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           A  call  to getaddrinfo(3) might return multiple answers.  According to
           RFC 3484 these answers must be sorted so that the answer with the high-
           est  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
           should have the possibility to dynamically change the sorting.  For the
           glibc implementation, this can be achieved with the /etc/gai.conf file.
           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 sort-
                  ing.   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  con-
                  tain a network mask and a label value.
           precedence netmask precedence
                  This   keyword  is  similar  to  label, but instead the value is
                  added to the precedence table as specified  in  RFC 3484.   Once
                  again,  the presence of a single precedence line in the configu-
                  ration file causes the default table to not be used.
           reload <yes|no>
                  This keyword controls whether a process checks whether the  con-
                  figuration  file  has  been  changed  since the last time it was
                  read.  If the value is "yes" the file is  re-read.   This  might
                  cause  problems in multithreaded applications and is generally a
                  bad idea.  The default is "no".
           scopev4 mask value
                  Add another rule to the RFC 3484 scope table for  IPv4  address.
                  By  default,  the scope IDs described in section 3.2 in RFC 3438
                  are used.  Changing these defaults should hardly ever be  neces-




           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

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