Understanding OT Security and the Benefits of Renting Ruggedized NGFWs

Fu*k, ok, well sorry here i am, fourth coffee in, just coming down from the hardware hacking village at defcon tryign to make sense of the cluster that is OT security today. When I first started out as a network admin in 1993, as long as our voice and data was traversing PSTN we didn’t have much problems, as long as we didn’t get locked into a horrific config. But then there was Slammer worm — you remember that little rat? It taught me early on how quickly things can go south when your security stance isn’t airtight. Now fast forward and I’m running whole cybersecurity programs, such as working recently with three banks that wanted to upgrade their zero trust. But today, we’re going OT — and IIoT for those who like a spicy acronym. In particular, I want to discuss how renting ruggedized next-gen firewalls (NGFWs) for your factory floor PLCs and SCADA systems can make a world of difference.

OT Threat Landscape

If you think OT (Operational technology) is about the aging old rusty work equipment doing its thing, you are mistaken. Today, OT and IIoT gear are also online — and also many vulnerabilities — just like your office desktops were once every desktop in your office was running Windows 95. The problem? The majority of outdated PLCs and SCADA systems were not built considering security in the first place. They’re like vintage cars — beautiful, functional, even iconic — but not crafted to withstand hackers joy-riding through your production lines.

Ransomware attackers have pivoted to OT environments because they represent a ripe target considering that they belong to the critical infrastructure. A compromised PLC does not only represent an IT problem, but also physical safety, potential production downtime and customer trust.

But the thing is: OT networks are special. You can’t just slap traditional IT security tools on them and be done with it. Firewalls designed for office networks can lack the deep inspection functions necessary for industrial protocols — or worse, interfere with real-time operations.

Rugged Firewall Specs: How Tough Is the Smoke for Your Factory Floor?

Add the ruggedized NGFW—firewalls so tough they’re made for rough factory floors but brilliant enough to remain on top of industrial protocols like Modbus, DNP3 and OPC UA.

Here’s what to look for:

• Industrial chassis: Dust, humidity, vibrations—your average datacenter firewall doesn’t do so well here. These are built to last where forklifts roam.
• Extended temperature support: Your factory floor can be warmer than your lap’s a Norseion dance at times.
• Deep protocol understanding: PLCs tend to not talk HTTP/TCP/IP like a normal web server, so the firewall has to be able to understand and manage industrial protocols with ease.
• Low latency: Control systems require speed; latency can lead to process glitches or worse.

Trust me, I’m not feeding you marketing fluff. When I was in the field at a major factory last year using a standard NGFW was causing enough packet delay to stop (albeit temporarily) an assembly line. The hardened version though, coped quite nicely keeping millisecond level latency, controlling threat vectors efficiently as it did.

Deployment Considerations

The thing about deploying these units is this: It’s not like your at home router where you plug it in, and away you go. OT environments require meticulous planning, and the last thing you need is a “security” feature to break important operations.

Key things to keep in mind—

• Segmentation is king. Stomp on lateral movement — if one PLC gets infected, your entire line shouldn’t crash. Industrial firewalls support zoning and micro-segmentation that is specific to OT.
• Compatibility checks: every SCADA and PLC manufacturer comes with some proprietary bullshit. Test your firewall under controlled conditions so you don’t get surprises.
• Training: Your factory floor engineers aren’t firewall engineers. Everyone needs hands-on, jargon-free education.
• Phased rollout: There’s no need to rip and replace. Add as complement by existing security layers, monitor performance section, then deploy.

I’m not going to lie, I’ve seen many well intentioned firewall deployments over the years that blew up the entire network for day(s). It’s frustrating but fixable.

Maintenance in Harsh Environments

You have your hardcore firewall; great. Now what? Your firewall won’t be like standard IT equipment in an air-conditioned rack: it’ll be sitting a dusty room with ladders and god knows what else; or it’ll be in a garage which gets hot and cold several times a year; or it’ll be in a factory and suffer the occasional splashes of whatever industrial fluids the machines near it are using. That means:

• Periodic physical checks to identify damage or an accumulation of dirt.
• You can’t overlook firmware and signature updates. Patch updates to OT are already challenging in the cloud – because most practitioners accept their patch updates later than they should — and OT vendors can be particularly slow to lunge into the cloud. Sometimes manual updates are your friend here.
• Remote management Take the hassle out of downtime especially when you’re in the factory lab or 10 km away on the floor weird shift hours.
• Spare units available: When something does go wrong (because it will), and you’re able to swap out physical units quickly, you may be able to avoid expensive production stoppages.

I mean, I have had a firewall silently fail due to dust jamming up the vent fans — lesson learned.

Cost Comparison: Leased vs Purchased Industrial NGFWs

If you’ve been around the block as many times as I have, you’ve watched companies hemorrhage money on up-front capital costs that go obsolete before they cover themselves, never mind make a profit. Buying ruggedized NGFWs outright means:

• High capital outlay upfront. Those devices aren’t cheap.
• Rapid tech obsolescence. You may wind up with hardware that’s obsolete in a few years.
• It costs money to maintain and support. Not to mention training.

Here’s where renting these industrial firewalls turns the tables:

• OPEX-friendly: Say goodbye to major capex drain. It’s also better for budgeting if you go pay period wise.
• Tech refresh flexibility: Change over to new models as they become available.
• All you can eat support and updates: Typically, rental contracts offer firmware updates and remote management.
• Fast deployment: Many vendors already have units that are ready to be shipped.

Really, attempting to rent industrial NGFWs to secure your OT feels like leasing your car instead of purchasing it. You end up with a new model without having to sweat depreciation or repair costs. Yes, there’ll always be people out there who’d rather own their kit (and the return-on-investment don’t lie!) but that’s often not what the industry resale numbers say.

Quick Take

• OT and IIoT are in the crosshairs — legacy PLCs literally make for fish in a barrel without suitable security.
• Industrial NGFWs: They don’t just talk to anything.
• Deploying them requires planning — it’s not plug and play.
• Routine upkeep in harsh factory environment is no option.
• Leasing this equipment takes the strain of your cashflow and will future-proof your security position.

Closing Thoughts

All this long windedness is my way of saying—if you’re still filling OT security gaps with IT grade firewalls or only expecting network segmentation without deep inspection to protect your ICS* then you’re off-road in a Formula 1. The factory floor calls for and demands specialized security gear — and operational flexibility. By renting ruggedized NGFWs you can not only help secure your PLCs and SCADA, but also sleep better at night and get more glow without CAPEX revved hangovers.

I have to confess, before then, I was a little wary of anyone promising OT security that was also going to be a cinch to implement—that was a hype, I thought. But after years in the trenches and yes, some spectacular screw-ups along the way, I’m a believer: renting industrial firewalls is a good play. The one thing I am still not buying is these vaccinations, so to speak, of the so-called A.I. magic firewalls. Because seriously: If your firewall is selling you on buzzwords rather than substance, that’s nothing but fancy smoke and mirrors.

Anyway, enough ranting. So it’s time to pour yourself that fourth coffee. Be safe out there on your OT frontlines.