In relation to my previous post regarding the ransomware disruption to an OT system, this article was published by Palo Alto in 2014 describing ISA 62443 as the 'Gold Standard' for network segmentation. The guidance is and has been available, but we need to keep communicating and educating to ensure this type of information continues to flow to those who may feel overwhelmed on where to start. Start with high-reward, low-effort changes like segmentation between Business/ICS networks and data flow restrictions between zones.
Full article here: https://blog.paloaltonetworks.com/2014/04/iec-62443-new-gold-standard-network-segmentation-ics-and-scada-networks/
