Chapter 9 Cisco IOS Firewall. IOS Firewall  Stateful packet-filter firewall that runs on a router  Provides firewall capabilities and normal routing.

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Presentation transcript:

Chapter 9 Cisco IOS Firewall

IOS Firewall  Stateful packet-filter firewall that runs on a router  Provides firewall capabilities and normal routing functionality  Based on Context-Based Access Control (CBAC)

Context-Based Access Control  Has similar objectives as ASA  Dynamically modifies the extended ACLs to allow return traffic of connections established from the inside network  Inspects transport level and application level protocols  Keeps track of the number and duration of sessions by inspecting packets

CBAC Protection against Denial of Service Attacks  Limits total number of half-open TCP or UDP sessions  Limits number of half-open sessions based on time  Limits number of half-open sessions per host