Industrial & OT Security Insights

Firewalls vs Unidirectional Gateways at IT/OT Interfaces

Industrial / OT networks use firewalls extensively, as do enterprise networks, but at IT/OT interfaces, best practice demands at least one layer of unidirectional gateway technology. This advice can be confusing to security practitioners who assume that a unidirectional gateway is some sort of “unidirectional firewall.” In this eBook we define what is a firewall, review firewall principles, introduce unidirectional gateways, and compare the effectiveness of these two network perimeter protection technologies at the IT/OT interface. We conclude that unidirectional gateways are much stronger than firewalls, are simple to deploy, and reduce perimeter protection operating costs quite dramatically at the boundary between control-critical and business-critical networks.

In This eBook

Operating Cost Savings
Vulnerabilities and zero-days
Industrial Networks
wHAT ARE Firewalls
Comparing Security

About The Author

Andrew Ginter

Andrew Ginter

Andrew Ginter is the VP of Industrial Security at Waterfall Security Solutions

At Waterfall, Andrew leads a team of experts who work with the world’s most secure industrial sites. He is author of two books on industrial security, a co-author of the Industrial Internet Consortium’s Security Framework, and the co-host of the Industrial Security Podcast. Andrew spent 35 years designing SCADA system products for Hewlett Packard, IT/OT connectivity products for Agilent Technologies, and OT/ICS security products for Industrial Defender and Waterfall Security Solutions.

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