IDS/IPS systems

An Intrusion Detection System (IDS) or Intrusion Prevention System (IPS) detects and – if possible – prevents activities that either compromise system security, or are a hacking attempt. An IDS/IPS monitors servers or the network for suspicious (and possibly hostile) activity and alerts the systems manager when these activities are detected.

A typical example of an IDS/IPS alert is the occurrence of a port scan, often used by hackers to find vulnerabilities in Internet-attached devices.

An IDS monitors a server or a network and provides alerts when something suspicious happens. An IPS, however, can also stop attacks by for instance changing firewall rules on the fly to block detected unwanted traffic. IPS systems are often combined with firewall functionality or have a direct interface to it. Two types of IDS/IPS systems exist: Network based IDS (NIDS) and Host based IDS (HIDS)

  • A NIDS is typically placed at a strategic point within the network to monitor traffic to and from all devices on that network. A good place would be a central firewall, a core switch or a DMZ router. The NIDS is not part of the network flow, but just “looks at it”, to avoid detection of the NIDS by hackers.
  • A HIDS runs on individual servers or network devices, where it monitors the network traffic of that device. It also monitors user behavior and the alteration of critical (system) files. A good place for a HIDS is a critical (production) server, or a server that can be reached from the Internet, like a webserver, an email server or an FTP server.

An IDS system works in one of two ways:

  • Looking for specific signatures of known threats; similar to the way antivirus software works (also known as a statistical anomaly-based IDS)
  • Comparing traffic patterns against a baseline and looking for anomalies (also known as a Signature-based IDS)

This entry was posted on Friday 14 December 2012

Earlier articles

Infrastructure as code

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(Hyper) Converged Infrastructure

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Software Defined Storage (SDS)

What's the point of using Docker containers?

Identity and Access Management

Using user profiles to determine infrastructure load

Public wireless networks

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UX/UI has no business rules

Technical debt: a time related issue

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Project managers and architects

Using ArchiMate for describing infrastructures

Kruchten’s 4+1 views for solution architecture

The SEI stack of solution architecture frameworks

TOGAF and infrastructure architecture

The Zachman framework

An introduction to architecture frameworks

How to handle a Distributed Denial of Service (DDoS) attack

Architecture Principles

Views and viewpoints explained

Stakeholders and their concerns

Skills of a solution architect architect

Solution architects versus enterprise architects

Definition of IT Architecture

What is Big Data?

How to make your IT "Greener"

What is Cloud computing and IaaS?

Purchasing of IT infrastructure technologies and services

IDS/IPS systems

IP Protocol (IPv4) classes and subnets

Infrastructure Architecture - Course materials

Introduction to Bring Your Own Device (BYOD)

IT Infrastructure Architecture model

Fire prevention in the datacenter

Where to build your datacenter

Availability - Fall-back, hot site, warm site

Reliabilty of infrastructure components

Human factors in availability of systems

Business Continuity Management (BCM) and Disaster Recovery Plan (DRP)

Performance - Design for use

Performance concepts - Load balancing

Performance concepts - Scaling

Performance concept - Caching

Perceived performance

Ethical hacking

The first computers

Open group ITAC /Open CA Certification

Sjaak Laan


Recommended links

Ruth Malan
Gaudi site
Byelex
XR Magazine
Esther Barthel's site on virtualization


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The postings on this site are my opinions and do not necessarily represent CGI’s strategies, views or opinions.

 

Copyright Sjaak Laan