Transparent Proxy 
=====================

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        **What is Transparent Proxy?**

        A Transparent Proxy is a type of proxy server that intercepts client traffic without any configuration on the client side. It operates invisibly, meaning users are often unaware that their traffic is being routed through a proxy.

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        **Why is Transparent Proxy useful?**

        * Allows **monitoring and filtering** of web traffic without user intervention.
        * Useful for **content caching** to improve performance.
        * Enforces **network policies** like URL blocking or access restrictions.
        * Seamless integration — no need to manually configure proxy settings on client devices.
        * Ideal for **schools**, **businesses**, and **ISPs** wanting control over user traffic.

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        **How it works?**

        * A router or firewall intercepts outgoing traffic (e.g., HTTP) and redirects it to the proxy server.
        * The proxy processes the request (e.g., logging, filtering, caching).
        * The proxy then forwards the request to the target server or blocks it.
        * The response is returned to the client, often without the client knowing it passed through a proxy.

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        **Where is Transparent Proxy used?**

        * In **enterprise networks** to monitor employee internet usage.
        * In **educational institutions** for filtering inappropriate content.
        * By **ISPs** to manage bandwidth or enforce usage policies.
        * In **public Wi-Fi networks** to redirect users to captive portals or landing pages.

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

        * Transparent proxies operate at the **Application Layer (Layer 7)** of the OSI model.
        * However, they often rely on **Layer 3/4 (Network/Transport)** redirection via routers or firewalls.

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        **IS Transparent Proxy windows specific?**

        * No, Transparent Proxies are **not Windows-specific**.
        * They can be deployed on various platforms including Windows, Linux, and embedded network devices.

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        **IS Transparent Proxy Linux Specific?**

        * No, although **many open-source transparent proxy solutions (like Squid)** are widely used on Linux, the concept itself is platform-agnostic.

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        **Which Transport Protocol is used by Transparent Proxy?**

        * Transparent proxies primarily handle **TCP** traffic (especially HTTP/HTTPS).
        * Some implementations can handle **UDP**, but it is less common.

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        **Which Port is used by Transparent Proxy?**

        * Typically intercepts traffic on:
          * **Port 80** (HTTP)
          * **Port 443** (HTTPS)
        * The actual proxy may listen on **custom internal ports** like 3128 or 8080.

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        **Is Transparent Proxy using Client server model?**

        * Yes, it follows the **client-server model**, even if the client is unaware.
        * The client makes a request; the proxy server acts as the intermediary to fulfill or block the request based on rules.

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        Topics in this section,

                * :ref:`Learnings in this section <Transparent_step1>`

                * :ref:`Terminology <Transparent_step2>`

                * :ref:`Version Info <Transparent_step3>`

                * :ref:`Transparent Version&IEEE Details <Transparent_step5>`

                * :ref:`Transparent Basic Setup on Ubuntu using IPv4 <Transparent_step18>`

                * :ref:`Transparent Basic Setup on Ubuntu using IPv6 <Transparent_step19>`

                * :ref:`Transparent Protocol Packet Details <Transparent_step6>`

                * :ref:`Transparent Usecases <Transparent_step7>`

                * :ref:`Transparent Basic Features <Transparent_step8>`
                    
                * :ref:`Reference links <Transparent_step17>`


.. _Transparent_step1:

.. tab-set::

    .. tab-item:: Learnings in this section

        * In this section, you are going to learn

.. _Transparent_step2:

.. tab-set::

    .. tab-item:: Terminology
        
       * Terminology


.. _Transparent_step3:

.. tab-set::

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


.. _Transparent_step5:

.. tab-set::

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

        * rfc details

.. _Transparent_step18:

.. tab-set::

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

       * setup

.. _Transparent_step19:

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

     * setup
       
.. _Transparent_step6:

.. tab-set::

    .. tab-item:: Transparent Protocol Packet Details

        * packet details
       


.. _Transparent_step7:

.. tab-set::

    .. tab-item:: Transparent Usecases

       * usecases
        
        

.. _Transparent_step8:

.. tab-set::

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



.. _Transparent_step17:

.. tab-set::

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