Merge branch 'bug/There-are-two-different-notifications-#5794' into develop

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+Since 2.3.0, OpenVPN officially supports IPv6, and all widely used
+patches floating around for older versions have been integrated.
+
+IPv6 payload support
+--------------------
+
+This is for "IPv6 inside OpenVPN", with server-pushed IPv6 configuration
+on the client, and support for IPv6 configuration on the tun/tap interface
+from within the openvpn config.
+
+The code in 2.3.0 supersedes the IPv6 payload patches from Gert Doering,
+formerly located at http://www.greenie.net/ipv6/openvpn.html
+
+
+The following options have been added to handle IPv6 configuration,
+analogous to their IPv4 counterparts (--server <-> --server-ipv6, etc.)
+
+     - server-ipv6
+     - ifconfig-ipv6
+     - ifconfig-ipv6-pool
+     - ifconfig-ipv6-push
+     - route-ipv6
+     - iroute-ipv6
+
+see "man openvpn" for details how they are used.
+
+
+
+IPv6 transport support
+----------------------
+
+This is to enable OpenVPN peers or client/servers to talk to each other
+over an IPv6 network ("OpenVPN over IPv6").
+
+The code in 2.3.0 supersedes the IPv6 transport patches from JuanJo Ciarlante,
+formerly located at http://github.com/jjo/openvpn-ipv6
+
+OpenVPN 2.4.0 includes a big overhaul of the IPv6 transport patches
+originally implemented for the Android client (ics-openvpn)
+
+IPv4/IPv6 transport is automatically is selected when resolving addresses.
+Use a 6 or 4 suffix to force IPv6/IPv4:
+
+  --proto udp6
+  --proto tcp4
+  --proto tcp6-client
+  --proto tcp4-server
+  --proto tcp6 --client / --proto tcp6 --server
+
+On systems that allow IPv4 connections on IPv6 sockets
+(all systems supporting IPV6_V6ONLY setsockopt), an OpenVPN server can
+handle IPv4 connections on the IPv6 socket as well, making it a true
+dual-stacked server. Use bind ipv6only to disable this behaviour.
+
+On other systems, as of 2.3.0, you need to run separate server instances
+for IPv4 and IPv6.