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RedHat 9 (Linux i386) - man page for host.conf (redhat section 5)

HOST.CONF(5)			   Linux System Administration			     HOST.CONF(5)

NAME
       host.conf - resolver configuration file

DESCRIPTION
       The  file  /etc/host.conf  contains  configuration  information	specific  to the resolver
       library.  It should contain one configuration keyword per line,	followed  by  appropriate
       configuration  information.   The keywords recognized are order, trim, multi, nospoof, and
       reorder.  These keywords are described below.

       order  This keyword specifies how host lookups are to be performed.  It should be followed
	      by one or more lookup methods, separated by commas.  Valid methods are bind, hosts,
	      and nis.

       trim   This keyword may be listed more than once.  Each time it should be  followed  by	a
	      single domain name, with the leading dot.  When set, the resolv+ library will auto-
	      matically trim the given domain name from the end of any hostname resolved via DNS.
	      This  is	intended  for use with local hosts and domains.  (Related note: trim will
	      not affect host- names gathered via NIS or the hosts file.  Care should be taken to
	      ensure  that the first hostname for each entry in the hosts file is fully qualified
	      or non-qualified, as appropriate for the local installation.)

       multi  Valid values are on and off.  If set to on, the resolv+  library	will  return  all
	      valid addresses for a host that appears in the /etc/hosts file, instead of only the
	      first.  This is off by default, as it may cause a substantial performance  loss  at
	      sites with large hosts files.

       nospoof
	      Valid  values  are  on  and off.	If set to on, the resolv+ library will attempt to
	      prevent hostname spoofing to enhance the security of rlogin and rsh.  It	works  as
	      follows:	after  performing  a host address lookup, resolv+ will perform a hostname
	      lookup for that address.	If the two hostnames do not match, the query will fail.

       spoofalert
	      If this option is set to on and the nospoof option is also set, resolv+ will log	a
	      warning of the error via the syslog facility.  The default value is off.

       reorder
	      Valid  values  are  on and off.  If set to on, resolv+ will attempt to reorder host
	      addresses so that local addresses (i.e., on the same subnet) are listed first  when
	      a  gethostbyname(3)  is performed.  Reordering is done for all lookup methods.  The
	      default value is off.

FILES
       /etc/host.conf
	      Resolver configuration file

       /etc/resolv.conf
	      Resolver configuration file

       /etc/hosts
	      Local hosts database

SEE ALSO
       gethostbyname(3), hostname(7), resolv+(8), named(8)

Debian GNU/Linux			    1997-01-02				     HOST.CONF(5)


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