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3.1.9 IDS (Intrusion Detection System)
An Intrusion Detection System
(IDS) is a system for detecting attempts to break into or misuse a system
or network.290 It is, in effect, a burglar alarm for your
network.
As with firewalls, they may be implemented
as a dedicated piece of special-purpose hardware, or a software package
running on a network computer. What kind of activities can intrusion
detection systems identify? It varies with the particular IDS, but
can include detection of network scans (in which an attacker is sending
traffic to your network to map it, or find systems with known vulnerabilities),
spoofing attempts and common script kiddie attacks such as denial of
service attacks, attempts to connect to unsupported services, and receipt
of network communication packets that violate standards.
 IDS
An Intrusion Detection System (IDS) is used to detect attempts to break into or misuse a system or network.
Types of attacks an IDS can detect include network scans, packet-spoofing, DoS, other script kiddie attacks, unauthorized attempts to connect to services, improperly-structured TCP/IP packets, and improper activity on a system.
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__________________
290. Network Intrusion Detection Systems FAQ, http://www.robertgraham.com/pubs/network-intrusion-detection.html#1.1, Version 0.8.3, March 21, 2000.
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