UNDERSTANDING FIREWALL TECHNOLOGY FOR INDUSTRIAL CYBERSECURITY PART 2
Dr Tobias Heer, Dr Oliver Kleineberg and Divij Agarwal*
By combining different firewall functions in an overall network defence strategy it is possible to design networks that are prepared for the future.
I
n Part 1 of this article we discussed the general functions of a security firewall, and its placement within, and at the boundaries of, an industrial network. Once the required locations of firewalls have been determined, the type of filtering and the ongoing management of the firewalls needs to be considered.
Security in other network infrastructure As part of Defence in Depth, it is useful to restrict communication to the desired patterns and communication relationships at all other points in the network. Because firewalls introduce transmission latency (delay in transmission) and reduce network throughput, the use of a dedicated firewall may not be feasible
14 PROCESS TECHNOLOGY - JULY 2022
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