Normalizer-Configures how the IP and TCP normalizer functions and provides configuration for signature events related to the IP and TCP normalizer.This engine inspects stream-based TCP and single UDP and ICMP packets. Multi String-Inspects Layer 4 transport protocols and payloads by matching several strings for one signature.This engine processes events rather than packets. Meta-Defines events that occur in a related manner within a sliding time interval.There are two Flood engines: Flood Host and Flood Net. Flood-Detects ICMP and UDP floods directed at hosts and networks.There are three Fixed engines: ICMP, TCP, and UDP. Fixed-Performs parallel regular expression matches up to a fixed depth, then stops inspection using a single regular expression table.– Atomic IPv6-Detects two IOS vulnerabilities that are stimulated by malformed IPv6 traffic. This engine replaces the 4.x Atomic ICMP, Atomic IP Options, Atomic 元 IP, Atomic TCP, and Atomic UDP engines. Note All IP packets are inspected by the Atomic IP engine. This engine lets you specify values to match for fields in the IP and Layer 4 headers, and lets you use Regex to inspect Layer 4 payloads. – Atomic IP-Inspects IP protocol packets and associated Layer 4 transport protocols. – Atomic IP Advanced-Inspects IPv6 Layer 3 and ICMPv6 Layer 4 traffic. The Atomic ARP engine is different because most engines are based on Layer 3 IP protocol. – Atomic ARP-Inspects Layer 2 ARP protocol. The Atomic engine uses the standardized Regex support.
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You can combine Layer 3 and Layer 4 attributes within one signature, for example IP + TCP. Atomic-The Atomic engines are now combined into four engines with multi-level selections.There are two AIC engines: AIC FTP and AIC HTTP. You can also use AIC to inspect FTP traffic and control the commands being issued. It allows administrative control over applications, such as instant messaging and gotomypc, that try to tunnel over specified ports. The AIC engine provides granular control over HTTP sessions to prevent abuse of the HTTP protocol. AIC-Provides thorough analysis of web traffic.
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Note The Cisco IPS engines support a standardized Regex.Ĭisco IPS contains the following signature engines: Each engine has a set of parameters that have allowable ranges or sets of values. An engine is composed of a parser and an inspector.