Improving and defending our nation\u27s critical infrastructure has been a challenge for quite some time. A malfunctioning or stoppage of any one of these systems could result in hazardous conditions on its supporting populace leading to widespread damage, injury, and even death. The protection of such systems has been mandated by the Office of the President of the United States of America in Presidential Policy Directive Order 21. Current research now focuses on securing and improving the management and efficiency of Industrial Control Systems (ICS). IIoT promises a solution in enhancement of efficiency in ICS. However, the presence of IIoT can be a security concern, forcing ICS processes to rely on network based devices for process management. In this research, the attack surface of a testbed is evaluated using protocol-agnostic attacks and the SANS ICS Cyber Kill Chain. This highlights the widening of ICS attack surface due to reliance on IIoT, but also provides a solution which demonstrates one technique an ICS can use to securely rely on IIoT
