PIX Firewall

PIX Firewall is an example of a stateful packet filter. PIX also can work on higher layers of the protocol stack for various protocols such as FTP, RealAudio, and others that need the firewall to be aware of them at the application layer. PIX Firewall is a standalone firewall that runs on its own operating system rather than run as an application on top of another OS. This chapter discusses the functioning of the PIX Firewall and some of its advanced features that are important in using it as a firewall in today's complex networks.

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