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Configuring Virtual Private Networks for Remote Clients and Networks
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How Virtual Private Networking Is Implemented Using ISA Server 2004
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When you configure ISA Server 2004 as a VPN server, it relies on and enhances the basic VPN functionality provided by Routing and Remote Access, available with Microsoft Windows Server 2003 and Windows 2000. ISA Server supports two types of VPN connections:
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Remote-client access VPN connection A remote-access client makes a remoteaccess VPN connection that connects to a private network. ISA Server provides access to the internal network to which the VPN server is attached. To configure remote-client VPN access on ISA Server, configure the computer running ISA Server to accept VPN connections and define the parameters for what types of connections will be accepted. Site-to-site VPN connection A VPN gateway server makes a site-to-site VPN connection that connects two private networks. To configure site-to-site VPN connections, you configure a remote-site network on the computer running ISA Server and then define how the VPN connection to the remote network will be created. You also define access rules that determine what types of traffic will be allowed to flow from the remote network to the other networks protected by ISA Server.
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ISA Server assigns computers to networks and then uses network rules, network access rules, and publishing rules to restrict the movement of network traffic between networks. These concepts are also used by ISA Server to manage VPN connections. ISA Server uses the following networks for VPN connections:
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VPN Clients network This network contains the IP addresses of all the VPN clients that have connected using VPN client access. Quarantined VPN Clients network This network contains the IP addresses of all the VPN clients that have connected using VPN client access but have not yet cleared quarantine. Remote-site networks These networks contain the IP addresses of all the computers in remote sites when a site-to-site VPN connection is configured. Additional remote-site networks are created for each remote-site connection.
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ISA Server uses these networks just as it uses any other directly connected networks. That means that you can use network rules and access rules to define the conditions under which network packets will be passed from one network to another. ISA Server uses Routing and Remote Access Service (RRAS) to provide some of the VPN functionality, so RRAS must be running on ISA Server to enable VPN access. Although most VPN configuration is done by using ISA Server Management, you can also configure some advanced settings using Routing and Remote Access; however, you must be
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Planning a Virtual Private Networking Infrastructure
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careful not to override specific settings that should be configured only in ISA Server. In particular, note the following:
If you use RRAS to enable NAT, some ISA Server features may not function properly. Do not use RRAS to enable or disable IP routing. ISA Server always synchronizes RRAS settings, but RRAS does not check how ISA Server configures this functionality. RRAS packet filters are not applied when ISA Server is running. It is recommended that you copy the functionality defined by the packet filters used for quarantine in RRAS to ISA Server.
Guidelines for Planning a VPN Infrastructure
Implementing a VPN infrastructure must be planned carefully because you are deliberately exposing your internal network to the Internet. In many cases, VPN clients have complete access to the internal network, just as if the client computer were connected to the internal network behind the ISA Server computer. This means that your VPN implementation must be as secure as possible. Use the following guidelines when planning your ISA Server VPN implementation:
For the highest level of security, implement a VPN solution that uses L2TP/IPSec, MS-CHAP v2, or EAP/TLS for user authentication and certificate-based authentication for computer authentication. With this configuration, you must deploy certificates to all remote-access clients. However, the certificate authentication means that only computers that have the appropriate certificate will be able to connect. You can also deploy PPTP using certificate-based authentication. In this scenario, you can use two-factor authentication, with devices such as smart cards, to ensure the identity of the remote client. Although this option provides a more secure means to authenticate the remote-access user, it does not provide an option for authenticating the remote-access client computer. If you do not have the option of deploying client certificates to all VPN clients or using smart cards, the most secure option is to use PPTP with password authentication. When you use PPTP, the data is encrypted; however, the authentication mechanism is not as secure. If you use password-based authentication, ensure that you enforce strong passwords by using Group Policy.
Security Alert To ensure network security, you should always require complex passwords for user accounts. This becomes especially important when you enable remote access to your internal network using VPNs. If users do not use secure passwords, an attacker may be able to guess the passwords and gain access to the internal network.
Always use the most secure protocols that both your VPN access servers and clients can support and configure the remote-access server and the authenticating server to accept only secure authentication protocols. If you have older VPN clients
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