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Published in:
2010 | OriginalPaper | Chapter
Application Filters for TCP/IP Industrial Automation Protocols
Authors : Aguinaldo B. Batista Jr., Tiago H. Kobayashi, João Paulo S. Medeiros, Agostinho M. Brito Jr., Paulo S. Motta Pires
Published in: Critical Information Infrastructures Security
Publisher: Springer Berlin Heidelberg
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The use of firewalls is a common approach usually meant to secure Automation Technology (AT) from Information Technology (TI) networks. This work proposes a filtering system for TCP/IP-based automation networks in which only certain kind of industrial traffic is permitted. All network traffic which does not conform with a proper industrial protocol pattern or with specific rules for its actions is supposed to be abnormal and must be blocked. As a case study, we developed a seventh layer firewall application with the ability of blocking spurious traffic, using an IP packet queueing engine and a regular expression library.