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-.TH "unbound" "8" "Jun 13, 2017" "NLnet Labs" "unbound 1.6.3"
-.\"
-.\" unbound.8 -- unbound manual
-.\"
-.\" Copyright (c) 2007, NLnet Labs. All rights reserved.
-.\"
-.\" See LICENSE for the license.
-.\"
-.\"
-.SH "NAME"
-.B unbound
-\- Unbound DNS validating resolver 1.6.3.
-.SH "SYNOPSIS"
-.B unbound
-.RB [ \-h ]
-.RB [ \-d ]
-.RB [ \-v ]
-.RB [ \-c
-.IR cfgfile ]
-.SH "DESCRIPTION"
-.B Unbound
-is a caching DNS resolver.
-.P
-It uses a built in list of authoritative nameservers for the root zone (.),
-the so called root hints.
-On receiving a DNS query it will ask the root nameservers for
-an answer and will in almost all cases receive a delegation to a top level
-domain (TLD) authoritative nameserver.
-It will then ask that nameserver for an answer.
-It will recursively continue until an answer is found or no answer is
-available (NXDOMAIN).
-For performance and efficiency reasons that answer is cached for a
-certain time (the answer's time\-to\-live or TTL).
-A second query for the same name will then be answered from the cache.
-Unbound can also do DNSSEC validation.
-.P
-To use a locally running
-.B Unbound
-for resolving put
-.sp
-.RS 6n
-nameserver 127.0.0.1
-.RE
-.sp
-into
-.IR resolv.conf (5).
-.P
-If authoritative DNS is needed as well using
-.IR nsd (8),
-careful setup is required because authoritative nameservers and
-resolvers are using the same port number (53).
-.P
-The available options are:
-.TP
-.B \-h
-Show the version and commandline option help.
-.TP
-.B \-c\fI cfgfile
-Set the config file with settings for unbound to read instead of reading the
-file at the default location, @ub_conf_file@. The syntax is
-described in \fIunbound.conf\fR(5).
-.TP
-.B \-d
-Debug flag: do not fork into the background, but stay attached to
-the console.  This flag will also delay writing to the log file until
-the thread\-spawn time, so that most config and setup errors appear on
-stderr. If given twice or more, logging does not switch to the log file
-or to syslog, but the log messages are printed to stderr all the time.
-.TP
-.B \-v
-Increase verbosity. If given multiple times, more information is logged.
-This is in addition to the verbosity (if any) from the config file.
-.SH "SEE ALSO"
-\fIunbound.conf\fR(5),
-\fIunbound\-checkconf\fR(8),
-\fInsd\fR(8).
-.SH "AUTHORS"
-.B Unbound
-developers are mentioned in the CREDITS file in the distribution.