--- title: "OT Cybersecurity visibility tools: How to operationalise Claroty, Armis, Dragos or Nozomi" description: You bought an OT visibility platform. Here is how to turn Claroty, Armis, Dragos or Nozomi data into owned processes, measurable risk reduction and a funded program. 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PICSEL is the OT cyber risk program platform that co-ordinates everything that needs to happen outside of the basic tool configuration - to realise the full value of the product ## Which product should I buy? This is the one answer I'm not going to provide you in this article - because the reality is - it depends.  All of these tools have great capabilities, but it's not a matter of choosing the right tool - it's about operationalising it effectively, something that must start well before you place your purchase order. ## Before you buy a product The biggest pitfall in OT cybersecurity programs is when Cyber leaders (the usual stakeholders who run these programs) don't engage with the OT stakeholders.  The OT stakeholders are the owners of the OT assets, and the OT assets are running your organisation's core business!  If you buy a product, and turn up to the factory with a box under your arm insisting on putting it in, you'll be invited to leave before you can say Purdue model! Fortunately, the actual steps are pretty straightforward and allow you turn a potential adversary into an ally for the program. #### 1. Learn about the OT world Your role here is to protect OT, not to force another team to tick your compliance boxes.  They are busy trying to run the plants safely, so creating extra work without discussing the value to them is going to be a non-starter.  Instead, ask to learn about their priorities, invite them to share how a cyberattacker could target their facilities, and show them some of the operational benefits they could realise with this new tooling (asset inventory, tracking end-of-life devices, identifying hidden outside connections). #### 2. Recognise operational constraints In the world of OT, there's no problem so bad that you can't do something to make that problem even worse.  Understanding operational constraints - particularly when they are critical paths towards safety and production - will help give more context to your activities and how the program needs to be conducted in order not to cause any operational disruption. #### 3. Plan and own the program jointly A well-engaged OT stakeholder is like gold for your program - they end up becoming part of your team.  So make sure your objectives aren't just cyber-related.  There are many operational benefits you can realise from having real-time asset visibility of the live environment - and a wishlist of capabilities from your OT stakeholders can turn them into motivated partners to deliver this new capability. ## The common pattern after go-live OT visibility platforms are good at what they do: passively discovering assets, mapping communications, flagging vulnerabilities and detecting suspicious behaviour. The trouble usually starts after the sensors are installed and that data starts appearing: - The asset inventory is impressive, but untuned data often has limited value. - Alerts go to an IT security team that lacks process context, or to site staff who lack time. - Vulnerability lists run into the thousands, and most items cannot be patched without a shutdown. - Each site looks different, so leadership cannot tell whether the investment is reducing risk. None of this is a product failure. It is an operating model gap. The tool produces data; the organisation needs to turn that data into decisions.  This requires tuning, triage, and operationalisation. ## Step 1: Confirm coverage before you trust the data Check what the tool can actually see at each site. List the network segments monitored and those that are not, such as serial networks, wireless links, remote sites without sensors, or switches without SPAN capacity. Record known blind spots so reports state their limits honestly. Plan sensor or collection changes as part of the program, not as an afterthought.  Ensure you go beyond just passive network spans - these are limited to what can be seen on the wire, when there are a multitude of other data collection methods that can enrich passive network taps and give you a more accurate picture of the landscape.  Ensure this is done in partnership with asset owners - particularly when it comes to active scanning (best conducted during planned maintenance windows) ## Step 2: Make the asset inventory an owned record Decide who owns asset data at each site, usually a control systems engineer or OT lead, and what “accurate” means. A practical standard is that every asset has a site, zone, function, criticality and owner. Enrich the tool's discovered data with that business context, either in the platform itself or in a system that links to it. Set a regular review, for example monthly at first, where new or unknown assets are identified and either explained or investigated.  Ensure every one of these sessions delivers value and doesn't become an extra meeting that feels more like an obligation. ## Step 3: Define who handles alerts, and how Write an alert-handling model that covers: - **Triage:** who looks at alerts first (a SOC, an MSSP or an internal team) and what OT context they need. - **Escalation:** when and how site operations are contacted, and who can authorise action on a live process. - **Response:** pre-agreed actions for common alert types, which in OT often means “investigate and contain without interrupting the process” rather than “isolate the host”. - **Tuning:** a feedback loop so expected behaviour (for example, a scheduled engineering download) stops generating noise. Integrate with your SIEM or SOC platform if you have one, but do not assume IT playbooks will work unchanged in OT.  These require a different approach that needs to be developed in partnership with your OT stakeholders. ## Step 4: Turn vulnerabilities into a manageable risk list Raw vulnerability counts are not a useful metric in OT. Prioritise using: - Asset criticality and the consequence of its failure - Exposure, for example whether the asset is reachable from IT or by remote access - Whether a known exploit exists and is relevant to your configuration - Whether compensating controls such as segmentation or access restriction already reduce the risk For each high-priority item, choose one of: patch in the next suitable window, apply a compensating control, or formally accept the risk with an owner and review date. ## Step 5: Use the communication map to drive segmentation The tool's flow data is one of the most valuable outputs for engineering. Use it to design or validate zones and conduits, write firewall rules based on observed traffic, and detect when new cross-zone flows appear after segmentation is in place.  This won't be a 2-week job - it requires careful planning with your OT stakeholders who champion the program because they understand the commensurate risk reduction.  You can often model network zones virtually as a starting point, to de-risk the transition. ## Step 6: Standardise across sites If you run several sites, agree a common set of definitions: asset criticality ratings, zone naming, alert severities and response times. Without that, comparing sites is guesswork, and so is deciding where to spend next.  It helps drive consistency, even if your plants have varying levels of legacy and architecture, depending on when they were built/acquired. ## Step 7: Measure outcomes, not activity Report measures that show risk reducing over time, for example: - Percentage of assets with a named owner and criticality - Proportion of critical assets in a segmented zone - High-priority vulnerabilities with a decision (patch, mitigate or accept) within an agreed time - Mean time to triage OT alerts - Maturity score by site against target ### A clearly labelled example *Example only:* a manufacturer with four sites might find that one site has a fully owned inventory and a tuned alert workflow, while three sites have sensors installed but no named asset owners. The next quarter's priority is then obvious: assign owners and run inventory reviews at those three sites before buying more sensors.  You can use the one good site as a benchmark, and engage OT stakeholders in some friendly competition by stack-ranking their relative maturity levels. ## Step 8: Fund the operating model Licence renewals are easier to justify when you can show what the tool has enabled. Build the ongoing costs (staff time, MSSP fees, sensor maintenance) into a multi-year program so operations are funded alongside the technology.  This may seem like extra work and cost upfront, but it's the difference between realising 20% of the value in the first year, and 80%.   ## Where NetSeg can help Leon Poggioli, the founder of NetSeg, has extensive experience with OT Asset and Risk visibility tools, and recognises that the tooling is only 20% of the solution - the rest is the right people and processes built upfront, that the tool is deployed around.  If you'd like help on this next step of your OT Cybersecurity journey (or getting more value from a tool that just hasn't lived up to it's promise), [Book a call with Leon](https://calendar.app.google/o99MXnVhifvWKSAa6) and we can chat further. ## Share this post [mailto:https%3A%2F%2Fwww.netseg.io%2Fnetseg-blog%2Foperationalise-claroty-armis-dragos-nozomi](mailto:https%3A%2F%2Fwww.netseg.io%2Fnetseg-blog%2Foperationalise-claroty-armis-dragos-nozomi) ## Keep reading ### [![](https://www.netseg.io/hs-fs/hubfs/PLC-Panel-Explained-7.webp?width=1456&height=816&name=PLC-Panel-Explained-7.webp) ASD Essentials for OT: What does it mean for me? How do I get started?](https://www.netseg.io/netseg-blog/asd-essentials-for-ot-essential-eight-changes) ### [![](https://www.netseg.io/hs-fs/hubfs/grok-image-e1481c97-ec8a-4680-8151-9a81e3ad295e.jpg?width=1117&height=618&name=grok-image-e1481c97-ec8a-4680-8151-9a81e3ad295e.jpg) How to build and fund a 3–5 year OT security program](https://www.netseg.io/netseg-blog/build-fund-3-5-year-ot-security-program) [![](https://www.netseg.io/hs-fs/hubfs/transparent%20white%20logo.png?width=946&height=302&name=transparent%20white%20logo.png)](https://www.netseg.io/) --- [Privacy Policy](https://www.netseg.io/privacy-policy) © 2026. 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