Working & Types Of Firewall

Replies

• 

  Mahesh Dahale

  Re: Firewall
  
  A firewall is a set of related programs, located at a network gateway server, that protects the resources of a private network from users from other networks.
  
  
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  Check this thread
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• 

  dwarakanathdivya

  Re: Firewall
  
  thank you Mahesh. Mahesh actually i visited the sites (which you have given ) before 1 week only. I want more about it. please send more information about it.
• 

  4M4N

  What is a firewall?
  
  
  A system designed to prevent unauthorized access to or
  from a private network. Firewalls can be implemented
  in both hardware and software, or a combination of both.
  Firewalls are frequently used to prevent unauthorized
  Internet users from accessing private networks connected
  to the Internet, especially intranets. All messages entering
  or leaving the intranet pass through the firewall, which
  examines each message and blocks those that do not meet the
  specified security criteria.
  
  
  There are several types of firewall techniques:
  
  
  1. Packet filter:
  -------------
  
  Looks at each packet entering or leaving
  the network and accepts or rejects it based on user-defined
  rules. Packet filtering is fairly effective and transparent
  to users, but it is difficult to configure. In addition, it
  is susceptible to IP spoofing.
  
  
  2. Application gateway:
  -------------------
  
  Applies security mechanisms to specific
  applications, such as FTP and Telnet servers. This is very
  effective, but can impose a performance degradation.
  
  
  3. Circuit-level gateway:
  -----------------------
  
  Applies security mechanisms when a
  TCP or UDP connection is established. Once the connection has
  been made, packets can flow between the hosts without further
  checking.
  
  
  4. Proxy server:
  ---------------
  
  Intercepts all messages entering and leaving the
  network. The proxy server effectively hides the true
  network addresses
• 

  4M4N

  more info
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• 

  BCA_GIRL

  Nice information!!!!