Case Study: Creating Zones Using the PIX Firewall

The PIX Firewall allows up to ten interfaces with varying security levels to be configured (PIX 535 running 6.X can support up to ten interfaces. PIX 525 running 5.3 and above can support up to eight interfaces). One interface needs to be connected to the inside or private network, and one needs to be connected to the public network. The rest of the interfaces can be connected to other networks, each with its own level of security. Thus, the PIX allows up to ten (eight in the case of PIX 525) distinct security zones to be supported on one firewall.

On the PIX Firewall, each interface is configured to have a security level. Essentially, a machine sitting on a low-security interface cannot access ...

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