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       gai.conf - getaddrinfo(3) configuration file


       A  call  to getaddrinfo(3) might return multiple answers.  According to
       RFC 3484 these answers must be sorted  so  that  the  answer  with  the
       highest  success  rate  is  first  in  the  list.   The RFC provides an
       algorithm for the sorting.  The static rules are not  always  adequate,
       though.    For   this   reason   the  RFC  also  requires  that  system
       administrators get the chance to dynamically change the  sorting.   For
       the  glibc  implementation  this can be achieved with the /etc/gai.conf

       Each line in the configuration file  consists  of  a  keyword  and  its
       parameters.   White  spaces  in  any place are ignored.  Lines starting
       with `#' are comments and are ignored.

       The keywords currently recognized are:

       label netmask precedence
              The value is added to the label  table  used  in  the  RFC  3484
              sorting.    If   any   label   definition   is  present  in  the
              configuration file is present the default  table  is  not  used.
              All  the  label definitions of the default table which are to be
              maintained have to be duplicated.   Following  the  keyword  the
              line has to contain a network mask and a label value.

       precedence netmask precedence
              This  keyword is similar to label but instead the value is added
              to the precendence table as specified in RFC 3484.  Once  again,
              the  presence  of  a single precedence line in the configuration
              file causes the default table to not be used.

       reload <yes|no>
              This keyword  control  whether  a  process  checks  whether  the
              configuration  file  has been changes since the last time it was
              read.  If the value is `yes' the file is  re-read.   This  might
              cause problems in multi-threaded applications and is generally a
              bad idea.  The default is `no'.


       The default table according to RFC 3484 would  be  specified  with  the
       following configuration file:

       label  ::1/128       0
       label  ::/0          1
       label  2002::/16     2
       label ::/96          3
       label ::ffff:0:0/96  4
       precendence  ::1/128       50
       precendence  ::/0          40
       precendence  2002::/16     30
       precendence ::/96          20
       precendence ::ffff:0:0/96  10




       Ulrich Drepper <drepper redhat com>


       getaddrinfo(3), RFC 3484