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gai.conf(5)                                                        gai.conf(5)



NAME
       gai.conf - getaddrinfo(3) configuration file


DESCRIPTION
       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 and 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 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 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
              precedence  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'.


       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 necessary.


EXAMPLE
       The default table according to RFC 3484 would be specified with the following  con-
       figuration file:

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



FILES
       /etc/gai.conf


AUTHOR
       Ulrich Drepper <drepper AT redhat.com>


SEE ALSO
       getaddrinfo(3), RFC 3484



gai.conf                           May 2006                        gai.conf(5)

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