Updating mcafee detection signature
An intrusion detection system (IDS) is a device or software application that monitors a network or systems for malicious activity or policy violations.
Any malicious activity or violation is typically reported either to an administrator or collected centrally using a security information and event management (SIEM) system.
Though they both relate to network security, an IDS differs from a firewall in that a firewall looks outwardly for intrusions in order to stop them from happening.
Firewalls limit access between networks to prevent intrusion and do not signal an attack from inside the network.
An IDS describes a suspected intrusion once it has taken place and signals an alarm.
An IDS also watches for attacks that originate from within a system.
This is traditionally achieved by examining network communications, identifying heuristics and patterns (often known as signatures) of common computer attacks, and taking action to alert operators.
A system that terminates connections is called an intrusion prevention system, and is another form of an application layer firewall.