● Cybersecurity Glossary

What Is IDS/IPS?

IDS: Intrusion Detection System · IPS: Intrusion Prevention System

An Intrusion Detection System (IDS) passively monitors network traffic to identify suspicious activity, policy violations, or known attack patterns and generates alerts for security teams. An Intrusion Prevention System (IPS) takes this a step further by sitting inline in the traffic path and actively blocking detected threats in real time. Together, IDS and IPS form a critical layer of network defense, providing the visibility to detect intrusions and the enforcement to stop them before they cause damage.

IDS/IPS Definition

Intrusion Detection Systems (IDS) and Intrusion Prevention Systems (IPS) are network security technologies designed to identify and respond to malicious activity targeting an organization’s infrastructure.

An IDS is a passive monitoring system. It analyzes network traffic by comparing it against known attack signatures and behavioral baselines. When it detects suspicious activity, it generates an alert for security teams. The IDS itself does not block or modify traffic—it functions as an early warning system.

An IPS is an active enforcement system deployed inline in the traffic path. When it identifies a threat, it can automatically drop malicious packets, reset connections, block offending IPs, or trigger protective actions—all in real time without human intervention.

How Do IDS/IPS Work?

Both IDS and IPS operate by continuously monitoring network traffic and comparing it against known threat patterns and behavioral baselines:

Traffic Monitoring & Capture

An IDS monitors a mirrored copy of traffic via a TAP or SPAN port, not interfering with live flows. An IPS sits directly inline, inspecting every packet in real time.

Deep Packet Inspection

Both perform deep packet inspection (DPI), examining full payload content to detect malware signatures, exploit attempts, C2 communications, and protocol anomalies invisible to basic packet filtering.

Pattern Matching & Analysis

Traffic is compared against signature databases and behavioral baselines. Modern systems use machine learning to detect previously unknown threats by identifying subtle deviations from expected behavior.

Alert Generation (IDS) or Active Blocking (IPS)

IDS generates alerts with details (source IP, signature, severity). IPS automatically executes responses: dropping packets, blocking IPs, terminating sessions, or quarantining hosts.

Detection Methods: Signatures, Anomalies & Behavior

IDS/IPS systems rely on three primary detection methods, often used in combination:

In practice, modern IDS/IPS solutions combine all three methods. Signature matching handles known threats at speed, while anomaly and behavioral analysis catch sophisticated, previously unseen attacks.

Types of IDS/IPS

Classified by deployment scope—what they monitor and where they sit in the infrastructure:

IDS vs. IPS: Key Differences

While IDS and IPS share core detection technologies, their operational role, placement, and response capabilities differ fundamentally:

In modern practice, IDS and IPS are stages in a single control lifecycle. Teams start in IDS mode to validate rules, then transition to IPS for active prevention. Teldat’s be.Safe Pro supports both modes natively with per-rule switching.

IDS/IPS in Modern NGFW and SASE Architectures

Modern network security has converged IDS/IPS into NGFWs and SASE platforms, where IPS is a natively integrated component rather than a separate device.

IPS as a Core NGFW Feature

In an NGFW, IPS works with DPI, application control, SSL/TLS decryption, and threat intelligence. The NGFW knows which application generated a packet, which user is behind it, and whether the destination is malicious—dramatically reducing false positives.

IPS in SD-WAN Environments

Embedding IPS into SD-WAN equipment provides intrusion prevention at every branch without separate appliances. Traffic is inspected locally before exiting to the internet.

IPS as a Cloud Service (SASE/FWaaS)

In SASE architectures, IPS is delivered as a cloud service—same capabilities without local hardware. Ideal for remote workers, SaaS applications, and branches with direct internet access.

Integration with XDR and SIEM

IPS feeds detection data into XDR and SIEM platforms for cross-domain correlation—combining network alerts with endpoint behavior, identity logs, and cloud activity for complete attack chain visibility.

Teldat IPS/IDS: be.Safe Pro

Teldat’s be.Safe Pro integrates IPS/IDS natively within its unified SASE platform—not as a bolt-on, but as a core component working alongside application control, SWG, and threat intelligence.

Real-Time Detection & Prevention

The IPS/IDS engine detects and blocks exploits, brute-force attacks, SQL injections, XSS, and C2 communications in real time. Machine learning and threat intelligence continuously update signatures and assess threats dynamically.

Virtual Patching

When a new CVE is disclosed, the IPS generates ad-hoc signatures that block exploits before the vendor releases a patch. Critical for OT infrastructures and production servers.

Embedded & Cloud Deployment

Embedded IPS in SD-WAN routers (small offices to 10+ Gbps data centers). be.Safe Pro SSE (FWaaS) as cloud service with private instances per customer and points of presence on five continents.

Unified Management

All IPS/IDS policies managed from a single console alongside firewall, SWG, and ZTNA. Per-rule IDS/IPS mode switching, sensitivity tuning, and custom signatures—no specialized certifications required.

Frequently Asked Questions about IDS/IPS

❯ What is the difference between IDS and IPS?

IDS passively monitors and alerts. IPS sits inline and actively blocks threats in real time. IDS provides visibility; IPS provides enforcement.

❯ What detection methods do IDS/IPS use?

Signature-based (known patterns), anomaly-based (baseline deviations), and heuristic/behavioral (ML-driven analysis). Modern systems combine all three for layered detection.

❯ Where should IDS/IPS be deployed?

IDS monitors mirrored traffic (TAP/SPAN). IPS deploys inline. In modern architectures, IPS is integrated into NGFWs at every branch and cloud entry point. Teldat’s be.Safe Pro embeds IPS directly into SD-WAN routers.

❯ Do I need both IDS and IPS?

Modern IPS includes IDS capabilities. Organizations use IDS mode for tuning, IPS mode for enforcement. Teldat’s be.Safe Pro supports both with per-rule switching.

❯ What is the difference between IPS and a firewall?

Firewalls filter at layers 3-4 (IP, ports). IPS performs deep packet inspection at layer 7 for malware and exploits. NGFWs like be.Safe Pro integrate both in a single platform.

❯ What is a false positive in IDS/IPS?

Legitimate traffic incorrectly flagged as a threat. AI-driven systems reduce false positives by up to 35% using behavioral analysis to distinguish real threats from normal variations.

❯ What is Virtual Patching in IPS?

Protects vulnerable systems before vendor patches via ad-hoc signatures that block exploits for newly disclosed CVEs. Essential for OT and critical production environments where immediate patching is not feasible.