PROXY SERVER

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PROXY SERVER

• Kalyani
  Ravi

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• A proxy server is essentially an electronic
  gatekeeper, residing between an organization's
  internal network and the Internet, controlling
  the flow of information between the two.
• The three basic functions of a proxy server are
  
  
• IP-Masking
• Data Caching
• Access Control

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IP-Masking

• IP-address masking is a technique whereby a proxy
  server tricks other computer on the Internet into
  thinking that it is the only machine receiving or
  requesting information from an institution .
• Proxy server acts like middle
  man between an internal network and the internet,
  all requests for information are channeled
  through the proxy server which places the
  requests on behalf of user computers. Therefore
  proxy servers is only seen by other computers on
  the internet and masks the IP address of the
  internal computer networks.

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• As everything from or to internal network passes
  through proxy server it increases network
  security and user productivity by filtering
  content.
• Proxy servers limits access to
  objectionable content like viruses and HTML tags
  at the internet gateway by filtering URLs.
• proxy servers restrict unauthorized
  access to the internal network by authenticating
  users

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Proxy Caching

• Proxy Server caches frequently accessed documents
  automatically and requests data from its source
  only when that source has been updated or has
  expired, which reduces network traffic and gives
  users access to fresh content without the wait.
  Documents or entire sites can be preloaded into
  the cache, and administrators can schedule
  updates of cached content. Whole sites can be
  downloaded during low-traffic periods, for
  example, so they're fresh when users need them.
  Thereby reducing network traffic on intranet and
  improve response time for users.

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Access Control

• a proxy server provides institutions with an
  effective tool to provide access to remote users.
  
• An off-site (or off-campus) user
  connects to the Internet via an ISP and wants to
  connect to an IP-restricted resource. If the user
  were to connect to the resource directly, they
  would be denied access because their IP-address
  didn't match that of the subscribing institution.
  However, if the user were to connect to the
  institution's proxy server and validate
  themselves, the proxy server would then handle
  the flow of information between the user and the
  resource provider (masking the user's
  IP-address). As a result, the resource would see
  the proxy server's IP-address as valid and
  provide access

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