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.  Each keyword is
       described seperately below.

       order  This keyword specifies how host lookups are  to  be
              performed.   It  should  be followed by one or more
              lookup methods, seperated 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 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 host-
              names gathered via NIS or  the  hosts  file.   Care
              should  be  taken to insure 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+

              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)


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