Packet filtering firewall are quick and convenient, but not foolproof. If the packet fails this firewall type’s set criteria, it is dropped and unable to pass into the network. The firewall takes apart the information located in the packet header such as IP address and port number to see if the packet is allowed/safe for the network. Types of firewalls that scan packet headers and compare them to Access Control Lists, or ACLs, set forth by a networks security team are referred to as packet filters. The kinds of firewall technology currently on the market: packet filtering, circuit-level gateway, stateful inspection, application-level gateway, multilayer inspection, and UTM. This post reviews two primary firewall types - basic traffic scanning devices and interactive layer-inspecting machines. Many clients know some type of firewall is necessary for a well-rounded network security system, but don’t know how these integral tools of the trade work. Since their inception in the late 1980’s, the types of firewalls available have evolved drastically to combat increasingly sophisticated attacks on computer networks.
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