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Lesson 3
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Implementing VPNs 10-49
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Lesson 3: Implementing VPNs
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A virtual private network allows users to securely connect through the Internet to a remote private network. In a remote access VPN scenario using Windows Server 2003, a single user connects across the Internet to a Windows Server 2003 computer running Routing And Remote Access. In an extranet scenario, private local area networks (LANs) are joined across the Internet by two Windows Server 2003 computers running Routing And Remote Access.
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After this lesson, you will be able to
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Configure a remote access VPN Diagnose and resolve issues related to remote access VPNs Provide secure access between private networks through a router-to-router VPN Troubleshoot router-to-router VPNs Manage devices and ports Manage packet filters Troubleshoot client access to remote access services
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Estimated lesson time: 75 minutes
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Understanding Virtual Private Networks
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Virtual private networks are logical networks that physically span the Internet. With a VPN, private packets are first encrypted and then encapsulated within a public packet addressed to the remote VPN server. This routing information allows the encrypted payload of private data to tunnel through the public network to reach its endpoint. Upon receiving the encapsulated data through a VPN tunnel, the VPN server then removes the public header and decrypts the private payload. Figure 10-27 illustrates this concept.
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Private Network Tunneling Protocol Header Private Network
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Data Packet (Encrypted)
Data Packet (Original)
Internet
Data Packet (Decrypted)
VPN Server
Tunneling Tunnel Protocol Trailer
VPN Server
Figure 10-27
VPN tunneling
10-50
10
Configuring and Managing Remote Access
An important feature of VPNs is that the public physical network through which private data is sent becomes transparent to the two endpoints of communication, as illustrated in Figure 10-28. Two computers, Computer1 and Computer2, are physically connected only through the Internet. The transparency of this physical link is revealed in Figure 10-28 by the results of the Tracert command run at each computer. Although many hops separate the two computers, each appears to the other as only one hop away through the VPN connection. Communication occurs between the two private IP addresses, each within the 192.168.10.0 subnet, as if the computers were both located on an isolated network segment.
computer1 192.168.10.1 Physical Link 207.46.102.32 ISP C:\>tracert computer2
Tracing route to computer2 [192.168.10.2]
over a maximum of 30 hops:
1 460 ms 460 ms 580 ms COMPUTER2 [192.168.10.2]
Trace complete.
VPN Link
C:\>tracert computer1
Tracing route to computer1 [192.168.10.1]
131.107.5.9 over a maximum of 30 hops:
1 482 ms 496 ms 528 ms COMPUTER1 [192.168.10.1]
Trace complete.
computer2 192.168.10.2
Figure 10-28
VPN example
Exploring VPN Deployment Scenarios
VPNs are typically deployed either to allow users remote access to a network or to con nect two or more private networks. The following section describes the configuration requirements for these scenarios and for a third, mixed scenario in which the VPN server is located behind a firewall. Because all three scenarios involve network access beyond the VPN server, the VPN servers in all cases must be enabled for LAN and demand-dial routing (settings found on the General tab of the server properties dialog box in the Routing And Remote Access console). Furthermore, for all of the following
Lesson 3
Implementing VPNs 10-51
scenarios, the dial-in properties for all user accounts are assumed to be left at the default setting of Control Access Through Remote Access Policy. Remote Access VPN In a basic remote access scenario, the VPN allows a telecom muter to connect to an office network through the Internet. To allow this type of VPN, an administrator typically defines a remote access policy granting access to connec tions matching a NAS-Port-Type condition of Virtual (VPN) and a Windows-Groups condition matching a group created specifically for the purpose of allowing VPN access. On the client side, the telecommuter uses the New Connection Wizard to create a VPN connection specifying his/her own user credentials and the IP address of the remote VPN server. The user then dials in to a local ISP and connects to the office intra net through the VPN connection. Alternatively, if the user is logging on to a domain over the VPN connection, he/she can specify both the VPN and ISP connections through the Log On To Windows dialog box. Figure 10-29 illustrates this scenario.
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