c# qr code generator source Configuring Virtual Private Networks for Remote Clients and Networks in Visual C#.NET

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Configuring Virtual Private Networks for Remote Clients and Networks
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that do not support secure authentication protocols, consider not enabling VPN access for these clients. Only enable VPN access for these clients if there is a strong business need to do so, and if you do not have the option of upgrading the clients.
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ISA Server 2004 allows you to use pre-shared keys in place of certificates when creating remote-access and gateway-to-gateway VPN connections. Pre-shared keysupport for IPSec-based VPN connections should be used only for testing purposes. A single remote-access server can use only one pre-shared key for all L2TP/IPSec connections requiring a pre-shared key for authentication. This means that you must issue the same pre-shared key to all L2TP/IPSec VPN clients. Unless you distribute the pre-shared key within a Connection Manager profile, each user must manually enter the pre-shared key into the VPN client software settings. This reduces the security of the L2TP/IPSec VPN deployment. Using RADIUS for authentication does not increase the level of security for VPN connections. The only advantage of using RADIUS is that you can centralize policy management for multiple ISA Server computers acting as VPN remote-access servers. Using SecurID can significantly increase the level of security for the VPN connections because SecurID requires access to the token that provides a one use password. However, deploying SecurID significantly increases the complexity of the VPN server deployment.
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Lesson Review
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Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you have difficulty answering these questions, review the material in this lesson before beginning the next lesson. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. Your company needs to support VPN clients that use Microsoft Windows 98, Windows 2000, and Windows XP to connect to ISA Server 2004. The computers are all configured with smart-card readers, and each user has been issued a smart card. What is the most secure authentication protocol that is available for these clients a. CHAP b. MS-CHAP c. MS-CHAP v2 d. EAP 2. You need to ensure that your VPN clients attempting to connect have the Windows Firewall installed and enabled. How would you accomplish this
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Lesson 1
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Planning a Virtual Private Networking Infrastructure
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3. You want to use L2TP/IPSec as your tunneling protocol. Some of your VPN clients are running Windows NT 4.0 Workstation. What must you do to enable L2TP/IPSec support with the least amount of effort a. Do nothing. L2TP/IPSec support is built into NT 4.0 Workstation. b. Download and install the Ms12tp.exe on the clients. c. You must upgrade the clients to Windows 2000 Professional or Windows XP. d. Install a Connection Manager package to deliver the L2TP/IPSec client.
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Lesson Summary
Virtual private networking allows secure remote access to resources on an organization s internal network for users outside the network. The VPN is a virtual network that enables communication between a remote-access client and computers on the internal network or between two remote sites even though the computers might be in different locations and separated by a public network such as the Internet. ISA Server 2004 supports two VPN tunneling protocols: Point-to-Point Tunneling Protocol (PPTP) and Layer Two Tunneling Protocol with Internet Protocol security (L2TP/IPSec). PPTP uses Point-to-Point Protocol (PPP) user authentication methods and Microsoft Point-to-Point Encryption (MPPE) to encrypt IP traffic. L2TP/IPSec uses PPP user authentication methods and IPSec encryption to encrypt IP traffic. ISA Server 2004 supports a variety of VPN authentication protocols. Whenever possible, you should use MS-CHAP version 2 or Extensible Authentication Protocol (EAP). VPN quarantine control allows you to scan the VPN client computer configuration before allowing it access to the organization s network. You can use VPN quarantine control to prevent remote access to a private network until a client-side script validates the remote-access client configuration. ISA Server supports two types of VPN connections: remote-client access VPN connection, and site-to-site VPN connections. When you enable VPN access on ISA Server, it uses the VPN Clients network, the Quarantined VPN Clients network and remote site networks to filter network traffic. Implementing a VPN infrastructure must be planned carefully because you are deliberately exposing your internal network to the Internet. For the highest level of security, implement the most secure authentication and tunneling protocols possible.
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