Update of Container IPv6 Networking

Change-Id: Ib568dc5ba47d0be61dad3cdc0b38368785f4d329
Signed-off-by: BIN HU <bin.hu@att.com>

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diff --git a/docs/release/userguide/icmpv6-and-ndp-proxying-for-docker-containers.rst b/docs/release/userguide/icmpv6-and-ndp-proxying-for-docker-containers.rst
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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+.. (c) Prakash Ramchandran
+
+==============
+ICMPv6 and NDP
+==============
+
+ICMP is a control protocol that is considered to be an integral part of IP,
+although it is architecturally layered upon IP, i.e., it uses IP to carry its
+data end-to-end just as a transport protocol like TCP or UDP does. ICMP
+provides error reporting, congestion reporting, and first-hop gateway
+redirection.
+
+To communicate on its directly-connected network, a host must implement the
+communication protocol used to interface to that network. We call this a link
+layer or media-access layer protocol.
+
+ICMPv6 is used instead of ARP as in IPv4, with following Neighbor Discovery
+Protocol (NDP) options.
+
+NDP defines five ICMPv6 packet types for the purpose of router solicitation,
+router advertisement, neighbor solicitation, neighbor advertisement, and
+network redirects. Refer RFC 122 & 3122.
+
+Contrasting with ARP, NDP includes Neighbor Unreachability Detection (NUD),
+thus, improving robustness of packet delivery in the presence of failing
+routers or links, or mobile nodes. As long as hosts were using single network
+interface, the isolation between local network and remote network was simple.
+With requirements of multihoming for hosts with multiple interfaces and
+multiple destination packet transfers, the complications of maintaining all
+routing to remote gateways has disappeared.
+
+To add container network to local network and IPv6 link local networks and
+virtual or logical routing on hosts, the complexity is now exponential.
+In order to maintain simplicity of end hosts (physical, virtual or containers),
+just maintaining sessions and remote gateways (routers), and maintaining routes
+independent of session state is still desirable for scaling internet connected
+end hosts.
+
+For more details, please refer to [1]_.
+
+-----------------------------------------
+IPv6-only Containers & Using NDP Proxying
+-----------------------------------------
+
+IPv6-only containers will need to fully depend on NDP proxying.
+
+If your Docker host is the only part of an IPv6 subnet but does not have an
+IPv6 subnet assigned, you can use NDP Proxying to connect your containers to
+the internet via IPv6.
+
+If the host with IPv6 address ``2001:db8::c001`` is part of the subnet
+``2001:db8::/64``, and your IaaS provider allows you to configure the IPv6
+addresses ``2001:db8::c000 to 2001:db8::c00f``, your network configuration may
+look like the following:
+
+.. code-block:: bash
+
+    $ ip -6 addr show
+
+    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536
+       inet6 ::1/128 scope host
+          valid_lft forever preferred_lft forever
+    2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qlen 1000
+       inet6 2001:db8::c001/64 scope global
+          valid_lft forever preferred_lft forever
+       inet6 fe80::601:3fff:fea1:9c01/64 scope link
+          valid_lft forever preferred_lft forever
+
+To split up the configurable address range into two subnets
+``2001:db8::c000/125 and 2001:db8::c008/125``, use the following daemon.json
+settings.
+
+.. code-block:: bash
+
+    {
+      "ipv6": true,
+      "fixed-cidr-v6": "2001:db8::c008/125"
+    }
+
+The first subnet will be used by non-Docker processes on the host, and the
+second will be used by Docker.
+
+.. figure:: images/ndp-proxying.png
+   :name: icmpv6-figure1
+   :width: 100%
+
+   Figure: Using NDP Proxying
+
+For more details, please refer to [2]_.
+
+----------
+References
+----------
+
+.. [1] https://en.wikipedia.org/wiki/Neighbor_Discovery_Protocol
+.. [2] https://docs.docker.com/v17.09/engine/userguide/networking/default_network/ipv6/#using-ndp-proxying
+