* added README.ipv6.txt

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+[ Last updated: 17-Sep-2009. ]
+This README covers UDP/IPv6 v0.4.x ( --udp6 and --tcp6-xxxxxx  ) support
+for openvpn-2.1.
+
+Available under GPLv2 from 
+  http://github.com/jjo/openvpn-ipv6
+
+* Working:
+  - tcp6->tcp6; tested on GNU/Linux
+  - upd6->upd6; tested on GNU/Linux
+  - upd4->upd6 (ipv6 bound)
+
+* 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()
+
+* TODO:
+  -  Implement comparison for mapped addesses: server in dual stack
+     listening IPv6 must permit incoming streams from allowed IPv4 peer,
+     currently you need to pass eg:  --remote ffff::1.2.3.4
+
+--
+JuanJo Ciarlante   jjo () google () com
+:                                                                  :
+.                                         Linux IP Aliasing author .
+.   Modular algo (AES et all) support for FreeSWAN/OpenSWAN author .
+:...       plus  other scattered free software bits in the wild ...: