Provided by: libc-bin_2.15-0ubuntu10_amd64 bug


       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 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.


       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
       precedence  ::1/128       50
       precedence  ::/0          40
       precedence  2002::/16     30
       precedence ::/96          20
       precedence ::ffff:0:0/96  10




       Ulrich Drepper <drepper redhat com>


       getaddrinfo(3), RFC 3484