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PPTP VPN Point-to-Point Tunneling Protocol (PPTP) was developed by Microsoft for Windows NT 40 It builds upon standard PPP to encapsulate and encrypt IP traffic It is common to use MS-CHAP v2 with PPTP to add authentication and provide a secure solution PPTP is not easily integrated into non-Microsoft networks If you need to support older Microsoft VPN clients (Window 98, etc), or if a certificate distribution system is not available, PPTP is your best choice L2TP VPN Layer 2 Tunneling Protocol (L2TP) was developed by Cisco and is known to be deployed in conjunction with IPSec L2TP/IPSec encrypts and authenticates each password transmitted across the network It is supported by multiple platforms, including UNIX-based and Macintosh systems It requires a network certificate service, from which VPN end-point computers can receive encryption certificates Windows 2000, Windows XP, and Vista all support L2TP/IPSec
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When using either automatic or L2TP VPN, you can also specify a few IPSec options When selecting automatic and PPTP is ultimately used, IPSec will not be used, but you can provide the settings for those cases when L2TP VPN is automatically selected Managing IPSec is shown in Figure 11-12
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Figure 11-11 The Networking tab allows you to manage the protocols your VPN connection will use
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Figure 11-12 Within the VPN Properties menu, you can also manage IPSec settings
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8 The last tab is the Sharing tab, shown in Figure 11-13 Internet Connection Sharing (ICS) options on this tab include whether to share the VPN connection with other users on the same LAN, whether to dial up a connection when other users need the VPN connection first, and whether other users can turn ICS on and off
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Figure 11-13 You can manage sharing options using the Sharing tab on your VPN connection
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Establishing a VPN Connection
As we pointed out previously, a VPN connection can be made over a dial-up connection or a broadband connection, such as a LAN or a Digital Subscriber Line (DSL) or cable service Once you have successfully connected to the Internet, you can then connect to a VPN end point in a remote network To establish a VPN connection, from the Start menu, open the Network Connections window by typing NCPACPL into the Search field and pressing ENTER Once the Network Connections window opens, shown in Figure 11-14, locate the connection you need, and double-click it Alternately, you could follow these steps: 1 From the Start menu, click Connect To In the Connect To window, choose Connect To A Network, and click the VPN connection you want to use Click the Connect button to launch the VPN connection 2 If the connection is configured to first dial another type of connection, Windows Vista tries to establish this connection before attempting the VPN connection If prompted to establish this connection, click Yes Then dial the connection as discussed in the 5 3 Once the necessary connection is established, you ll see the Connect dialog box After you confirm that the user name is correct and have entered the password for the account, click Connect
Figure 11-14 When you connect to your VPN, Vista will prompt you for user name and password
Microsoft Windows Vista Administration
USING GROUP POLICY TO ACHIEVE NETWORK SECURITY
Vista improves upon Group Policy, an already invaluable administration tool Administrators specify settings, or policies, that are applied to all computers or to a subset defined by you Policies are stored on and synchronized among all domain controllers, which makes them resilient and easy to deploy across your environment 14 discusses Group Policy management in detail, although the opportunity for reviewing the options for network security presents itself here Network access and security settings policies affect network connections, dial-up connections, and Remote Assistance configurations These policies affect a system s connectivity to the network, as well as remote access to the system
Local Policies
Before we review the security policies, we should identify the containers where these policies are found First, the Local Security Policy accompanies every Vista workstation You can view these policies using the Local Security Policy Management Console, which you can launch from the Start menu by typing secpolmsc into the Search field and pressing ENTER Looking at Figure 11-15, notice the parent node, Security Settings Expand this, if it is not already, and expand the Local Policies node by double-clicking it Finally, expand the Security Options node by double-clicking it To edit a policy, or to learn more about what a particular policy does, simply double-click it
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