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  1. 1. FIREWALL S.Sivarama Sarma Network Administrator
  2. 2. A firewall is a system that is set up to control traffic flow between two networks. Firewalls are most commonly specially configured Unix systems, but firewalls have also been built out of many other systems, including systems designed specifically for use as firewalls. The most common commercial firewall today is CheckPoint FireWall-1, but competitors such as Cisco's PIX are quickly catching up on CheckPoint.
  3. 3. TYPES OF FIREWALLS <ul><li>The Packet Filtering Firewall </li></ul><ul><li>The Applications-Proxy Firewall </li></ul><ul><li>The Application Gateway Firewall </li></ul><ul><li>The Socks Firewall </li></ul>
  4. 4. The Packet Filtering Firewall <ul><li>In a packet filtering firewall, the firewall examines five characteristics of a packet : </li></ul><ul><li>Source IP address </li></ul><ul><li>Source port </li></ul><ul><li>Destination IP address </li></ul><ul><li>Destination port </li></ul><ul><li>IP protocol ( TCP or UDP ) </li></ul>