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Definition

What is NIDS?

A network-based intrusion detection system is designed to help organisations monitor their cloud, on-premise and hybrid environments for suspicious events that could indicate a compromise. This includes policy violations and port scanning, plus unknown source and destination traffic.

NIDS security technologies are ‘passive’ rather than ‘active’ in nature. This means that they are designed solely to alert on suspicious activity, and for this reason are often deployed alongside intrusion prevention systems (IPS) which are ‘active’.

For organisations looking to further increase threat visibility, NIDS systems are commonly used in conjunction with host-based intrusion detection systems (HIDS) and SIEM solutions, which aggregate and analyse security events from multiple sources.

Overview

Detecting hidden security threats

Given the advanced nature of today’s cyber threats, protecting your business now requires the ability to detect and respond to attacks that bypass firewalls and other traditional perimeter security controls. Network-based intrusion detection systems (NIDS) help to improve visibility of malicious activity inside your network that could otherwise go unnoticed.

Info

How does NIDS work?

To detect threats, network-based intrusion detection systems gather information about incoming and outgoing internet traffic. To maximise visibility, NIDS sensors are strategically placed across a network, for example on a LAN and DMZ.

NIDS systems utilise a combination of signature and anomaly-based detection methods. Signature-based detection involves comparing the characteristics of collected data packets against signature files that are known to be malicious. Anomaly-based detection uses behavioural analysis to monitor events against a baseline of ‘typical’ network activity.

When malicious or anomalous activity arises on a network, such as a sudden increase in network traffic, NIDS technologies detect the activity and generate alerts for investigation.

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Managed IDS

Why choose a 24/7 managed IDS service?

While an out-of-the-box network-based intrusion detection system is undoubtedly a powerful security tool, leveraging its capabilities can require organisations to invest a significant amount of time and effort in keeping their system up-to-date and optimised to ensure it delivers the security outcomes they desire.

If not properly configured and maintained, a behaviour-based NIDS has the potential to generate hundreds of daily alerts, which can quickly lead to IT teams suffering alert fatigue. Few organisations have the resources to monitor NIDS security technologies around-the-clock and when genuine incidents do occur, they also lack the expertise needed to shut them down quickly and effectively.

A Managed IDS service can help to overcome these and other security challenges by supplying experienced security experts to deploy, configure and monitor network-based and host-based intrusion detection systems and allowing in-house teams to focus on other important tasks.

About us

Why choose Redscan?

  • A leading UK-based MDR company
  • Red and blue team CREST CSOC expertise
  • High-quality intelligence and actionable outcomes
  • Quick and hassle-free service deployment
  • An agnostic approach to technology selection
  • Avg. 9/10 customer satisfaction, 95% retention rate

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From the blog
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6th April 2021
Ransomware and exchange server attacks increase significantly
New research has revealed significant surges in ProxyLogon attacks and ransomware. The research shows a 57% increase in ransomware attacks over the past six months, with the number of affected organisations rising by 9% each month to date in 2021.  
31st March 2021
Redscan research suggests NHS security improvements
Our NHS FOI analysis reveals that NHS trusts made notable improvements to cyber security in 2020, despite the pressures of COVID-19. View some of the news coverage here.
30th March 2021
NCSC updates security alert for UK educational establishments
The National Cyber Security Centre (NCSC) has updated a security alert and is providing additional advice to UK schools, colleges and universities in response to the increase in ransomware attacks against them since the end of February.
26th March 2021
Redscan is now part of Kroll
We're pleased to share the news that Redscan has been acquired by Kroll, the the World's Premier Provider of services and digital products related to governance, risk and transparency. Learn more