TCP Reverse Proxy - Transmission Control Protocol Reverse Proxy
==================================================================

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        **What is TCP Reverse Proxy?**

        A **TCP Reverse Proxy** is a server that receives TCP connection requests from clients and forwards them to backend servers, acting as an intermediary at the TCP transport layer.

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        **Why is TCP Reverse Proxy useful?**

        TCP Reverse Proxies are useful for:
        - **Load balancing** TCP-based services
        - **Offloading connection management** from backend servers
        - **Security**, by hiding backend servers from clients
        - **Failover and high availability**
        - **Traffic inspection** and **rate limiting** at the TCP level

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        **How it works?**

        - The client initiates a TCP connection to the reverse proxy.
        - The proxy accepts and forwards TCP packets to the backend server.
        - It manages and proxies TCP streams transparently without inspecting application data.
        - Examples: HAProxy, NGINX (stream module), Envoy.

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        **Where is TCP Reverse Proxy used?**

        TCP Reverse Proxies are used in:
        - Proxying databases like MySQL, PostgreSQL
        - Email servers (SMTP), FTP servers
        - Load balancing custom TCP protocols
        - IoT and legacy system integrations

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        **Which OSI layer does this protocol belong to?**

        TCP Reverse Proxy operates at the **Transport Layer (Layer 4)** of the OSI model.

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        **Is TCP Reverse Proxy Windows specific?**

        No, TCP Reverse Proxies are **not Windows specific** and can run on multiple operating systems.

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        **Is TCP Reverse Proxy Linux specific?**

        No, TCP Reverse Proxies are **not Linux specific** though Linux is a common deployment platform.

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        **Which Transport Protocol is used by TCP Reverse Proxy?**

        TCP Reverse Proxy uses:
        - **TCP (Transmission Control Protocol)**

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        **Which Port is used by TCP Reverse Proxy?**

        - Any configured TCP port depending on backend services.
        - Examples: 3306 (MySQL), 25 (SMTP), or custom ports.

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        **Is TCP Reverse Proxy using Client server model?**

        Yes, it follows the **client-server model**:
        - Acts as a **server** to the client
        - Acts as a **client** to the backend servers

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        Topics in this section,

                * :ref:`Learnings in this section <TCP_Reverse_Proxy_step1>`

                * :ref:`Terminology <TCP_Reverse_Proxy_step2>`

                * :ref:`Version Info <TCP_Reverse_Proxy_step3>`

                * :ref:`TCP_Reverse_Proxy Version&IEEE Details <TCP_Reverse_Proxy_step5>`

                * :ref:`TCP_Reverse_Proxy Basic Setup on Ubuntu using IPv4 <TCP_Reverse_Proxy_step18>`

                * :ref:`TCP_Reverse_Proxy Basic Setup on Ubuntu using IPv6 <TCP_Reverse_Proxy_step19>`

                * :ref:`TCP_Reverse_Proxy Protocol Packet Details <TCP_Reverse_Proxy_step6>`

                * :ref:`TCP_Reverse_Proxy Usecases <TCP_Reverse_Proxy_step7>`

                * :ref:`TCP_Reverse_Proxy Basic Features <TCP_Reverse_Proxy_step8>`
                    
                * :ref:`Reference links <TCP_Reverse_Proxy_step17>`


.. _TCP_Reverse_Proxy_step1:

.. tab-set::

    .. tab-item:: Learnings in this section

        * In this section, you are going to learn

.. _TCP_Reverse_Proxy_step2:

.. tab-set::

    .. tab-item:: Terminology
        
       * Terminology


.. _TCP_Reverse_Proxy_step3:

.. tab-set::

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


.. _TCP_Reverse_Proxy_step5:

.. tab-set::

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

        * rfc details

.. _TCP_Reverse_Proxy_step18:

.. tab-set::

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

       * setup

.. _TCP_Reverse_Proxy_step19:

.. tab-set::
  
   .. tab-item:: TCP_Reverse_Proxy Basic Setup on Ubuntu using IPv6

     * setup
       
.. _TCP_Reverse_Proxy_step6:

.. tab-set::

    .. tab-item:: TCP_Reverse_Proxy Protocol Packet Details

        * packet details
       


.. _TCP_Reverse_Proxy_step7:

.. tab-set::

    .. tab-item:: TCP_Reverse_Proxy Usecases

       * usecases
        
        

.. _TCP_Reverse_Proxy_step8:

.. tab-set::

    .. tab-item:: TCP_Reverse_Proxy Basic Features
    
        * features 



.. _TCP_Reverse_Proxy_step17:

.. tab-set::

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