Document problem with NATs in getaddrinfo.

diff --git a/ChangeLog b/ChangeLog
index 27678bf..dd6b608 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2010-04-03  Ulrich Drepper  <drepper@redhat.com>
 
+       [BZ #11438]
+       * posix/gai.conf: Document problems with IPv4 site-local addresses and
+       NATs.
+
        [BZ #11449]
        * crypt/crypt_util.c (__init_des_r): Add memory barrier before setting
        small_tables_initialized.

diff --git a/posix/gai.conf b/posix/gai.conf
index 3dba1a9..195287e 100644 (file)
--- a/posix/gai.conf
+++ b/posix/gai.conf
@@ -66,3 +66,12 @@
 #scopev4 ::ffff:172.16.0.0/108   5
 #scopev4 ::ffff:192.168.0.0/112  5
 #scopev4 ::ffff:0.0.0.0/96       14
+#
+#    For sites which use site-local IPv4 addresses behind NAT there is
+#    the problem that even if IPv4 addresses are preferred they do not
+#    have the same scope and are therefore not sorted first.  To change
+#    this use only these rules:
+#
+#scopev4 ::ffff:169.254.0.0/112  2
+#scopev4 ::ffff:127.0.0.0/104    2
+#scopev4 ::ffff:0.0.0.0/96       14