Some organizations may want the ISA firewall to act more like a traditional SOHO router, where the ISA firewall acts as a DHCP Server for the corporate network. You can install the DHCP service on the ISA firewall and create Access Rules that allow the ISA firewall to provide IP addressing information to hosts on the corporate network.

We will assume that you have already installed the DHCP server. The next step is to configure the ISA firewall to allow the DHCP Request and DHCP replies with messages required to assign corporate network clients IP addressing information.

Perform the following steps to create the DHCP Request Access Rule:

1. In the Microsoft Internet Security and Acceleration Server 2004 management console, expand the server name, and then click the Firewall Policy node. In the Task pane, click the Tasks tab. Click the Create a New Access Rule link.

2. On the Welcome to the New Access Rule Wizard page, enter a name for the rule in the Access Rule name text box. In this example, we ll name the rule DHCP Request. Click Next.

3. Select the Allow option on the Rule Action page. Click Next.

4. On the Protocols page, select the Selected protocols option from the This rule applies to list. Click Add.

5. In the Add Network Entities dialog box, click the Infrastructure folder, and then double-click the DHCP Request entry. Click