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Firewalls today have to be very sophisticated about how to control traffic. Basic traffic can flow through a firewall effortlessly, but complex protocols need to have extra help. Cisco provides the PIX firewall with fixup support to assist these complex protocols. This chapter explains what they do, when they are required, and how to configure them. In addition, it covers the advanced topics of content filtering, DHCP settings, PPPoE configuration, and Routing Information Protocol (RIP) support.