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Cisco Firewalls by Alexandre M.S.P Moraes

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Chapter 9. Classic IOS Firewall Overview

This chapter covers the following topics:

Motivations for CBAC: Presents the motivations for the Classic IOS Firewall Stateful Inspection solution, originally known as Context Based Access Control (CBAC).

CBAC basics: Introduces the generic Stateful Inspection of TCP, UDP and ICMP using CBAC. It also promotes a quick comparison between ASA and IOS Firewall philosophies.

ICMP connection examples: Registers how the Classic IOS Firewall can treat ICMP as a pseudo Stateful protocol.

UDP connection examples: Explores some sample UDP connections created through the Classic IOS Firewall.

TCP connection examples: Deals with TCP, the truly stateful transport protocol. It also illustrates some advanced ...

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