Glossary
IPS
IPS is IDS with teeth. Instead of just alerting on suspicious traffic, it automatically blocks it. It sits inline with your network traffic and stops attacks as they happen.
What is IPS?
Intrusion Prevention System - monitors network traffic and actively blocks detected threats in real-time.
Why Should You Care?
An IPS stops attacks mid-stream rather than discovering a breach after the fact, reducing the window during which adversaries can exfiltrate data or establish persistence. For organizations handling regulated data (financial, healthcare, payment cards), this difference between detection and prevention directly impacts breach notification requirements, fines, and liability. Teams that rely on IDS alone often face the hard choice between blocking legitimately suspicious traffic and allowing sophisticated attacks through—IPS removes that bottleneck by making the blocking automatic and fast.
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Real-World Example
A retail chain runs an IPS at its network perimeter and detects an SQL injection attack targeting its web application. Before the malicious payload reaches the backend database, the IPS recognizes the attack signature and drops the traffic inline, preventing the attacker from querying customer payment card data. This happens in milliseconds—faster than any manual response team could react.
How to Protect Against IPS
- 1.
Deploy IPS inline with network traffic
- 2.
Start in detection mode before enabling blocking
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