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LAB 3 • In this lab, you configure a set of basic packet-filtering rules for a network. The internal network is represented by 192.168.120.0; the firewall is hosted at 192.168.120.1; the e-mail server is at 192.168.120.2; the Web server is at 192.168.120.3; and the DNS server is at 192.168.120.4. Designing a Rule Base • Create a rule that allows internal hosts to access the external network. • Create a rule that prevents access to the firewall. • Create a rule that allows internal and external access to the e-mail server and Web server. • Create a rule that allows internal access to the DNS server. 3 A Typical Packet-Filtering Rule Base Packet-filtering rule base Rule Source IP Source port Destination IP Destination port Action What it does 1 2 3 4 5 6 7 8

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In this lab, you configure a set of basic packet-filtering rules for a network. The internal network is represented by 192.168.120.0; the firewall is hosted at 192.168.120.1; the e-mail server is at 192.168.120.2; the Web server is at 192.168.120.3; and the DNS server is at 192.168.120.4.

Designing a Rule Base

•Create a rule that allows internal hosts to access the external network.

•Create a rule that prevents access to the firewall.

•Create a rule that allows internal and external access to the e-mail server and Web server.

•Create a rule that allows internal access to the DNS server.

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