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Lesson 2
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Configuring Multiple Networking on ISA Server
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7-19
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4. If the request is allowed by an access rule, ISA Server checks the network rules again to determine how the networks are connected. ISA Server checks the Web chaining rules (if a Web Proxy client requested the object) or the firewall chaining configuration (if a SecureNAT client or a Firewall client requested the object) to determine how the request will be serviced. 5. The request is forwarded to the Internet Web server.
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Remember that both access rules and network rules can block access to a network resource. If an exam question presents you with a scenario in which a user cannot access a resource on another network, look for information on both the access rule configuration and the network rule configuration.
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Creating a New Network Rule
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To create a new network rule, use the following procedure: 1. In the Microsoft ISA Server Management Console tree, expand the Configuration node and click Networks. 2. In the Details pane, click the Network Rules tab. 3. On the Tasks tab, click Create a New Network Rule. 4. On the Welcome to the New Network Rule Wizard page, in the Network Rule Name: box, type the name for the network rule. Click Next. 5. On the Network Traffic Sources page, click Add, as shown in Figure 7-4.
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Figure 7-4
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Configuring the network traffic source for a network rule
7-20
7
Configuring ISA Server as a Firewall
6. On the Add Network Entities page, select the Network Entity to which this rule will apply. Click Add, and then click Close. 7. On the Network Traffic Sources page, click Next. 8. On the Network Traffic Destinations page, click Add. 9. On the Add Network Entities page, select the Network Entity to which this rule will apply. Click Add, and then click Close. 10. On the Network Traffic Destinations page, click Next. 11. On the Network Relationship page, as shown in Figure 7-5, click Network Address Translation or Route. Click Next.
F07im05
Figure 7-5 Configuring the network relationship for a network rule
12. On the Completing The New Network Rule Wizard page, review the settings and then click Finish.
Planning
To determine the address relationship between two computers on different networks, ISA Server processes network rules according to the order that the rules are listed in the ISA Server Management Console interface, looking for a rule that matches the computer addresses. The first rule that matches the computer addresses defines the network relationship. This means that you may have a routing relationship configured between two networks, but a NAT relationship configured between a specific computer on the network and the other network. In this case, the network rule defining the NAT relationship should be listed first to ensure that this specific rule is applied
Lesson 2
Configuring Multiple Networking on ISA Server
7-21
Practice: Configuring Multiple Networking on ISA Server
In this practice, you will configure a new network on the ISA Server computer. You will then configure a new network rule that defines a NAT relationship between the Internet and the perimeter network and another network rule that defines a route relationship between the Internal network and the perimeter network.
To complete this practice, you need three network adapters installed on the computer running ISA Server. This practice assumes that the third network adapter is assigned the IP address 172.6.1.1. All other practices only require two network adapters. Later practices do not depend on this practice.
Note
Exercise 1: Configuring a New Network on ISA Server
1. Log on to ISA1 as an Administrator. Open ISA Server Management Console. 2. In the Microsoft ISA Server Management Console tree, expand the Configuration node and click Networks. 3. In the details pane, click the Networks tab. 4. On the Tasks tab, click Create a New Network. 5. On the Welcome To The New Network Wizard page, in the Network Name: box, type Perimeter Network. Click Next. 6. On the Network Type page, click Perimeter Network, and then click Next. 7. On the Network Addresses page, click Add. 8. In the IP Address Range Properties page, type 172.16.1.0 as the Starting Address and 172.16.1.255 as the Ending Address. Click OK. 9. On the Network Addresses page, click Next. 10. On the Completing The New Network Wizard page, review the settings and then click Finish. 11. Click Apply to apply the changes.
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