Performance impact of commercial industrial firewalls on networked control systems

摘要: The connection of control and process networks to company infrastructures the Internet, besides offering undeniable advantages, also imposes adoption adequate security countermeasures. Specialized firewalls, able recognize inspect traffic concerning peculiar communication protocols such as Modbus, which are commonly adopted in industrial applications, beginning spread on market. However, several systems (ICSs) must satisfy critical performance timing requirements impact introducing a kind devices an existing network should be evaluated carefully. In this paper we present simple approach based ordinary equipment open source software, can help system designers managers get approximate but useful information about effects produced by including firewall their system. proposed technique, though quite simple, has advantage circumventing need ad-hoc measurement instrumentation used non-experts, virtually with little or no effort, rough guess indications extent insertion tolerated.