In Andor (2022), the rebel intelligence cell at Ferrix doesn't wait for the Empire to announce its arrival. They funnel every signal, every movement, every comm transmission into a single command center and watch the whole network in real time. The moment something looks wrong, someone knows. That is exactly what a Network Intrusion Detection System does for your enterprise, and CIS Safeguard 13.3 says you should have one.
What Is Deploy a Network Intrusion Detection Solution?
A Network Intrusion Detection System (NIDS) monitors traffic flowing across your network and flags activity that matches known attack signatures or looks statistically abnormal. It is a passive listener. It watches. It alerts. It does not block on its own, but it tells you something is happening before that something becomes a breach.
The official CIS text defines this safeguard as: "Deploy a network intrusion detection solution on enterprise assets, where appropriate. Example implementations include the use of a Network Intrusion Detection System (NIDS) or equivalent cloud service provider (CSP) service."
Why It Matters
Most attackers do not detonate on day one. They move laterally, quietly, probing for credentials and data before they do anything loud. Without visibility into network traffic, you will not see them until the damage is done. A NIDS gives your security team early warning: a spike in unusual outbound traffic, a port scan from an internal host, command-and-control beaconing on a weird port. That early warning is the difference between containment and a six-week forensic engagement.
From a business standpoint, regulators and cyber insurers increasingly want to see active monitoring controls. A NIDS is direct, auditable evidence that you are watching your network.
Key Details or How It Works
- A NIDS sits on a network tap, span port, or inline sensor and inspects copies of traffic without disrupting the flow
- Detection methods include signature-based matching (known bad patterns), anomaly-based detection (deviations from a baseline), and protocol analysis (traffic that violates expected behavior)
- Cloud environments use equivalent capabilities: AWS GuardDuty, Azure Defender for Network, and GCP's Network Threat Detection all provide NIDS-style coverage for cloud-native workloads
- Alerts feed into a SIEM or SOC for triage and response; a NIDS without a process for acting on alerts is just expensive noise generation
- Placement matters: sensors at network perimeters, between internal segments, and at cloud ingress points provide layered coverage
- NIDS generates high volumes of alerts, so tuning and suppression of known-good traffic is an ongoing operational task, not a one-time setup activity
How to Implement Deploy a Network Intrusion Detection Solution
- Identify placement points. Map your network segments, cloud environments, and internet egress points. Determine where sensors will provide the most coverage. Prioritize perimeter, east-west traffic between segments, and any segment housing sensitive data or critical systems.
- Select your tooling. Choose a NIDS solution appropriate to your environment: on-premises hardware or virtual sensors (Snort, Suricata, Zeek, commercial platforms), cloud-native services, or a managed detection service. Match capability to your team's capacity to operate and tune it.
- Deploy and configure sensors. Install sensors at the identified points. Configure span ports or network taps on physical infrastructure. For cloud, enable the relevant service and point it at your VPCs or virtual networks.
- Integrate with your SIEM or alerting platform. Raw NIDS alerts have limited value sitting in a console nobody watches. Feed alerts into your SIEM, ticketing system, or managed SOC so detections trigger a response workflow.
- Tune the ruleset and establish baselines. In the first 30 to 60 days, suppress false positives and document what normal traffic looks like. A tuned sensor produces actionable alerts. An untuned one produces alert fatigue.
- Define and test your response process. Document who gets paged, what they do first, and how escalation works. Run a tabletop exercise using a simulated NIDS alert. If nobody has practiced responding to a detection, the tool is not actually protecting you.
Final Thoughts
The rebels in Andor did not win intelligence battles by hoping the Empire would send a formal notice before arriving. They built the infrastructure to see movement across the whole network and they acted on what they saw. Your adversaries are not sending notices either. A NIDS is how you see them coming. Get it deployed, get it tuned, and make sure someone is actually watching the board.
Resources
Here is a link to the Policy Templates provided free of charge from the fine folks at the Center for Internet Security.
Looking for even more detail? Here you go. If this still does not satisfy your curiosity, DM me.
Official CIS Text
CIS Control 13: Network Monitoring and Defense Operate processes and tooling to establish and maintain comprehensive network monitoring and defense against security threats across the enterprise's network infrastructure and user base.
CIS Safeguard 13.3: Deploy a Network Intrusion Detection Solution Deploy a network intrusion detection solution on enterprise assets, where appropriate. Example implementations include the use of a Network Intrusion Detection System (NIDS) or equivalent cloud service provider (CSP) service.
Shameless Marketing Information
Gotham Technology Group helps organizations design, deploy, and operate network intrusion detection solutions that fit their environment and their team's capacity to act on what the sensors find. If you want to move from "we should have a NIDS" to "we have a NIDS and it is working," let's talk.