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Chapter 3. Building ConnectivityRefer to the following sections for information about these topics:
A firewall must be configured with enough information to begin accepting and forwarding traffic before it can begin doing its job of securing networks. Each of its interfaces must be configured to interoperate with other network equipment and to participate in the IP protocol suite. A firewall must also know how to reach other subnets and networks located outside its immediate surroundings. You can configure a firewall to use static routing information or information exchanged dynamically with other routers. You can even configure a firewall to handle IP multicast traffic, either as a proxy or as a multicast router. You can also configure a firewall to provide various DHCP services so that hosts connected to its interfaces can get their IP addresses dynamically. This chapter discusses each of these topics in detail. |
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