doc

git-svn-id: https://map66.svn.sourceforge.net/svnroot/map66@48 3484d885-4da6-438d-b19d-107d078dd756

1 files changed, 34 insertions, 21 deletions

diff --git a/README.dbk b/README.dbk
index de4a3c4..8f1434b 100644
--- a/README.dbk
+++ b/README.dbk
@@ -19,7 +19,7 @@
       </affiliation>
     </author>
 
-    <pubdate>13-OCT-2010</pubdate>
+    <pubdate>16-OCT-2010</pubdate>
   </articleinfo>
 
   <para>These files implement a Linux netfilter target that changes the IPv6
@@ -36,9 +36,9 @@
   url="http://tools.ietf.org/html/draft-mrw-behave-nat66-02">http://tools.ietf.org/html/draft-mrw-behave-nat66-02</ulink></para>
 
   <warning>
-    <para>Using MAP66 rules together with connection tracking rules sich as
+    <para>Using MAP66 rules together with connection tracking rules such as
     <userinput>--ctstate</userinput> is currently untested and may not work or
-    may cause oopses.</para>
+    may cause dysfunctions.</para>
   </warning>
 
   <section id="install">
@@ -242,8 +242,8 @@ ip6tables -t mangle -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-
     rules is compiled in. For this reason, you may want to change the
     precedence rules within <filename>/etc/gai.conf</filename> (see <xref
     endterm="precedence-gai-title" linkend="precedence-gai" />) or use another
-    prefix (see <xref endterm="precedence-6to4-title"
-    linkend="precedence-6to4" />).</para>
+    prefix (see <xref endterm="precedence-addrs-title"
+    linkend="precedence-addrs" />).</para>
 
     <section id="precedence-gai">
       <title id="precedence-gai-title">Change gai.conf</title>
@@ -291,25 +291,38 @@ ip6tables -t mangle -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --clamp-
       else is unchanged.</para>
     </section>
 
-    <section id="precedence-6to4">
-      <title id="precedence-6to4-title">Use 6to4 Internal Address</title>
+    <section id="precedence-addrs">
+      <title id="precedence-addrs-title">Use Changed Internal Address</title>
 
-      <para>As an alternative solution, you may use 6to4 addresses in your
-      LAN. While the well known IPv4 adresses 10.0.0.0/8, 172.16.0.0/12, and
-      192.168.0.0/16 still exist, it is unlikely that their 6to4 counterparts
-      2002:0a00::/24, 2002:ac10::/28, and 2002:c0a8::/32 will be routed on the
-      Internet. Because 6to4 adresses are part of the official 2002::/3
-      address prefix for the Internet, no difference between these addresses
-      and other Internet addresses are made by getaddrinfo().</para>
+      <para>As an alternative solution, you may use an arbitrary address
+      prefix in your LAN that is not mentioned in the
+      <filename>gai.conf</filename> file nor compiled in. This will work but
+      introduces a double mapping: one map (Inet-ULA) on the Internet gateway
+      router and a second map (ULA-Intern) on the internal router. </para>
 
-      <para>If you already deployed ULA adresses in your network, you may be
-      interested in a solution that runs on my Freifunk router. The router
-      uses the IPv4 192.168.65.65/26 on it's LAN interface. WIthin the
-      OLSR-based mesh network, any interface uses an fdca:ffee:babe::/64
-      prefix. The following internal mapping is configured for this: </para>
+      <note>
+        <para>While the well known IPv4 addresses 10.0.0.0/8, 172.16.0.0/12,
+        and 192.168.0.0/16 still exist, it is unlikely that their 6to4
+        counterparts 2002:0a00::/24, 2002:ac10::/28, and 2002:c0a8::/32 will
+        be routed on the Internet. Sadly, the (EKU)buntu defaults penalize
+        6to4 addresses also.</para>
+      </note>
 
-      <programlisting>ip6tables -t mangle -I PREROUTING -i br0 -s 2002:c0a8:4141::/64 -j MAP66 --src-to fdca:ffee:babe::/64 --csum
-ip6tables -t mangle -I POSTROUTING -o br0 -d fdca:ffee:babe::/64 -j MAP66 --dst-to 2002:c0a8:4141::/64 --csum</programlisting>
+      <para>If you already deployed ULA addresses in your network, you may be
+      interested in a solution that runs on my Freifunk router. The router
+      uses the IPv6 prefix that is reserved for documentation purposes on it's
+      LAN interface. WIthin the OLSR-based mesh network, any interface uses an
+      fdca:ffee:babe::/64 prefix. The following internal mapping is configured
+      for this:</para>
+
+      <programlisting>ip6tables -t mangle -I PREROUTING -i br0 -s 2001:0DB8::/64 -j MAP66 --src-to fdca:ffee:babe::/64 --csum
+ip6tables -t mangle -I POSTROUTING -o br0 -d fdca:ffee:babe::/64 -j MAP66 --dst-to 2001:0DB8::/64 --csum</programlisting>
+
+      <para>To prevent the mapped packets to vanish via the default route and
+      to overcome mac address lookups during the routing process, I also added
+      these prefixes to the router's <filename>/etc/radvd.conf</filename> as
+      well as (host) routes pointing to the <quote>br0</quote> interface for
+      both prefixes.</para>
     </section>
   </section>