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unbound(8)			 unbound 1.5.3			    unbound(8)

       unbound - Unbound DNS validating	resolver 1.5.3.

       unbound [-h] [-d] [-v] [-c cfgfile]

       Unbound is a caching DNS	resolver.

       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 con-
       tinue until an answer is	found or no answer  is	available  (NXDOMAIN).
       For performance and efficiency reasons that answer is cached for	a cer-
       tain 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.

       To use a	locally	running	Unbound	for resolving put


       into resolv.conf(5).

       If authoritative	DNS is needed as well using nsd(8), careful  setup  is
       required	 because authoritative nameservers and resolvers are using the
       same port number	(53).

       The available options are:

       -h     Show the version and commandline option help.

       -c cfgfile
	      Set the config file with settings	for unbound to read instead of
	      reading	  the	  file	   at	  the	  default    location,
	      /var/unbound/unbound.conf.   The	 syntax	  is   described    in

       -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.

       -v     Increase verbosity. If given multiple times, more	information is
	      logged.	This is	in addition to the verbosity (if any) from the
	      config file.

       unbound.conf(5),	unbound-checkconf(8), nsd(8).

       Unbound developers are mentioned	in the CREDITS file in	the  distribu-

NLnet Labs			 Mar 10, 2015			    unbound(8)


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