Figure 10-11: L2TP Advanced Properties in .NET

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Figure 10-11: L2TP Advanced Properties
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SSTP SSTP VPN tunnels use port 443, meaning that SSTP VPN traffic can pass across almost all firewalls that allow Internet access, something that is not true of the PPTP, L2TP/IPsec, and IKEv2 VPN protocols. SSTP works by encapsulating PPP traffic over the SSL channel of the HTTPS protocol. SSTP supports data origin authentication, data integrity, replay protection, and data confidentiality. You cannot use SSTP through a Web proxy that requires authentication. IKEv2 IKEv2 is a VPN protocol new to Windows 7 and is not present in previous versions of Windows. IKEv2 supports IPv6 and the new VPN Reconnect feature. IKEv2 supports Extensible Application Protocol (EAP) and computer certificates for clientside authentication. This includes Microsoft Protected EAP (PEAP), Microsoft Secured Password (EAP-MSCHAP v2), and Microsoft Smart Card or Other Certificate, as shown in Figure 10-12. IKEv2 does not support POP, CHAP, or MS-CHAPv2 (without EAP) as authentication protocols. IKEv2 supports data origin authentication, data integrity, replay protection, and data confidentiality. IKEv2 uses UDP port 500. When you configure a new Windows 7 VPN connection with the default settings, Windows 7 attempts to make an IKEv2 connection first.
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Figure 10-12: Authentication protocols supported by IKEv2 VPN Authentication Protocols Windows 7 supports different authentication protocols for both dial-up and VPN connections. There are two broad categories of authentication protocol: password-based authentication protocols and certificate-based authentication protocols. Certificate-based authentication protocols require the deployment of a PKI solution such as Active Directory Certificate
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Services. When you use a certificate-based authentication protocol, it is necessary to deploy certificates tied to user accounts, computer accounts, or both types of account. The properties of these protocols are as follows: PAP (Password Authentication Protocol) This protocol uses unencrypted passwords for authentication. This protocol is not enabled by default for Windows 7 VPN connections and is not supported by remote access servers running Windows Server 2008. You would enable this protocol only to connect to an older third-party VPN server that does not support other more secure protocols. CHAP (Challenge Authentication Protocol) This is a password-based authentication protocol. Although remote access servers running Windows Server 2008 do not support this protocol, it is enabled by default for Windows 7 VPN connections and it allows you to connect to third-party VPN servers that do not support other more secure protocols. MS-CHAPv2 (Microsoft Challenge Handshake Authentication Protocol version 2) MSCHAPv2 is a password-based authentication protocol. You can configure a VPN connection that uses this protocol to use the credentials of the currently logged on user for authentication. PEAP/PEAP-TLS (Protected Extensible Authentication Protocol with Transport Layer Security) This is a certificate-based authentication protocol where users authenticate using certificates. Requires the installation of a computer certificate on the VPN server. EAP-MS-CHAPv2/PEAP-MS-CHAPv2 The most secure password-based authentication protocols available to VPN clients running Windows 7; requires the installation of a computer certificate on the VPN server. Does not require a client certificate. Smart Card or Other Certificate Use this protocol when users are authenticating VPN connections using a smart card or a certificate installed on this computer. The properties for this authentication protocol are shown in Figure 10-13.
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Figure 10-13: Smart Card or other Certificate options You can configure which VPN authentication protocols are supported for a connection by editing a VPN connection's properties in the Network Connections control panel, as shown in Figure 10-14. Windows first tries to use the most secure authentication protocol that is enabled and then falls back to less secure protocols if they are available.
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Figure 10-14: VPN Authentication protocols VPN Reconnect VPN Reconnect is a feature new to Windows 7. When you connect to a VPN server using the PPTP, L2TP/IPsec, or SSTP protocol and you suffer some sort of network disruption, you can lose your VPN connection and need to restart it. If you were transferring a file, downloading email, or sending a print job, you need to start over from the beginning. VPN Reconnect allows clients running Windows 7 to reconnect automatically to a disrupted VPN session even if the disruption has lasted for 8 hours. VPN Reconnect also works if connecting to a new Internet access point causes the disruption. For example, a user might be using a VPN connection to his corporate network while connected to a wireless network at an airport coffee shop. As the time of his flight's departure approaches, he moves from the coffee shop to the airport lounge, which has its own Wi-Fi network. With VPN Reconnect, the user's VPN connection is reestablished automatically when he achieves Internet connectivity with the new network. With a traditional VPN solution, this user would have to reconnect manually once he connected to the new wireless network in the airport lounge, and any existing operations occurring across the VPN would be lost. Unlike DirectAccess, which only some editions of Windows 7 support, all editions of Windows 7 support VPN Reconnect. VPN Reconnect uses the IKEv2 tunneling protocol with the MOBIKE extension. The MOBIKE extension allows VPN clients to change their Internet addresses without having to renegotiate authentication with the VPN server. Only VPN servers running Windows Server 2008 R2 support IKEv2. You cannot use IKEv2 if your organization has a routing and remote access server running Windows Server 2003, Windows Server 2003 R2, or Windows Server 2008.
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You can configure VPN Reconnect with a maximum timeout of 8 hours, as shown in Figure 1015. After the period specified in the Network Outage Time setting has expired, it is necessary for the user to reconnect manually. You will create and configure an IKEv2-based VPN connection in the practice exercise at the end of this lesson.
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Figure 10-15: IKEv2 Advanced Properties Quick Check Which VPN protocol supports automatic reconnection
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