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GAI.CONF(5)		   Linux Programmer's Manual		   GAI.CONF(5)

       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 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 reread.  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
       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

       getaddrinfo(3), RFC 3484

       This  page  is  part of release 3.65 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at

Linux				  2013-02-13			   GAI.CONF(5)

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