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Generator QR Code 2d barcode in C#.NET External Network Internal Network Perimeter Network VPN Site-To-Site Network

External Network Internal Network Perimeter Network VPN Site-To-Site Network
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Figure 7-3 Choosing a network type for a new network
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Configuring Multiple Networking on ISA Server
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Configuring VPN site-to-site networks will be discussed in detail in 10, Configuring Virtual Private Networks for Remote Clients and Networks.
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6. After selecting the network type, click Next. 7. If you selected an internal, perimeter, or external network type, on the Network Addresses page, click Add. 8. In the IP Address Range Properties page, type the starting and ending addresses, and then click OK. 9. On the Completing The New Network Wizard page, review the settings and then click Finish. To modify a network, click the network in ISA Server Management Console and then click Edit Selected Network.
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How to Configure Network Rules
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When you enable networks or network objects on ISA Server, you can configure network rules that define how network packets will be passed between networks or between computers. Network rules determine whether there is a relationship between two network entities and what type of relationship is defined. Network relationships can be configured as follows:
Route When you specify this type of connection, client requests from the source network are directly routed to the destination network. The source client address is included in the request. A route relationship is bidirectional. That is, if a routed relationship is defined from network A to network B, a routed relationship also exists from network B to network A. Network Address Translation (NAT) When you specify this type of connection, ISA Server replaces the IP address of the client on the source network with its own IP address. A NAT relationship is directional. It indicates that the addresses from the source network are always translated when passing through ISA Server. For example, by default a NAT network relationship is defined between the Internet and the internal network. When a client makes a request on the Internet, the IP addresses of the internal client computer are replaced by the address on the ISA Server computer before the request is passed to the server on the Internet. On the other hand, when a packet from the Internet is returned to the client computer, the address of the server is not translated. Client computers on the internal network can access the actual addresses of computers on the Internet, but computers on the Internet cannot access the internal IP addresses.
7-18
7
Configuring ISA Server as a Firewall
Planning If you are using the private IP addresses on any network that is protected by ISA Server, you must define a NAT relationship between that network and the Internet. This is because the private IP addresses are not routable on the Internet. In this configuration, only the IP address assigned to the external network adapter on the ISA Server computer is accessible from the Internet so all other addresses must be translated.
When no relationship is configured between networks, ISA Server drops all traffic between the two networks.
Default Network Rules
When you install ISA Server 2004, the default network rules listed in Table 7-2 are created.
Table 7-2 ISA Server Default Network Rules
Network Rule Local Host Access VPN Clients to Internal Network Internet Access
Network Relationship This rule defines a route relationship between the Local Host network and all other networks. This rule defines a route relationship among the Internal network and the Quarantined VPN Clients and the VPN Clients networks. This rule defines a NAT relationship among the internal network, the Quarantined VPN Clients, and the VPN Clients networks and the External network.
How Network Rules and Access Rules Are Applied
ISA Server uses both network rules and access rules to determine whether a client request is passed from one network to another. Together, the network rules and access rules comprise the firewall policy. The firewall policy is applied in the following way: 1. A user using a client computer sends a request for a resource located on another network. For example, a client on the Internal network sends a request to a server located on the Internet. 2. ISA Server checks the network rules to verify that the two networks are connected. If no network relationship is defined between the two networks, the request is refused. 3. If a network rule defines a connection between the source and destination networks, ISA Server next processes the access rules. The rules are applied in order of priority as listed in the ISA Server Management Console interface. If an allow rule allows the request, then the request is forwarded without checking any additional access rules. If no access rule allows the request, the final default access rule is applied, which denies all access.
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