Linux 2.6 - man page for gai.conf (linux section 5)
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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 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.
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-
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
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Linux 2013-02-13 GAI.CONF(5)
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