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-rw-r--r--posix/gai.conf26
1 files changed, 19 insertions, 7 deletions
diff --git a/posix/gai.conf b/posix/gai.conf
index 5f063f5c3c..0e334ac2c5 100644
--- a/posix/gai.conf
+++ b/posix/gai.conf
@@ -24,17 +24,29 @@
#label 2002::/16 2
#label ::/96 3
#label ::ffff:0:0/96 4
+#label fec0::/10 5
+#label fc00::/7 6
+#
+# This default differs from the tables given in RFC 3484 by handling
+# (now obsolete) site-local IPv6 addresses and Unique Local Addresses.
+# The reason for this difference is that these addresses are never
+# NATed while IPv4 site-local addresses most probably are. Given
+# the precedence of IPv6 over IPv4 (see below) on machines having only
+# site-local IPv4 and IPv6 addresses a lookup for a global address would
+# see the IPv6 be preferred. The result is a long delay because the
+# site-local IPv6 addresses cannot be used while the IPv4 address is
+# (at least for the foreseeable future) NATed.
#
# precedence <mask> <value>
-# Add another rule the to RFC 3484 precendence table. See section 2.1
+# Add another rule the to RFC 3484 precedence table. See section 2.1
# and 10.3 in RFC 3484. The default is:
#
-#precendence ::1/128 50
-#precendence ::/0 40
-#precendence 2002::/16 30
-#precendence ::/96 20
-#precendence ::ffff:0:0/96 10
+#precedence ::1/128 50
+#precedence ::/0 40
+#precedence 2002::/16 30
+#precedence ::/96 20
+#precedence ::ffff:0:0/96 10
#
# For sites which prefer IPv4 connections change the last line to
#
-#precendence ::ffff:0:0/96 100
+#precedence ::ffff:0:0/96 100