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Connecting Remote Users and Networks
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A Connection Or Network wizard, provided that the computer has an analog or ISDN modem installed or connected to it . Dial-up connections either provide remote access to corporate networks or dial-up access to the Internet using the services of an Internet service provider (ISP) .
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VPN connections Connections to a remote workplace by tunneling over the Internet . VPN connections work by creating a secure tunnel that encapsulates and encrypts all traffic between the client computer and the remote corporate network . This tunnel creates a secure private link over a shared public infrastructure such as the Internet . After the user is connected, her experience on the client computer is similar to what it would be if her computer were directly attached to the remote LAN (with performance limitations depending on the speed of the remote connection), with the exception of any restrictions imposed on remote connections by the network administrator . VPN connections are computer-to-server or computer-to-network connections that you can create and configure manually using the Set Up A Connection Or Network wizard . VPN connections can use Internet connectivity, or they can establish an existing broadband Internet connection or an existing analog or ISDN dial-up connection to obtain the Internet connectivity they require .
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The rest of this chapter describes how to create and manage VPN and dial-up connections . For information about LAN and wireless connections in Windows 7, see 25, Configuring Windows Networking .
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As Windows Vista did before it, Windows 7 supports the following types of incoming (serverside) network connections:
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Incoming VPN connections Connections from a remote computer by tunneling over the Internet, using either a broadband Internet connection or a dial-up connection to an ISP Incoming dial-up connections analog or ISDN modem Connections from a remote computer using an
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For more information on how to create and configure incoming connections, see the section titled Configuring Incoming Connections later in this chapter .
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The following connection technologies supported in Windows XP were deprecated in Windows Vista and are no longer available in Windows 7:
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X .25 Microsoft Ethernet permanent virtual circuit (PVC) Direct cable connection using a serial, parallel, universal serial bus (USB), or IEEE 1394 cable
Supported Connection Types
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note
Most types of network connections available in Windows 7 support Ipv6 out of the
box and can be used to establish pure-Ipv6 connectivity with remote servers or networks (provided they support incoming Ipv6 connections). More information concerning Ipv6 support for network connections in Windows 7 is provided throughout this chapter where appropriate.
Configuring VPN Connections
Windows 7 supports both outgoing and incoming VPN connections . For outgoing connections, Windows 7 is the client and connects to a VPN server on a remote network, usually the corporate intranet . For incoming connections, Windows 7 acts as a server and allows a remote client computer to establish a VPN connection between the two computers . In enterprise environments, outgoing VPN connections are commonly used to allow mobile users to securely access resources on the corporate intranet from remote locations . Incoming VPN connections to client computers are rarely used in enterprise environments, so most of this discussion deals with outbound connections only . For information on how to create and configure an inbound connection on Windows 7, see the section titled Configuring Incoming Connections later in this chapter .
Supported Tunneling protocols
Windows 7 supports four different tunneling protocols for creating secure VPN connections to remote corporate networks:
Internet Key Exchange version 2 New in Windows 7, IKEv2 is an updated version of the IKE protocol that uses the IPsec tunnel mode over UDP port 500 . IKEv2 enables VPN connections to be maintained when the VPN client moves between wireless hotspots or switches from a wireless to a wired connection . Using IKEv2 and IPsec together enables support for strong authentication and encryption methods . IKEv2 is documented in RFC 4306 . Secure Socket Tunneling Protocol Supported in Windows Vista Service Pack 1 (SP1) and later versions, SSTP encapsulates PPP frames over HTTPS (HTTP over Secure Sockets Layer [SSL]) to facilitate VPN connectivity when a client is behind a firewall, NAT, or Web proxy that allows outgoing TCP connection over port 443 . The SSL layer provides data integrity and encryption while PPP provides user authentication . SSTP was introduced in Windows Vista SP1 and Windows Server 2008 . SSTP was developed by Microsoft and the SSTP protocol specification can be found on MSDN at http://msdn.microsoft.com/en-us/library/cc247338.aspx. layer Two Tunneling Protocol An industry-standard Internet tunneling protocol designed to run natively over IP networks and which encapsulates PPP frames like
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