDFILE@` +.fi +triggers a reload, +.nf +kill \-QUIT `cat @UNBOUND_PIDFILE@` +.fi +gracefully terminates. +.TP +.B root\-hints: \fI<filename> +Read the root hints from this file. Default is nothing, using builtin hints +for the IN class. The file has the format of zone files, with root +nameserver names and addresses only. The default may become outdated, +when servers change, therefore it is good practice to use a root\-hints file. +.TP +.B hide\-identity: \fI<yes or no> +If enabled id.server and hostname.bind queries are refused. +.TP +.B identity: \fI<string> +Set the identity to report. If set to "", the default, then the hostname +of the server is returned. +.TP +.B hide\-version: \fI<yes or no> +If enabled version.server and version.bind queries are refused. +.TP +.B version: \fI<string> +Set the version to report. If set to "", the default, then the package +version is returned. +.TP +.B target\-fetch\-policy: \fI<"list of numbers"> +Set the target fetch policy used by unbound to determine if it should fetch +nameserver target addresses opportunistically. The policy is described per +dependency depth. +.IP +The number of values determines the maximum dependency depth +that unbound will pursue in answering a query. +A value of \-1 means to fetch all targets opportunistically for that dependency +depth. A value of 0 means to fetch on demand only. A positive value fetches +that many targets opportunistically. +.IP +Enclose the list between quotes ("") and put spaces between numbers. +The default is "3 2 1 0 0". Setting all zeroes, "0 0 0 0 0" gives behaviour +closer to that of BIND 9, while setting "\-1 \-1 \-1 \-1 \-1" gives behaviour +rumoured to be closer to that of BIND 8. +.TP +.B harden\-short\-bufsize: \fI<yes or no> +Very small EDNS buffer sizes from queries are ignored. Default is off, since +it is legal protocol wise to send these, and unbound tries to give very +small answers to these queries, where possible. +.TP +.B harden\-large\-queries: \fI<yes or no> +Very large queries are ignored. Default is off, since it is legal protocol +wise to send these, and could be necessary for operation if TSIG or EDNS +payload is very large. +.TP +.B harden\-glue: \fI<yes or no> +Will trust glue only if it is within the servers authority. Default is on. +.TP +.B harden\-dnssec\-stripped: \fI<yes or no> +Require DNSSEC data for trust\-anchored zones, if such data is absent, +the zone becomes bogus. If turned off, and no DNSSEC data is received +(or the DNSKEY data fails to validate), then the zone is made insecure, +this behaves like there is no trust anchor. You could turn this off if +you are sometimes behind an intrusive firewall (of some sort) that +removes DNSSEC data from packets, or a zone changes from signed to +unsigned to badly signed often. If turned off you run the risk of a +downgrade attack that disables security for a zone. Default is on. +.TP +.B harden\-below\-nxdomain: \fI<yes or no> +From draft\-vixie\-dnsext\-resimprove, returns nxdomain to queries for a name +below another name that is already known to be nxdomain. DNSSEC mandates +noerror for empty nonterminals, hence this is possible. Very old software +might return nxdomain for empty nonterminals (that usually happen for reverse +IP address lookups), and thus may be incompatible with this. To try to avoid +this only DNSSEC-secure nxdomains are used, because the old software does not +have DNSSEC. Default is off. +.TP +.B harden\-referral\-path: \fI<yes or no> +Harden the referral path by performing additional queries for +infrastructure data. Validates the replies if trust anchors are configured +and the zones are signed. This enforces DNSSEC validation on nameserver +NS sets and the nameserver addresses that are encountered on the referral +path to the answer. +Default off, because it burdens the authority servers, and it is +not RFC standard, and could lead to performance problems because of the +extra query load that is generated. Experimental option. +If you enable it consider adding more numbers after the target\-fetch\-policy +to increase the max depth that is checked to. +.TP +.B use\-caps\-for\-id: \fI<yes or no> +Use 0x20\-encoded random bits in the query to foil spoof attempts. +This perturbs the lowercase and uppercase of query names sent to +authority servers and checks if the reply still has the correct casing. +Disabled by default. +This feature is an experimental implementation of draft dns\-0x20. +.TP +.B private\-address: \fI<IP address or subnet> +Give IPv4 of IPv6 addresses or classless subnets. These are addresses +on your private network, and are not allowed to be returned for public +internet names. Any occurence of such addresses are removed from +DNS answers. Additionally, the DNSSEC validator may mark the answers +bogus. This protects against so\-called DNS Rebinding, where a user browser +is turned into a network proxy, allowing remote access through the browser +to other parts of your private network. Some names can be allowed to +contain your private addresses, by default all the \fBlocal\-data\fR +that you configured is allowed to, and you can specify additional +names using \fBprivate\-domain\fR. No private addresses are enabled +by default. We consider to enable this for the RFC1918 private IP +address space by default in later releases. That would enable private +addresses for 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 169.254.0.0/16 +fd00::/8 and fe80::/10, since the RFC standards say these addresses +should not be visible on the public internet. Turning on 127.0.0.0/8 +would hinder many spamblocklists as they use that. +.TP +.B private\-domain: \fI<domain name> +Allow this domain, and all its subdomains to contain private addresses. +Give multiple times to allow multiple domain names to contain private +addresses. Default is none. +.TP +.B unwanted\-reply\-threshold: \fI<number> +If set, a total number of unwanted replies is kept track of in every thread. +When it reaches the threshold, a defensive action is taken and a warning +is printed to the log. The defensive action is to clear the rrset and +message caches, hopefully flushing away any poison. A value of 10 million +is suggested. Default is 0 (turned off). +.TP +.B do\-not\-query\-address: \fI<IP address> +Do not query the given IP address. Can be IP4 or IP6. Append /num to +indicate a classless delegation netblock, for example like +10.2.3.4/24 or 2001::11/64. +.TP +.B do\-not\-query\-localhost: \fI<yes or no> +If yes, localhost is added to the do\-not\-query\-address entries, both +IP6 ::1 and IP4 127.0.0.1/8. If no, then localhost can be used to send +queries to. Default is yes. +.TP +.B prefetch: \fI<yes or no> +If yes, message cache elements are prefetched before they expire to +keep the cache up to date. Default is no. Turning it on gives about +10 percent more traffic and load on the machine, but popular items do +not expire from the cache. +.TP +.B prefetch-key: \fI<yes or no> +If yes, fetch the DNSKEYs earlier in the validation process, when a DS +record is encountered. This lowers the latency of requests. It does use +a little more CPU. Also if the cache is set to 0, it is no use. Default is no. +.TP +.B rrset-roundrobin: \fI<yes or no> +If yes, Unbound rotates RRSet order in response (the random number is taken +from the query ID, for speed and thread safety). Default is no. +.TP +.B minimal-responses: \fI<yes or no> +If yes, Unbound doesn't insert authority/additional sections into response +messages when those sections are not required. This reduces response +size significantly, and may avoid TCP fallback for some responses. +This may cause a slight speedup. The default is no, because the DNS +protocol RFCs mandate these sections, and the additional content could +be of use and save roundtrips for clients. +.TP +.B module\-config: \fI<"module names"> +Module configuration, a list of module names separated by spaces, surround +the string with quotes (""). The modules can be validator, iterator. +Setting this to "iterator" will result in a non\-validating server. +Setting this to "validator iterator" will turn on DNSSEC validation. +The ordering of the modules is important. +You must also set trust\-anchors for validation to be useful. +.TP +.B trust\-anchor\-file: \fI<filename> +File with trusted keys for validation. Both DS and DNSKEY entries can appear +in the file. The format of the file is the standard DNS Zone file format. +Default is "", or no trust anchor file. +.TP +.B auto\-trust\-anchor\-file: \fI<filename> +File with trust anchor for one zone, which is tracked with RFC5011 probes. +The probes are several times per month, thus the machine must be online +frequently. The initial file can be one with contents as described in +\fBtrust\-anchor\-file\fR. The file is written to when the anchor is updated, +so the unbound user must have write permission. +.TP +.B trust\-anchor: \fI<"Resource Record"> +A DS or DNSKEY RR for a key to use for validation. Multiple entries can be +given to specify multiple trusted keys, in addition to the trust\-anchor\-files. +The resource record is entered in the same format as 'dig' or 'drill' prints +them, the same format as in the zone file. Has to be on a single line, with +"" around it. A TTL can be specified for ease of cut and paste, but is ignored. +A class can be specified, but class IN is default. +.TP +.B trusted\-keys\-file: \fI<filename> +File with trusted keys for validation. Specify more than one file +with several entries, one file per entry. Like \fBtrust\-anchor\-file\fR +but has a different file format. Format is BIND\-9 style format, +the trusted\-keys { name flag proto algo "key"; }; clauses are read. +It is possible to use wildcards with this statement, the wildcard is +expanded on start and on reload. +.TP +.B dlv\-anchor\-file: \fI<filename> +File with trusted keys for DLV (DNSSEC Lookaside Validation). Both DS and +DNSKEY entries can be used in the file, in the same format as for +\fItrust\-anchor\-file:\fR statements. Only one DLV can be configured, more +would be slow. The DLV configured is used as a root trusted DLV, this +means that it is a lookaside for the root. Default is "", or no dlv anchor file. +.TP +.B dlv\-anchor: \fI<"Resource Record"> +Much like trust\-anchor, this is a DLV anchor with the DS or DNSKEY inline. +.TP +.B domain\-insecure: \fI<domain name> +Sets domain name to be insecure, DNSSEC chain of trust is ignored towards +the domain name. So a trust anchor above the domain name can not make the +domain secure with a DS record, such a DS record is then ignored. +Also keys from DLV are ignored for the domain. Can be given multiple times +to specify multiple domains that are treated as if unsigned. If you set +trust anchors for the domain they override this setting (and the domain +is secured). +.IP +This can be useful if you want to make sure a trust anchor for external +lookups does not affect an (unsigned) internal domain. A DS record +externally can create validation failures for that internal domain. +.TP +.B val\-override\-date: \fI<rrsig\-style date spec> +Default is "" or "0", which disables this debugging feature. If enabled by +giving a RRSIG style date, that date is used for verifying RRSIG inception +and expiration dates, instead of the current date. Do not set this unless +you are debugging signature inception and expiration. The value \-1 ignores +the date altogether, useful for some special applications. +.TP +.B val\-sig\-skew\-min: \fI<seconds> +Minimum number of seconds of clock skew to apply to validated signatures. +A value of 10% of the signature lifetime (expiration \- inception) is +used, capped by this setting. Default is 3600 (1 hour) which allows for +daylight savings differences. Lower this value for more strict checking +of short lived signatures. +.TP +.B val\-sig\-skew\-max: \fI<seconds> +Maximum number of seconds of clock skew to apply to validated signatures. +A value of 10% of the signature lifetime (expiration \- inception) +is used, capped by this setting. Default is 86400 (24 hours) which +allows for timezone setting problems in stable domains. Setting both +min and max very low disables the clock skew allowances. Setting both +min and max very high makes the validator check the signature timestamps +less strictly. +.TP +.B val\-bogus\-ttl: \fI<number> +The time to live for bogus data. This is data that has failed validation; +due to invalid signatures or other checks. The TTL from that data cannot be +trusted, and this value is used instead. The value is in seconds, default 60. +The time interval prevents repeated revalidation of bogus data. +.TP +.B val\-clean\-additional: \fI<yes or no> +Instruct the validator to remove data from the additional section of secure +messages that are not signed properly. Messages that are insecure, bogus, +indeterminate or unchecked are not affected. Default is yes. Use this setting +to protect the users that rely on this validator for authentication from +protentially bad data in the additional section. +.TP +.B val\-log\-level: \fI<number> +Have the validator print validation failures to the log. Regardless of +the verbosity setting. Default is 0, off. At 1, for every user query +that fails a line is printed to the logs. This way you can monitor what +happens with validation. Use a diagnosis tool, such as dig or drill, +to find out why validation is failing for these queries. At 2, not only +the query that failed is printed but also the reason why unbound thought +it was wrong and which server sent the faulty data. +.TP +.B val\-permissive\-mode: \fI<yes or no> +Instruct the validator to mark bogus messages as indeterminate. The security +checks are performed, but if the result is bogus (failed security), the +reply is not withheld from the client with SERVFAIL as usual. The client +receives the bogus data. For messages that are found to be secure the AD bit +is set in replies. Also logging is performed as for full validation. +The default value is "no". +.TP +.B ignore\-cd\-flag: \fI<yes or no> +Instruct unbound to ignore the CD flag from clients and refuse to +return bogus answers to them. Thus, the CD (Checking Disabled) flag +does not disable checking any more. This is useful if legacy (w2008) +servers that set the CD flag but cannot validate DNSSEC themselves are +the clients, and then unbound provides them with DNSSEC protection. +The default value is "no". +.TP +.B val\-nsec3\-keysize\-iterations: \fI<"list of values"> +List of keysize and iteration count values, separated by spaces, surrounded +by quotes. Default is "1024 150 2048 500 4096 2500". This determines the +maximum allowed NSEC3 iteration count before a message is simply marked +insecure instead of performing the many hashing iterations. The list must +be in ascending order and have at least one entry. If you set it to +"1024 65535" there is no restriction to NSEC3 iteration values. +This table must be kept short; a very long list could cause slower operation. +.TP +.B add\-holddown: \fI<seconds> +Instruct the \fBauto\-trust\-anchor\-file\fR probe mechanism for RFC5011 +autotrust updates to add new trust anchors only after they have been +visible for this time. Default is 30 days as per the RFC. +.TP +.B del\-holddown: \fI<seconds> +Instruct the \fBauto\-trust\-anchor\-file\fR probe mechanism for RFC5011 +autotrust updates to remove revoked trust anchors after they have been +kept in the revoked list for this long. Default is 30 days as per +the RFC. +.TP +.B keep\-missing: \fI<seconds> +Instruct the \fBauto\-trust\-anchor\-file\fR probe mechanism for RFC5011 +autotrust updates to remove missing trust anchors after they have been +unseen for this long. This cleans up the state file if the target zone +does not perform trust anchor revocation, so this makes the auto probe +mechanism work with zones that perform regular (non\-5011) rollovers. +The default is 366 days. The value 0 does not remove missing anchors, +as per the RFC. +.TP +.B key\-cache\-size: \fI<number> +Number of bytes size of the key cache. Default is 4 megabytes. +A plain number is in bytes, append 'k', 'm' or 'g' for kilobytes, megabytes +or gigabytes (1024*1024 bytes in a megabyte). +.TP +.B key\-cache\-slabs: \fI<number> +Number of slabs in the key cache. Slabs reduce lock contention by threads. +Must be set to a power of 2. Setting (close) to the number of cpus is a +reasonable guess. +.TP +.B neg\-cache\-size: \fI<number> +Number of bytes size of the aggressive negative cache. Default is 1 megabyte. +A plain number is in bytes, append 'k', 'm' or 'g' for kilobytes, megabytes +or gigabytes (1024*1024 bytes in a megabyte). +.TP +.B unblock\-lan\-zones: \fI<yesno> +Default is disabled. If enabled, then for private address space, +the reverse lookups are no longer filtered. This allows unbound when +running as dns service on a host where it provides service for that host, +to put out all of the queries for the 'lan' upstream. When enabled, +only localhost, 127.0.0.1 reverse and ::1 reverse zones are configured +with default local zones. Disable the option when unbound is running +as a (DHCP-) DNS network resolver for a group of machines, where such +lookups should be filtered (RFC compliance), this also stops potential +data leakage about the local network to the upstream DNS servers. +.TP +.B local\-zone: \fI<zone> <type> +Configure a local zone. The type determines the answer to give if +there is no match from local\-data. The types are deny, refuse, static, +transparent, redirect, nodefault, typetransparent, and are explained +below. After that the default settings are listed. Use local\-data: to +enter data into the local zone. Answers for local zones are authoritative +DNS answers. By default the zones are class IN. +.IP +If you need more complicated authoritative data, with referrals, wildcards, +CNAME/DNAME support, or DNSSEC authoritative service, setup a stub\-zone for +it as detailed in the stub zone section below. +.TP 10 +\h'5'\fIdeny\fR +Do not send an answer, drop the query. +If there is a match from local data, the query is answered. +.TP 10 +\h'5'\fIrefuse\fR +Send an error message reply, with rcode REFUSED. +If there is a match from local data, the query is answered. +.TP 10 +\h'5'\fIstatic\fR +If there is a match from local data, the query is answered. +Otherwise, the query is answered with nodata or nxdomain. +For a negative answer a SOA is included in the answer if present +as local\-data for the zone apex domain. +.TP 10 +\h'5'\fItransparent\fR +If there is a match from local data, the query is answered. +Otherwise if the query has a different name, the query is resolved normally. +If the query is for a name given in localdata but no such type of data is +given in localdata, then a noerror nodata answer is returned. +If no local\-zone is given local\-data causes a transparent zone +to be created by default. +.TP 10 +\h'5'\fItypetransparent\fR +If there is a match from local data, the query is answered. If the query +is for a different name, or for the same name but for a different type, +the query is resolved normally. So, similar to transparent but types +that are not listed in local data are resolved normally, so if an A record +is in the local data that does not cause a nodata reply for AAAA queries. +.TP 10 +\h'5'\fIredirect\fR +The query is answered from the local data for the zone name. +There may be no local data beneath the zone name. +This answers queries for the zone, and all subdomains of the zone +with the local data for the zone. +It can be used to redirect a domain to return a different address record +to the end user, with +local\-zone: "example.com." redirect and +local\-data: "example.com. A 127.0.0.1" +queries for www.example.com and www.foo.example.com are redirected, so +that users with web browsers cannot access sites with suffix example.com. +.TP 10 +\h'5'\fInodefault\fR +Used to turn off default contents for AS112 zones. The other types +also turn off default contents for the zone. The 'nodefault' option +has no other effect than turning off default contents for the +given zone. +.P +The default zones are localhost, reverse 127.0.0.1 and ::1, and the AS112 +zones. The AS112 zones are reverse DNS zones for private use and reserved +IP addresses for which the servers on the internet cannot provide correct +answers. They are configured by default to give nxdomain (no reverse +information) answers. The defaults can be turned off by specifying your +own local\-zone of that name, or using the 'nodefault' type. Below is a +list of the default zone contents. +.TP 10 +\h'5'\fIlocalhost\fR +The IP4 and IP6 localhost information is given. NS and SOA records are provided +for completeness and to satisfy some DNS update tools. Default content: +.nf +local\-zone: "localhost." static +local\-data: "localhost. 10800 IN NS localhost." +local\-data: "localhost. 10800 IN + SOA localhost. nobody.invalid. 1 3600 1200 604800 10800" +local\-data: "localhost. 10800 IN A 127.0.0.1" +local\-data: "localhost. 10800 IN AAAA ::1" +.fi +.TP 10 +\h'5'\fIreverse IPv4 loopback\fR +Default content: +.nf +local\-zone: "127.in\-addr.arpa." static +local\-data: "127.in\-addr.arpa. 10800 IN NS localhost." +local\-data: "127.in\-addr.arpa. 10800 IN + SOA localhost. nobody.invalid. 1 3600 1200 604800 10800" +local\-data: "1.0.0.127.in\-addr.arpa. 10800 IN + PTR localhost." +.fi +.TP 10 +\h'5'\fIreverse IPv6 loopback\fR +Default content: +.nf +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." static +local\-data: "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. 10800 IN + NS localhost." +local\-data: "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. 10800 IN + SOA localhost. nobody.invalid. 1 3600 1200 604800 10800" +local\-data: "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. 10800 IN + PTR localhost." +.fi +.TP 10 +\h'5'\fIreverse RFC1918 local use zones\fR +Reverse data for zones 10.in\-addr.arpa, 16.172.in\-addr.arpa to +31.172.in\-addr.arpa, 168.192.in\-addr.arpa. +The \fBlocal\-zone:\fR is set static and as \fBlocal\-data:\fR SOA and NS +records are provided. +.TP 10 +\h'5'\fIreverse RFC3330 IP4 this, link\-local, testnet and broadcast\fR +Reverse data for zones 0.in\-addr.arpa, 254.169.in\-addr.arpa, +2.0.192.in\-addr.arpa (TEST NET 1), 100.51.198.in\-addr.arpa (TEST NET 2), +113.0.203.in\-addr.arpa (TEST NET 3), 255.255.255.255.in\-addr.arpa. +And from 64.100.in\-addr.arpa to 127.100.in\-addr.arpa (Shared Address Space). +.TP 10 +\h'5'\fIreverse RFC4291 IP6 unspecified\fR +Reverse data for zone +.nf +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. +.fi +.TP 10 +\h'5'\fIreverse RFC4193 IPv6 Locally Assigned Local Addresses\fR +Reverse data for zone D.F.ip6.arpa. +.TP 10 +\h'5'\fIreverse RFC4291 IPv6 Link Local Addresses\fR +Reverse data for zones 8.E.F.ip6.arpa to B.E.F.ip6.arpa. +.TP 10 +\h'5'\fIreverse IPv6 Example Prefix\fR +Reverse data for zone 8.B.D.0.1.0.0.2.ip6.arpa. This zone is used for +tutorials and examples. You can remove the block on this zone with: +.nf + local\-zone: 8.B.D.0.1.0.0.2.ip6.arpa. nodefault +.fi +You can also selectively unblock a part of the zone by making that part +transparent with a local\-zone statement. +This also works with the other default zones. +.\" End of local-zone listing. +.TP 5 +.B local\-data: \fI"<resource record string>" +Configure local data, which is served in reply to queries for it. +The query has to match exactly unless you configure the local\-zone as +redirect. If not matched exactly, the local\-zone type determines +further processing. If local\-data is configured that is not a subdomain of +a local\-zone, a transparent local\-zone is configured. +For record types such as TXT, use single quotes, as in +local\-data: 'example. TXT "text"'. +.IP +If you need more complicated authoritative data, with referrals, wildcards, +CNAME/DNAME support, or DNSSEC authoritative service, setup a stub\-zone for +it as detailed in the stub zone section below. +.TP 5 +.B local\-data\-ptr: \fI"IPaddr name" +Configure local data shorthand for a PTR record with the reversed IPv4 or +IPv6 address and the host name. For example "192.0.2.4 www.example.com". +TTL can be inserted like this: "2001:DB8::4 7200 www.example.com" +.SS "Remote Control Options" +In the +.B remote\-control: +clause are the declarations for the remote control facility. If this is +enabled, the \fIunbound\-control\fR(8) utility can be used to send +commands to the running unbound server. The server uses these clauses +to setup SSLv3 / TLSv1 security for the connection. The +\fIunbound\-control\fR(8) utility also reads the \fBremote\-control\fR +section for options. To setup the correct self\-signed certificates use the +\fIunbound\-control\-setup\fR(8) utility. +.TP 5 +.B control\-enable: \fI<yes or no> +The option is used to enable remote control, default is "no". +If turned off, the server does not listen for control commands. +.TP 5 +.B control\-interface: <ip address> +Give IPv4 or IPv6 addresses to listen on for control commands. +By default localhost (127.0.0.1 and ::1) is listened to. +Use 0.0.0.0 and ::0 to listen to all interfaces. +.TP 5 +.B control\-port: <port number> +The port number to listen on for control commands, default is 8953. +If you change this port number, and permissions have been dropped, +a reload is not sufficient to open the port again, you must then restart. +.TP 5 +.B server\-key\-file: "<private key file>" +Path to the server private key, by default unbound_server.key. +This file is generated by the \fIunbound\-control\-setup\fR utility. +This file is used by the unbound server, but not by \fIunbound\-control\fR. +.TP 5 +.B server\-cert\-file: "<certificate file.pem>" +Path to the server self signed certificate, by default unbound_server.pem. +This file is generated by the \fIunbound\-control\-setup\fR utility. +This file is used by the unbound server, and also by \fIunbound\-control\fR. +.TP 5 +.B control\-key\-file: "<private key file>" +Path to the control client private key, by default unbound_control.key. +This file is generated by the \fIunbound\-control\-setup\fR utility. +This file is used by \fIunbound\-control\fR. +.TP 5 +.B control\-cert\-file: "<certificate file.pem>" +Path to the control client certificate, by default unbound_control.pem. +This certificate has to be signed with the server certificate. +This file is generated by the \fIunbound\-control\-setup\fR utility. +This file is used by \fIunbound\-control\fR. +.SS "Stub Zone Options" +.LP +There may be multiple +.B stub\-zone: +clauses. Each with a name: and zero or more hostnames or IP addresses. +For the stub zone this list of nameservers is used. Class IN is assumed. +The servers should be authority servers, not recursors; unbound performs +the recursive processing itself for stub zones. +.P +The stub zone can be used to configure authoritative data to be used +by the resolver that cannot be accessed using the public internet servers. +This is useful for company\-local data or private zones. Setup an +authoritative server on a different host (or different port). Enter a config +entry for unbound with +.B stub\-addr: +<ip address of host[@port]>. +The unbound resolver can then access the data, without referring to the +public internet for it. +.P +This setup allows DNSSEC signed zones to be served by that +authoritative server, in which case a trusted key entry with the public key +can be put in config, so that unbound can validate the data and set the AD +bit on replies for the private zone (authoritative servers do not set the +AD bit). This setup makes unbound capable of answering queries for the +private zone, and can even set the AD bit ('authentic'), but the AA +('authoritative') bit is not set on these replies. +.TP +.B name: \fI<domain name> +Name of the stub zone. +.TP +.B stub\-host: \fI<domain name> +Name of stub zone nameserver. Is itself resolved before it is used. +.TP +.B stub\-addr: \fI<IP address> +IP address of stub zone nameserver. Can be IP 4 or IP 6. +To use a nondefault port for DNS communication append '@' with the port number. +.TP +.B stub\-prime: \fI<yes or no> +This option is by default off. If enabled it performs NS set priming, +which is similar to root hints, where it starts using the list of nameservers +currently published by the zone. Thus, if the hint list is slightly outdated, +the resolver picks up a correct list online. +.TP +.B stub\-first: \fI<yes or no> +If enabled, a query is attempted without the stub clause if it fails. +The data could not be retrieved and would have caused SERVFAIL because +the servers are unreachable, instead it is tried without this clause. +The default is no. +.SS "Forward Zone Options" +.LP +There may be multiple +.B forward\-zone: +clauses. Each with a \fBname:\fR and zero or more hostnames or IP +addresses. For the forward zone this list of nameservers is used to +forward the queries to. The servers listed as \fBforward\-host:\fR and +\fBforward\-addr:\fR have to handle further recursion for the query. Thus, +those servers are not authority servers, but are (just like unbound is) +recursive servers too; unbound does not perform recursion itself for the +forward zone, it lets the remote server do it. Class IN is assumed. +A forward\-zone entry with name "." and a forward\-addr target will +forward all queries to that other server (unless it can answer from +the cache). +.TP +.B name: \fI<domain name> +Name of the forward zone. +.TP +.B forward\-host: \fI<domain name> +Name of server to forward to. Is itself resolved before it is used. +.TP +.B forward\-addr: \fI<IP address> +IP address of server to forward to. Can be IP 4 or IP 6. +To use a nondefault port for DNS communication append '@' with the port number. +.TP +.B forward\-first: \fI<yes or no> +If enabled, a query is attempted without the forward clause if it fails. +The data could not be retrieved and would have caused SERVFAIL because +the servers are unreachable, instead it is tried without this clause. +The default is no. +.SS "Python Module Options" +.LP +The +.B python: +clause gives the settings for the \fIpython\fR(1) script module. This module +acts like the iterator and validator modules do, on queries and answers. +To enable the script module it has to be compiled into the daemon, +and the word "python" has to be put in the \fBmodule\-config:\fR option +(usually first, or between the validator and iterator). +.TP +.B python\-script: \fI<python file>\fR +The script file to load. +.SH "MEMORY CONTROL EXAMPLE" +In the example config settings below memory usage is reduced. Some service +levels are lower, notable very large data and a high TCP load are no longer +supported. Very large data and high TCP loads are exceptional for the DNS. +DNSSEC validation is enabled, just add trust anchors. +If you do not have to worry about programs using more than 3 Mb of memory, +the below example is not for you. Use the defaults to receive full service, +which on BSD\-32bit tops out at 30\-40 Mb after heavy usage. +.P +.nf +# example settings that reduce memory usage +server: + num\-threads: 1 + outgoing\-num\-tcp: 1 # this limits TCP service, uses less buffers. + incoming\-num\-tcp: 1 + outgoing\-range: 60 # uses less memory, but less performance. + msg\-buffer\-size: 8192 # note this limits service, 'no huge stuff'. + msg\-cache\-size: 100k + msg\-cache\-slabs: 1 + rrset\-cache\-size: 100k + rrset\-cache\-slabs: 1 + infra\-cache\-numhosts: 200 + infra\-cache\-slabs: 1 + key\-cache\-size: 100k + key\-cache\-slabs: 1 + neg\-cache\-size: 10k + num\-queries\-per\-thread: 30 + target\-fetch\-policy: "2 1 0 0 0 0" + harden\-large\-queries: "yes" + harden\-short\-bufsize: "yes" +.fi +.SH "FILES" +.TP +.I @UNBOUND_RUN_DIR@ +default unbound working directory. +.TP +.I @UNBOUND_CHROOT_DIR@ +default +\fIchroot\fR(2) +location. +.TP +.I @ub_conf_file@ +unbound configuration file. +.TP +.I @UNBOUND_PIDFILE@ +default unbound pidfile with process ID of the running daemon. +.TP +.I unbound.log +unbound log file. default is to log to +\fIsyslog\fR(3). +.SH "SEE ALSO" +\fIunbound\fR(8), +\fIunbound\-checkconf\fR(8). +.SH "AUTHORS" +.B Unbound +was written by NLnet Labs. Please see CREDITS file +in the distribution for further details. |