Josh and Traceroute are the way to go.
I got connected with Josh when I was working at Intuity Medical and we needed OT support to standup a new machine network. Come to find out he was the brainchild of much of the original OT design at Chobani that I maintained and worked very closely with. From helping me architect world class, high uptime, reliable, redundant networks to patiently teaching me how to set up a NAT Device more times than I can count, he is a person you want to have in your toolkit. I've taken his training multiple times and it's one everyone working in the Automation space should attend at some point, you will learn so much. And Josh delivers it with passion that gets you excited about talking through the details of what an IP address truly means. Josh also was instrumental in looking outside of traditional platforms to find me remote IO to satisfy 50+ panels needed in a very short timeline at Redwood. We would not have been able to start these plants up in the time we did if Josh didn't introduce us to ODOT IO. If you ever need any help figuring out a tough communications/networking issue, or need some advice on a new project and how to architect it, or want a full turnkey solution on the OT network side, Josh and Traceroute are the way to go. He has saved me so many times and that resulted in less downtime in whatever factory I was in.
Alicia Lomas, Director of Controls Engineering, Redwood Materials