![]() ![]() ![]() Technology developed during the 1990s made it so that the firewall became able to monitor the communication between specific hosts on either side of the firewall – known as stateful filters. Since TCP operates a convention of using well know port numbers for certain services (HTTP is on port 80 for example) then the firewall could block access to an FTP server by not accepting traffic incoming for FTP’s well-known port 21. The original firewalls were simple packet filters and able only to manage connections based on TCP/IP port numbers and IP addresses. How do firewalls work?įirst created in the late 1980s, a firewall is a device that limits the communication between two different networks (or network segments). This article will explain how a traditional firewall works, how so-called next generation firewalls generally differ and how the new capabilities these devices bring can enhance your network security. However, the definition of precise capabilities required to call a firewall next generation (or not) are far from universally agreed. The phrase ‘next generation firewall’ is increasingly being used by security vendors to describe their network security products. What is a Next Generation Firewall and how can it help keep your network secure?
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