resolver man page on DigitalUNIX

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resolver(4)							   resolver(4)

NAME
       resolver - resolver configuration file

SYNOPSIS
       /etc/resolv.conf

DESCRIPTION
       The  resolver is a set of routines in the C library that provide access
       to the Internet Domain Name System.  The	 resolver  configuration  file
       (resolv.conf)  contains	information  that is read by the resolver rou‐
       tines the first time they  are  invoked	by  a  process.	 The  file  is
       designed to be read by humans and contains a list of keywords with val‐
       ues that provide various types of resolver information.

       The different configuration options are: Internet address (in dot nota‐
       tion)  of  a  name  server  that the resolver should query. Up to MAXNS
       (currently 3) 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).  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(); the domain part is taken to be every‐
       thing after the first dot (.).  Finally, if the host name does not con‐
       tain  a	domain part, the root domain is assumed.  Search list for host
       name lookup. By default, the search list consists of the	 local	domain
       name.   You  can	 change	 this system wide by specifying search keyword
       followed by a list of domain names separated by spaces or tabs, or on a
       per-process  basis  by  specifying the LOCALDOMAIN environment variable
       followed by a list of domain names separated by spaces or tabs.

	      Most resolver queries will be attempted using each component  of
	      the  search  path	 in turn until a match is found.  This process
	      might be slow and 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 available for one of the domains.

	      The search list is currently limited to six domains with a total
	      of 256 characters.  Enables the sorting of addresses returned by
	      gethostname.  A sortlist comprises pairs	of  IP	addresses  and
	      optional netmasks; each IP address and optional netmask are sep‐
	      arated by a slash character (/).	The netmask is	optional,  and
	      defaults	to the current network netmask.	 You can specify up to
	      10 pairs.	 For example:

	      sortlist 130.155.160.0/255.255.240.0 130.155.0.0 Option for host
	      name  lookup.  By default, when a host name contains one or more
	      dots (.), resolver looks up the name as  given  before  applying
	      the  search  list.  The n specifies the minimum number of dots a
	      name must contain in order to  be	 looked	 up  as	 given	before
	      applying the search list.	 The range is from 0 to 15.

	      You  can	change	the resolver options system wide by specifying
	      options keyword followed a list of resolver options separated by
	      spaces,  or on a per-process basis by specifying the RES_OPTIONS
	      environment variable followed by a list of resolver options sep‐
	      arated by spaces.

       The domain and search keywords are mutually exclusive. If more than one
       instance of these keywords is present, the last instance will override.

       The keyword and value must appear on a single  line,  and  the  keyword
       (for  example,  nameserver) must start the line.	 The value follows the
       keyword, separated by white space.

FILES
       /etc/resolv.conf

SEE ALSO
       Functions:  dn_comp(3),	dn_expand(3),  gethostbyname(3),  res_init(3),
       res_mkquery(3), res_query(3), res_search(3), res_send(3)

       Files: hostname(5)

       Commands: named(8)

								   resolver(4)
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