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+IPv6 payload support
+--------------------
+
+Latest IPv6 payload support code and documentation can be found from here:
+
+  http://www.greenie.net/ipv6/openvpn.html
+
+For TODO list, see TODO.IPv6.
+
+Gert Doering, 31.12.2009
+
+
+
+IPv6 transport support
+----------------------
+
+[ Last updated: 25-Mar-2011. ]
+
+OpenVPN-2.1 over UDP6/TCP6 README for ipv6-0.4.x patch releases:
+( --udp6 and --tcp6-{client,server} )
+
+* Availability
+  Source code under GPLv2 from http://github.com/jjo/openvpn-ipv6
+
+  Distro ready repos/packages:
+  o Debian sid official repo, by Alberto Gonzalez Iniesta,
+    starting from openvpn_2.1~rc20-2
+  o Gentoo official portage tree, by Marcel Pennewiss:
+    - https://bugs.gentoo.org/show_bug.cgi?id=287896
+  o Ubuntu package, by Bernhard Schmidt:
+    - https://launchpad.net/~berni/+archive/ipv6/+packages
+  o Freetz.org, milestone freetz-1.2
+    - http://trac.freetz.org/milestone/freetz-1.2
+
+* Status:
+  o OK:
+    - upd6,tcp6: GNU/Linux, win32, openbsd-4.7, freebsd-8.1
+    - udp4->upd6,tcp4->tcp6 (ipv4/6 mapped): GNU/Linux
+      (gives a warning on local!=remote proto matching)
+  o NOT:
+    - win32: tcp4->tcp6 (ipv4/6 mapped) fails w/connection refused
+  o NOT tested:
+    - mgmt console
+
+* Build setup:
+  ./configure --enable-ipv6        (by default)
+
+* Usage:
+  For IPv6 just specify "-p upd6" an proper IPv6 hostnames, adapting the example
+  from man page ...
+
+  On may:
+    openvpn --proto udp6 --remote <june_IPv6_addr> --dev tun1 \
+      --ifconfig 10.4.0.1 10.4.0.2 --verb 5 --secret key
+
+  On june:
+    openvpn --proto udp6 --remote <may_IPv6_addr>  --dev tun1 \
+      --ifconfig 10.4.0.2 10.4.0.1 --verb 5 --secret key
+
+  Same for --proto tcp6-client, tcp6-server.
+
+* Main code changes summary:
+  - socket.h: New struct openvpn_sockaddr type that holds sockaddrs and pktinfo,
+    (here I omitted #ifdef USE_PF_xxxx, see socket.h )
+
+    struct openvpn_sockaddr {
+	union {
+		struct sockaddr sa;
+		struct sockaddr_in in;
+		struct sockaddr_in6 in6;
+	} addr;
+    };
+
+    struct link_socket_addr
+    {
+            struct openvpn_sockaddr local;
+            struct openvpn_sockaddr remote;
+            struct openvpn_sockaddr actual;
+    };
+
+    PRO: allows simple type overloading: local.addr.sa, local.addr.in, local.addr.in6 ... etc
+    (also local.pi.in and local.pi.in6)
+
+  - several function prototypes moved from sockaddr_in to openvpn_sockaddr
+  - several new sockaddr functions needed to "generalize" AF_xxxx operations:
+    addr_copy(), addr_zero(), ...etc
+    proto_is_udp(), proto_is_dgram(), proto_is_net()
+
+* For TODO list, see TODO.IPv6
+
+--
+JuanJo Ciarlante   jjo () google () com ............................
+:                                                                  :
+.                                         Linux IP Aliasing author .
+.   Modular algo (AES et all) support for FreeSWAN/OpenSWAN author .
+.                                        OpenVPN over IPv6 support .
+:......     plus other scattered free software bits in the wild ...: