The convergence of IT and industrial automation networks has created great opportunities, but with this comes increased security threats from hackers, worms, and viruses. Clearly, remote utility network administrators must rethink their approach to network security. Ethernet networks have proliferated across many of our workplaces today; that includes utilities such as pumping stations, electrical substations, and oil pumping wells. Initial implementation of Ethernet networks at pumping stations disregarded security measures since most of these networks did not have external network access (i.e. connection to the public internet). However, this safety is in fact illusory. However safe that it may seem, it turns out to be just the opposite. Studies have now shown that most attacks (83%*) occur from within the intranet, and not from external internet connections. Further, PLCs and RTUs distributed within the network are not designed to support traditional firewall and anti-virus software protection such as would be used in an IT network.
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