In fact, most programs don't require specific firewall rules. Many network administrators don't want to tackle the difficult task of determining all the appropriate rules for every program that is used by the organization, and then maintaining that list over time. ![]() This design can also be deployed together with one or more of the other designs that add IPsec protection to the network traffic permitted. Traffic can be blocked or permitted based on the characteristics of each network packet: its source or destination IP address, its source or destination port numbers, the program on the device that receives the inbound packet, and so on. Traffic that doesn't match the rules is dropped. ![]() In this design, you deploy firewall rules to each device in your organization to allow traffic that is required by the programs that are used. The Basic Firewall Policy Design helps you to protect the devices in your organization from unwanted network traffic that gets through the perimeter defenses, or that originates from inside your network. Many organizations have a network perimeter firewall that is designed to prevent the entry of malicious traffic in to the organization's network, but don't have a host-based firewall enabled on each device in the organization.
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