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9. On the Network Addresses page, shown in Figure 10-11, click Add to configure the address ranges assigned to the remote network.

If you have not enabled VPN client access on ISA Server, you must enable this before the remote office VPN gateway servers can connect to the ISA Server VPN service. ISA Server considers the remote VPN gateway server connection to be the same as any other VPN client connection.

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After you create the remote site network, it is listed on the Remote Sites tab in ISA Server Management. You can modify the remote site network configuration, including changing the authentication methods, the tunneling protocol, the remote site network IP addresses, and the remote gateway server name or IP address. All these options are the same as when you created the rule, with one exception. On the network properties page, you can configure the VPN tunnel to be terminated after a set period of inactivity.

There are only two differences between configuring a site-to-site VPN using IPSec tunnel mode and configuring a PPTP or L2TP/IPSec based VPN.

When you configure the remote VPN gateway IP address, you must also configure a local VPN gateway IP address used by the computer running ISA Server to listen for VPN connections. You can configure the VPN gateways to use a certificate for authentication or a pre-shared key for authentication.

After you configure the remote-site network, you can also configure advanced IPSec settings. The settings specify the settings IPSec will use when creating the VPN tunnel and can be used to maximize VPN security. To access the advanced IPSec configuration, open the Properties dialog box for the remote-site network that is using IPSec tunneling mode. On the Connection tab, click IPSec Configuration. In the IPSec Configuration dialog box, as shown in Figure 10-12, you can configure the Phase I or Phase II tabs. On the Phase I tab, you can configure the main mode settings of the Internet Key Exchange protocol. This protocol is used to create an initial secure channel between the VPN gateway servers to secure authentication traffic and the traffic that is used to negotiate the encryption settings for the other traffic that will be sent between the gateways. On the Phase II tab, you can configure the quick mode settings of the Internet Key Exchange protocol. This protocol defines the configuration settings for the encryption of network traffic using Encapsulating Security Payload (ESP).

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Note For more information about the configuration of advanced IPSec configuration options, see Configure IPSec Networks in the ISA Server documentation. For more information about IPSec, see the IPSec Technical Reference, which is one of the technical reference documents located at http://www.microsoft.com/resources/documentation/WindowsServ/2003/all/ techref/en-us/Default.asp

When you configure a site-to-site VPN in ISA Server, a new network is established. This network is created for the remote site, but it is treated by ISA Server in the same way as any directly attached network is treated. This means that you can configure access rules to limit the flow of network traffic from the remote site to any other network.

When a remote network is created, the VPN site-to-site connection is enabled. When this happens, ISA Server enables two system policy rules. One of the rules, named Allow VPN Site-To-Site Traffic To ISA Server, allows access from all external networks to the computer running ISA Server (Local Host network), using the VPN tunneling protocols. You can modify the networks from which the ISA Server computer accepts VPN client connections. When this is modified, the system policy rule is changed automatically to apply to the additional or changed networks.