With the commercial firewall market dominated by expensive firewall products such as those from Checkpoint, Nokia and Cisco (PIX Firewall), many smaller organizations rely on packet filtering technologies and Access-Control Lists (ACLs) on perimeter routers to provide basic firewall features or perimeter defenses. Since IOS 11.2(P), Cisco has enhanced the ability of its perimeter routers to perform a basic firewall function with the introduction of the Cisco IOS Firewall feature set. Although not suitable for all situations the Firewall feature set is a substantial improvement over ACL based filters.
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