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espec:man-resolv.conf [2008/06/11 15:55]
maziero created
espec:man-resolv.conf [2008/06/11 15:55] (atual)
maziero created
Linha 1: Linha 1:
 +<​code>​
 +RESOLV.CONF(5) ​            Linux Programmer'​s Manual ​           RESOLV.CONF(5)
  
 +
 +
 +NAME
 +       ​resolv.conf - resolver configuration file
 +
 +SYNOPSIS
 +       /​etc/​resolv.conf
 +
 +DESCRIPTION
 +       ​The ​ ________ is a set of routines in the C library that provide access
 +       to the Internet Domain Name System (DNS). ​ The  resolver ​ configuration
 +       ​file ​ contains ​ information ​ that  is read by the resolver routines the
 +       first time they are invoked by a process. ​ The file is designed ​ to  be
 +       human readable and contains a list of keywords with values that provide
 +       ​various types of resolver information.
 +
 +       If this file doesn'​t exist the only name server to be queried ​ will  be
 +       ​on ​ the local machine; the domain name is determined from the host name
 +       and the domain search path is constructed from the domain name.
 +
 +       The different configuration options are:
 +
 +       ​nameserver Name server IP address
 +              Internet address (in dot notation) of a  name  server ​ that  the
 +              resolver ​  ​should ​  ​query. ​   Up  to  MAXNS  (currently ​ 3,  see
 +              __________) name servers may be listed, ​ one  per  keyword. ​  If
 +              there are multiple servers, the resolver library queries them in
 +              the order listed. ​ If no nameserver ​ entries ​ are  present, ​ the
 +              default ​ is  to  use the name server on the local machine. ​ (The
 +              algorithm used is to try a name server, and if the  query  times
 +              out, try the next, until out of name servers, then repeat trying
 +              all the name servers until  a  maximum ​ number ​ of  retries ​ are
 +              made.)
 +
 +       ​domain Local domain name.
 +              Most  queries ​ for  names within this domain can use short names
 +              relative to the local domain. ​ If no domain ​ entry  is  present,
 +              the  domain ​ is  determined from the local host name returned by
 +              gethostname(3);​ the domain part is taken to be everything ​ after
 +              the  first  '​.'​. ​  ​Finally, ​ if the host name does not contain a
 +              domain part, the root domain is assumed.
 +
 +       ​search Search list for host-name lookup.
 +              The search list is normally determined ​ from  the  local  domain
 +              name;  by default, it contains only the local domain name.  This
 +              may be changed by listing the desired domain search path follow-
 +              ing the ______ keyword with spaces or tabs separating the names.
 +              Resolver queries having fewer than _____ dots (default is 1)  in
 +              them  will  be attempted using each component of the search path
 +              in turn until a match is found. ​ For environments with  multiple
 +              subdomains ​ please ​ read  options ndots:_ below to avoid man-in-
 +              the-middle attacks and unnecessary ​ traffic ​ for  the  root-dns-
 +              servers. ​ Note that this process may be slow and will generate a
 +              lot of network traffic if the servers for the listed domains are
 +              not local, and that queries will time out if no server is avail-
 +              able for one of the domains.
 +
 +              The search list is currently limited to six domains with a total
 +              of 256 characters.
 +
 +       ​sortlist
 +              Sortlist ​ allows ​ addresses ​ returned ​ by gethostbyname(3) to be
 +              sorted. ​ A sortlist is specified by IP  address ​ netmask ​ pairs.
 +              The  netmask ​ is optional and defaults to the natural netmask of
 +              the net.  The IP address and optional network ​ pairs  are  sepa-
 +              rated by slashes. ​ Up to 10 pairs may be specified. ​ E.g.,
 +                  sortlist 130.155.160.0/​255.255.240.0 130.155.0.0
 +
 +       ​options
 +              Options ​ allows ​ certain internal resolver variables to be modi-
 +              fied.  The syntax is
 +
 +                     ​options ______ ___
 +
 +              where ______ is one of the following:
 +
 +              debug  sets RES_DEBUG in ____________.
 +
 +              ndots:_
 +                     sets a threshold for the number of dots which must appear
 +                     ​in ​ a name given to res_query(3) (see resolver(3)) before
 +                     an _______ ________ _____ will be made.  The default ​ for
 +                     _ is 1, meaning that if there are any dots in a name, the
 +                     name will be tried first as an absolute name  before ​ any
 +                     ​______ ____ elements are appended to it.
 +
 +              timeout:_
 +                     ​sets ​ the  amount ​ of  time  the resolver will wait for a
 +                     ​response from a remote name server ​ before ​ retrying ​ the
 +                     ​query ​ via a different name server. ​ Measured in seconds,
 +                     the default is RES_TIMEOUT (currently 5, see __________).
 +
 +              attempts:_
 +                     ​sets ​ the  number of times the resolver will send a query
 +                     to its name servers before giving ​ up  and  returning ​ an
 +                     ​error ​  ​to ​ the  calling ​ application. ​  ​The ​ default ​ is
 +                     ​RES_DFLRETRY (currently 2, see __________).
 +
 +              rotate sets RES_ROTATE in ____________,​ which causes round robin
 +                     ​selection ​ of  nameservers from among those listed. ​ This
 +                     has the effect of spreading ​ the  query  load  among  all
 +                     ​listed ​ servers, ​ rather ​ than having all clients try the
 +                     first listed server first every time.
 +
 +              no-check-names
 +                     sets RES_NOCHECKNAME in ____________,​ which disables ​ the
 +                     ​modern ​ BIND  checking ​ of  incoming ​ host names and mail
 +                     names for invalid characters such as underscore (_), non-
 +                     ​ASCII,​ or control characters.
 +
 +              inet6  sets  RES_USE_INET6 in ____________. ​ This has the effect
 +                     of trying a AAAA query before an A query inside the geth-
 +                     ​ostbyname(3) ​ function, ​ and of mapping IPv4 responses in
 +                     IPv6 "​tunneled form" if no AAAA records are found but  an
 +                     A record set exists.
 +
 +                     Some programs behave strangely when this option is turned
 +                     on.
 +
 +       The ______ and ______ keywords are mutually exclusive. ​  ​If ​ more  than
 +       one instance of these keywords is present, the last instance wins.
 +
 +       ​The ​ ______ keyword of a system'​s ___________ file can be overridden on
 +       a per-process basis by setting the environment variable LOCALDOMAIN ​ to
 +       a space-separated list of search domains.
 +
 +       ​The ​ _______ keyword of a system'​s ___________ file can be amended on a
 +       ​per-process basis by setting the environment variable RES_OPTIONS to  a
 +       ​space-separated ​ list  of  resolver ​ options ​ as  explained above under
 +       ​options.
 +
 +       The keyword and value must appear on a single ​ line,  and  the  keyword
 +       ​(e.g.,​ nameserver) must start the line.  The value follows the keyword,
 +       ​separated by white space.
 +
 +FILES
 +       ​________________,​ __________
 +
 +SEE ALSO
 +       ​gethostbyname(3),​ resolver(3),​ hostname(7),​ named(8)
 +       Name Server Operations Guide for BIND
 +
 +COLOPHON
 +       This page is part of release 2.77 of the Linux  _________ ​ project. ​  A
 +       ​description ​ of  the project, and information about reporting bugs, can
 +       be found at http://​www.kernel.org/​doc/​man-pages/​.
 +
 +
 +
 +4th Berkeley Distribution ​        ​2004-10-31 ​                   RESOLV.CONF(5)
 +</​code>​
espec/man-resolv.conf.txt · Última modificação: 2008/06/11 15:55 por maziero