The difference between traditional security firewalls and digital communication vendor firewalls

Traditional firewall functions: access control functions, often used to achieve the horizontal isolation requirements of industrial control networks. The main function is reflected in

Digital communication vendor firewall function: first of all, the main functions of the traditional firewall, the other most prominent point is the built-in industrial communication protocol filtering module, support for a variety of industrial protocol identification and filtering, to make up for the commercial firewall does not support the shortcomings of the industrial protocol filtering. For example, Dauphiné's industrial firewall supports Honeywell's C200\C300 controller, Honeywell CDA, Honeywell FTE protocols; Siemens' S7-200, S7-1200, S7-300 controller, WINCC, STEP7 software and so on. Deep packet inspection technology and application layer communication tracking technology are adopted for industrial protocols. Able to industrial control network packet depth packet parsing, the current technology is generally parsed to the command layer of the industrial control protocol, which can realize the blocking of illegal commands, non-industrial control protocols to intercept, and play a role in protecting the key controllers.