![]() ![]() This is achieved by utilizing advanced iptables features that allow for dynamic inspection of packet data. We propose and demonstrate a novel methodology to use iptables as an effective firewall for SCADA systems. In general, use of iptables as a network-level firewall for SCADA systems has been limited to basic port and host filtering, without further inspection of control messages. Iptables is a powerful open-source firewall solution available as part of most Linux distributions in use today. ![]() In this research we investigate the major open-source firewalls for their use in SCADA networks and identify Linux iptables’ potential as an effective SCADA firewall. Although open-source firewalls are used successfully in IT networks, their use in SCADA networks has not been properly investigated. Several commercial vendors have extended their firewall capabilities to support SCADA protocols or designed SCADA-specific firewalls. ![]() They help secure it by blocking unwanted traffic from entering or leaving the protected network. Firewalls are one of the most widely used security devices to protect a communications network.
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