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Chapter 9 Cisco IOS Firewall

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

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Chapter 9 Cisco IOS Firewall

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  1. Chapter 9 Cisco IOS Firewall

  2. 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)

  3. 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

  4. 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

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