Next-Generation Firewalls
The humble firewall has come a long way since the packet-filtering days, originally founded in the 1980's. These early firewalls operated mainly on the first four layers of the OSI model, intercepting traffic and inspecting the properties of every packet to determine if they matched a pre-configured set of rules. Firewall development did not take a breather between then and the next-generation firewall of today. In fact, the ride from there to here has been largely organic – developments in firewall technology, intrusion detection and prevention, and user or content management have all been assimilated into the unified threat management (UTM) platform of today.