NAT - Network Address Translation
==================================

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        **What is NAT?**

        NAT (Network Address Translation) is a method used by routers to translate private IP addresses to a public
        IP address (and vice versa) for internet communication.

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        **Why is NAT used?**

        NAT helps conserve public IP addresses and adds a layer of security by hiding internal network structures.

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        **What are the types of NAT?**

        Common types include Static NAT, Dynamic NAT, and PAT (Port Address Translation, also called NAT Overload).

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        **What is Static NAT?**

        Maps one private IP address to one public IP address. Used when a device needs to be consistently reachable from the internet.

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        **What is Dynamic NAT?**

        Maps a private IP to any available public IP from a pool. The mapping changes over time.

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        **Does NAT provide security?**

        Yes, to some extent. It hides internal IP addresses from external networks, reducing direct attack surfaces.

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        **Is NAT used in IPv6?**

        Generally no. IPv6 has a vast address space, eliminating the need for NAT.

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        **Where is NAT configured?**

        NAT is typically configured on routers or firewalls at the network edge.


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        Topics in this section,

                * :ref:`Learnings in this section <NAT_step1>`

                * :ref:`Terminology <NAT_step2>`

                * :ref:`Version Info <NAT_step3>`

                * :ref:`NAT Version&RFC Details <NAT_step5>`

                * :ref:`NAT Basic Setup on Ubuntu using IPv4 <NAT_step16>`

                * :ref:`NAT Basic Setup on Ubuntu using IPv6 <NAT_step17>`

                * :ref:`NAT Usecases <NAT_step6>`

                * :ref:`NAT Basic Features <NAT_step7>`
                    
                * :ref:`NAT Feature : IP Address Translation <NAT_step8>` 

                * :ref:`NAT Feature : Port Address Translation (PAT) <NAT_step9>`

                * :ref:`NAT Feature : Conserves IPv4 Addresses <NAT_step10>`  

                * :ref:`NAT Feature : Enhances Network Security <NAT_step11>`  

                * :ref:`NAT Feature : Supports Multiple NAT Types <NAT_step12>`

                * :ref:`NAT Feature : Protocol-Aware Behavior <NAT_step13>`

                * :ref:`NAT Feature : Enables Internet Access for Private Networks <NAT_step14>`   

                * :ref:`Reference links <NAT_step15>`


.. _NAT_step1:

.. tab-set::

    .. tab-item:: Learnings in this section

        * In this section, you are going to learn

.. _NAT_step2:

.. tab-set::

    .. tab-item:: Terminology
        
       * Terminology


.. _NAT_step3:

.. tab-set::

    .. tab-item:: Version Info
    
         * Version Info
.. _NAT_step5:

.. tab-set::

    .. tab-item:: NAT Version&RFC Details

        
         .. csv-table:: 
               :file: ./NAT/NAT_Version_RFC_details.csv
               :widths: 10,10,10,30
               :header-rows: 1

.. _NAT_step16:

.. tab-set::

    .. tab-item:: NAT Basic Setup on Ubuntu using IPv4

       * Setup


.. _NAT_step17:

.. tab-set::

    .. tab-item:: NAT Basic Setup on Ubuntu using IPv6
       
       * Setup



.. _NAT_step6:

.. tab-set::

    .. tab-item:: NAT Usecases
        
        
         .. csv-table:: 
               :file: ./NAT/NAT_Use_Cases.csv
               :widths: 10,20,30
               :header-rows: 1

.. _NAT_step7:

.. tab-set::

    .. tab-item:: NAT Basic Features
    
         
         .. csv-table:: 
                  :file: ./NAT/NAT_Basic_Features.csv
                  :widths: 10,10,30
                  :header-rows: 1

.. _NAT_step8:

.. tab-set::

    .. tab-item:: NAT Feature : IP Address Translation

          **IP Address Translation - Testcases**

          .. csv-table:: 
                 :file: ./NAT/NAT_Feature1_IP_Address_Translation_TestCases.csv
                 :widths: 10,10,30,20
                 :header-rows: 1


   
.. _NAT_step9:

.. tab-set::

    .. tab-item:: NAT Feature : Port Address Translation (PAT)

         **Port Address Translation (PAT) - Testcases**

         .. csv-table:: 
                :file: ./NAT/NAT_Feature2_Port_Address_Translation_PAT_TestCases.csv
                :widths: 10,10,30,20
                :header-rows: 1


.. _NAT_step10:

.. tab-set::

    .. tab-item:: NAT Feature : Conserves IPv4 Addresses

        **Conserves IPv4 Addresses - Testcases**

        .. csv-table:: 
                 :file: ./NAT/NAT_Feature3_Conserves_IPv4_Addresses_TestCases.csv
                 :widths: 10,10,30,20
                 :header-rows: 1


.. _NAT_step11:

.. tab-set::

    .. tab-item:: NAT Feature : Enhances Network Security

          **Enhances Network Security - Testcases**

          .. csv-table:: 
                :file: ./NAT/NAT_Feature4_Enhances_Network_Security_TestCases.csv
                :widths: 10,10,30,20
                :header-rows: 1



.. _NAT_step12:

.. tab-set::

    .. tab-item:: NAT Feature : Supports Multiple NAT Types

         **Supports Multiple NAT Types - Testcases**

         .. csv-table:: 
                 :file: ./NAT/NAT_Feature5_Supports_Multiple_NAT_Types_TestCases.csv
                 :widths: 10,10,30,20
                 :header-rows: 1


 
.. _NAT_step13:

.. tab-set::

    .. tab-item:: NAT Feature : Protocol-Aware Behavior

         **Protocol-Aware Behavior - Testcases**

         .. csv-table:: 
                  :file: ./NAT/NAT_Feature6_Protocol_Aware_Behavior_TestCases.csv
                  :widths: 10,10,30,20
                  :header-rows: 1


.. _NAT_step14:

.. tab-set::

    .. tab-item:: NAT Feature : Enables Internet Access for Private Networks
   
          **Enables Internet Access for Private Networks - Testcases**

          .. csv-table:: 
                 :file: ./NAT/NAT_Feature7_Enables_Internet_Access_for_Private_Networks_TestCases.csv
                 :widths: 10,10,30,20
                 :header-rows: 1



.. _NAT_step15:

.. tab-set::

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