Neighbour Discovery
========================

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        **What is IPv6 Neighbour Discovery?**

        IPv6 Neighbour Discovery (ND or NDP) is a protocol that replaces ARP in IPv4. It is used for discovering other devices on the link, determining their link-layer addresses, finding routers, and maintaining reachability information.

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        **Why is IPv6 Neighbour Discovery useful?**

        It improves network efficiency and security by combining multiple functions like router discovery, prefix discovery, and address resolution into a single, robust protocol.

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        **How does IPv6 Neighbour Discovery work?**

        NDP operates using **ICMPv6 messages** (such as Router Solicitation, Router Advertisement, Neighbor Solicitation, and Neighbor Advertisement). Devices use these to discover and communicate with neighbors and routers on the local link.

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        **Where is IPv6 Neighbour Discovery used?**

        It is used in all IPv6-enabled networks for local communication, auto-configuration, and route discovery — including enterprise LANs, ISPs, and home networks.

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        **Which OSI layer does IPv6 Neighbour Discovery belong to?**

        Neighbour Discovery operates at the **Network Layer (Layer 3)** and interacts closely with Layer 2 (Data Link Layer) for address resolution.

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        **Is IPv6 Neighbour Discovery Windows specific?**

        No, it is implemented across all major operating systems including Windows as part of standard IPv6 support.

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        **Is IPv6 Neighbour Discovery Linux specific?**

        No, Linux fully supports Neighbour Discovery as part of its IPv6 stack, with tools like `ip -6 neigh` and kernel-level support.

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        **Which Transport Protocol is used by IPv6 Neighbour Discovery?**

        Neighbour Discovery uses **ICMPv6**, not a transport protocol like TCP or UDP, but a control protocol for network layer messaging.

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        **Is IPv6 Neighbour Discovery using client-server model?**

        No, it uses a **peer-to-peer model** where nodes communicate directly on the local link to discover neighbors and routers.


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        Topics in this section,

                * :ref:`Learnings in this section <Neighbour_Discovery_step1>`

                * :ref:`Terminology <Neighbour_Discovery_step2>`

                * :ref:`Version Info <Neighbour_Discovery_step3>`

                * :ref:`Neighbour Discovery Basic Setup on Ubuntu using IPv6 <Neighbour_Discovery_step18>`
                
                * :ref:`Reference links <Neighbour_Discovery_step17>`

.. _Neighbour_Discovery_step1:

.. tab-set::

    .. tab-item:: Learnings in this section

        * In this section, you are going to learn

.. _Neighbour_Discovery_step2:

.. tab-set::

    .. tab-item:: Terminology
        
       * Terminology


.. _Neighbour_Discovery_step3:

.. tab-set::

    .. tab-item:: Version Info
    
         * Version Info


.. _Neighbour_Discovery_step18:

.. tab-set::

   .. tab-item:: Neighbour Discovery  Basic Setup on Ubuntu using IPv6

     * setup

.. _Neighbour_Discovery_step17:

.. tab-set::

    .. tab-item:: Reference links
     
       * Reference links