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Linux 2.6 - man page for gai.conf (linux section 5)

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 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
       should  have the possibility to dynamically change the sorting.	For the glibc implementa-
       tion, this can be achieved with the /etc/gai.conf file.

       Each line in the configuration file consists of a keyword and its parameters.  White  spa-
       ces 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 main-
	      tained 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  controls whether a process checks whether the configuration 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 necessary.


       The default table according to RFC 3484 would be specified with the  following  configura-
       tion 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 3.55 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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