Apart from the basic features covered in the preceding sections, PIX also supports some fairly advanced features, complementing its capability to provide basic packet filtering based on the ASA. These features serve various purposes in the PIX Firewall. Most of them, such as the alias and some of the sysopt commands, are used to provide additional flexibility to the PIX Firewall to fit into a networking environment without changing the existing setup. Others, such as the various guards, are used to provide additional security to the networks protected by the PIX Firewall.
The following sections discuss these features, how they work, and the problems they are used to solve.
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