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    Command:

    host.conf

    
    
    

    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, spoof, 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 list of domains,  separated  by  colons  (':'),
                  semicolons  (';')  or  commas (','), with the leading dot.  When
                  set, the resolv+  library  will  automatically  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 hostnames gathered via NIS or the
                  hosts file.  Care should be taken to ensure that the first host-
                  name  for  each  entry  in  the hosts file is fully qualified or
                  unqualified, 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 secu-
                  rity 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.  The default value is off.
    
           spoofalert
                  Valid  values  are  on and off.  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.
    
           spoof  Valid values are off, nowarn and warn.  If this option is set to
                  off, spoofed addresses are permitted and  no  warnings  will  be
                  emitted via the syslog facility.  If this option is set to warn,
                  resolv+ will attempt to prevent hostname spoofing to enhance the
                  security and log a warning of the error via the syslog facility.
                  If this option is  set  to  nowarn,  the  resolv+  library  will
                  attempt to prevent hostname spoofing to enhance the security but
                  not emit warnings via the syslog facility.  Setting this  option
                  to anything else is equal to setting it to nowarn.
    
           reorder
           RESOLV_SERV_ORDER
                  Overrides the order command.
    
           RESOLV_SPOOF_CHECK
                  Overrides the nospoof, spoofalert and spoof commands in the same
                  way as the spoof command  is  parsed.   Valid  values  are  off,
                  nowarn and warn.
    
           RESOLV_MULTI
                  Overrides the multi command.
    
           RESOLV_REORDER
                  Overrides the reorder command.
    
           RESOLV_ADD_TRIM_DOMAINS
                  A  list of domains,  separated by colons (':'), semicolons (';')
                  or commas (','), with the leading dot, which will  be  added  to
                  the list of domains that should be trimmed.
    
           RESOLV_OVERRIDE_TRIM_DOMAINS
                  A  list of domains,  separated by colons (':'), semicolons (';')
                  or commas (','), with the leading dot, which  will  replace  the
                  list of domains that should be trimmed.  Overrides the trim com-
                  mand.
    
    
    

    FILES

           /etc/host.conf
                  Resolver configuration file
    
           /etc/resolv.conf
                  Resolver configuration file
    
           /etc/hosts
                  Local hosts database
    
    
    

    NOTES

           The following differences exist compared to  the  original  implementa-
           tion.    A   new   command   spoof   and  a  new  environment  variable
           RESOLV_SPOOF_CHECK can take arguments like off, nowarn and warn.   Line
           comments can appear anywhere and not only at the beginning of a line.
    
    
    

    SEE ALSO

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

    Linux 2003-08-23 HOST.CONF(5)

    
    
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