The firewall maintains an access control list which dictates what packets will be looked at and what action should be applied, if any, with the default action set to silent discard. The first reported type of network firewall is called a packet filter, which inspects packets transferred between computers. Types Īn illustration of a network-based firewall within a network Packet filter īefore it was used in real-life computing, the term appeared in the 1983 computer-hacking movie WarGames, and possibly inspired its later use.
Because they already segregated networks, routers could apply filtering to packets crossing them. The predecessors to firewalls for network security were routers used in the late 1980s. The term was applied in the late 1980s to network technology that emerged when the Internet was fairly new in terms of its global use and connectivity. Later uses refer to similar structures, such as the metal sheet separating the engine compartment of a vehicle or aircraft from the passenger compartment. The term firewall originally referred to a wall intended to confine a fire within a line of adjacent buildings. A firewall typically establishes a barrier between a trusted network and an untrusted network, such as the Internet.
In computing, a firewall is a network security system that monitors and controls incoming and outgoing network traffic based on predetermined security rules.
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