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Firewalls are one of the most widely used security devices to protect a communications network. They help secure it by blocking unwanted traffic from entering or leaving the protected network. Several commercial vendors have extended their firewall capabilities to support SCADA protocols or designed SCADA-specific firewalls. Although open-source firewalls are used successfully in IT networks, their use in SCADA networks has not been properly investigated. Iptables is a powerful open-source firewall solution available as part of most Linux distributions in use fwsnort drop valve. In general, use of iptables as a network-level firewall for SCADA systems has been limited to basic port and host fwsnort drop valve, without further fwsnort drop valve of control messages. We propose and demonstrate a novel methodology to use iptables as an effective firewall for SCADA systems. This is achieved by utilizing advanced iptables features that allow for dynamic inspection of packet data. The approach has been tested by defining filtering rules for the Modbus TCP protocol and validating its ability to defend against various attacks on the protocol. Information Security Journal: A Global Perspective. Volume 25. Nivethan Tandy School of Computer Science, University of Tulsa, Tulsa, Fwsnort drop valve, USA Correspondence nivethan utulsa. Published online: 29 Apr ABSTRACT Firewalls are one of the most widely used security devices to protect a communications network.



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On the use of open-source firewalls in ICS/SCADA systems: Information Security Journal: A Global Perspective: Vol 25, No
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