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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 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 get
       the chance to dynamically change the sorting.  For the glibc  implemen‐
       tation 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 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 con‐
	      figuration 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 neces‐
	      sary.

EXAMPLE
       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

FILES
       /etc/gai.conf

AUTHOR
       Ulrich Drepper <drepper redhat com>

SEE ALSO
       getaddrinfo(3), RFC 3484

gai.conf			   May 2006			   gai.conf(5)
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