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The issue is that there will be a lag between a new threat being discovered in the wild and the signature for detecting that threat being applied to your IDS.During that lag time your IDS would be unable to detect the new threat.There are IDS that detect based on looking for specific signatures of known threats- similar to the way antivirus software typically detects and protects against malware- and there are IDS that detect based on comparing traffic patterns against a baseline and looking for anomalies.There are IDS that simply monitor and alert and there are IDS that perform an action or actions in response to a detected threat.A hash is a fingerprint of a file that is unique for every file.It is almost impossible to compromise an operating system without changing a system file – and with any changes in a file’s characteristics – the hash or signature is also modified.
Also, RSS feeds are available for the IPS Threat Defense Bulletins: RSS 1.0: Update Bulletin_10RSS 2.0: Update Bulletin_20Problem: Auto Update no longer work after Cisco Intrusion Prevention System, Version 6.2(5)E4 , SSC-AIP-5Error: auto Update successfully selected a package (https://[email protected]//swc/esd/11/273556262/guest/IPS-sig-S838-req-E4.pkg) from the locator service, however, package download failed: The host is not trusted.TYPES OF IDS: NIDS (Network Intrusion Detection System)Network Intrusion Detection Systems are placed at a strategic point or points within the network to monitor traffic to and from all devices on the network.Ideally you would scan all inbound and outbound traffic, however doing so might create a bottleneck that would impair the overall speed of the network.An intrusion detection system (IDS) monitors network traffic and monitors for suspicious activity and alerts the system or network administrator.
In some cases the IDS may also respond to anomalous or malicious traffic by taking action such as blocking the user or source IP address from accessing the network.
IDS come in a variety of “flavors” and approach the goal of detecting suspicious traffic in different ways.