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In either case, certificates from the same CA must be installed on both ISA servers in each
location, either through domain-based enrollment or through the web-based enrollment
mechanisms.
Creating an L2TP/IPSec Site-to-Site VPN Connection
The first step in setting up a L2TP site-to-site VPN connection is to configure the remote
site network definition. To do this, perform the following steps:
1. Open the ISA Server Management Console.
2. Select the Virtual Private Networks (VPN) node from the console tree.
3. Select the Remote Sites tab from the Details pane.
FIGURE 10.9 Creating a certificate request for the ISA server.
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Configuring an L2TP Site-to-Site VPN Connection Between Two ISA Servers in Remote Sites
4. Select Create VPN Site-to-Site Connection from the Tasks pane.
5. Enter the name of the connection in the Network Name field; for example, enter
Toronto and click Next.
6. Select Layer 2 Tunneling Protocol (L2TP) over IPSec and then click Next.
7. Click OK when prompted about needing to create a remote user account.
8. Enter the IP address of the remote ISA server (for example, 192.168.10.253), and
then click Next.
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