The internal network has a Web server, a mail server, and an FTP server that users on the Internet can access. All other access to hosts on the internal network is denied from outside users.
ll users on the internal network are allowed unrestricted access to the Internet. Internal users are allowed to ping devices on the Internet, but users on the Internet are not allowed to ping devices on the inside.
The company used in this configuration has purchased a Class A network from their ISP (10.1.1.x). The .1 and .2 addresses are reserved for the external router and the outside interface of the PIX respectively. Addresses .3 - .5 are used for internal servers that users on the Internet can access. Addresses .6 - .14 are reserved for future use for servers that external users can access.
The PIX Firewall in the example has four network interface cards, but only two of them are in use. The PIX is set up to send syslogs to a syslog server on the inside with an IP address of 192.168.1.220 (not shown in the Network Diagram
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