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Remote Access VPN Components and Design Points |
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For VPN clients who want concurrent access to intranet and Internet resources when the VPN connection is active, you can do one of the following:
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Select the Use Default Gateway On Remote Network check box (the default
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setting) and allow Internet access through the organization intranet. Internet traffic between the VPN client and Internet hosts would pass though firewalls or proxy servers as if the VPN client is physically connected to the organization intranet. Although it has an impact on performance, this method allows Internet access to be filtered and monitored according to the organization s network policies while the VPN client is connected to the organization network.
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If the addressing within your intranet is based on a single class-based network ID, clear the Use Default Gateway On Remote Network check box. The best example is when your intranet is using the private IP address space 10.0.0.0/8.
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If the addressing within your intranet is not based on a single class-based
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network ID, you can use one of the following solutions:
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The DHCPInform message sent by Windows XP clients includes the
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requesting of the DHCP Classless Static Routes DHCP option. If config ured on a Windows Server 2003 DHCP server, the Classless Static Routes DHCP option contains a set of routes representing the address space of your intranet that are automatically added to the routing table of the requesting client.
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The CMAK for Windows Server 2003 allows you to configure specific
routes as part of the CM profile distributed to VPN users. You can also specify a Uniform Resource Locator (URL) that contains the current set of organization intranet routes or additional routes beyond those configured in the profile.
Clear the Use Default Gateway On Remote Network check box, and use
the route add command set on the VPN client to add static routes for the network IDs of your intranet. The intranet static routes should point to the IP address that was assigned to the client by the VPN gateway as the next routed hop. That way, all unknown traffic will flow to the VPN tun nel for resolution. Tip Using one of the preceding methods is a practice known as split-tunneling, which means that there are active routes from the client to the insecure Internet and the company s intranet. Usually, split-tunneling is not a good idea because it creates a security breach from the connected VPN clients to the user s home network. If a client that has IP routing enabled is compromised by a hacker and the VPN connection was made with split-tunneling enabled, the entire corporate network can be compromised. Most security policies do not allow split-tunneling as a default policy.
PART II
VPN Deployment
From the client computer, you can determine your assigned IP address from the display of the Ipconfig command or by double-clicking the VPN connection in the Network Connections folder when the VPN connection is active. In the resulting Status dialog box, click the Details tab. The VPN client s assigned IP address is listed as Client IP Address.
Design Point: Routing Infrastructure
Consider the following when configuring the routing infrastructure for remote access VPN connections:
Configure the Internet interface of the VPN server with a default gateway. Do
not configure the intranet interface of the VPN server with a default gateway.
Add static IP routes to the VPN server that summarize the addresses used in
your intranet. Alternatively, if you use either RIP or OSPF for your dynamic routing protocol, configure and enable RIP or OSPF on the VPN server. If you are using a Cisco proprietary routing protocol such as Interior Gateway Routing Protocol (IGRP) or Extended IGRP (EIGRP) instead of industry-stan dard routing protocols such as RIP or OSPF, you might configure the VPN server s neighboring Cisco intranet router for RIP or OSPF on the interface connected to the subnet to which the VPN server is attached and IGRP on all other interfaces. You would then redistribute the IGRP routes into the RIP or OSPF routing tables. Refer to your Cisco router documentation to get more information on route redistribution.
Configure the VPN server with an on-subnet address range by obtaining IP
addresses through DHCP or by manually configuring on-subnet address pools.
Quarantine Resources
Network Access Quarantine Control, a new feature in the Windows Server 2003 family, delays normal remote access to a private network until the configuration of the remote access computer has been examined and validated by an administratorprovided script. When a remote access computer initiates a connection to a remote access server, the user is authenticated and the remote access computer is assigned an IP address. However, the connection is placed in quarantine mode, in which network access is limited. The administrator-provided script is run on the remote access computer. When the script notifies the remote access server that it has suc cessfully run and the remote access computer complies with current network poli cies, quarantine mode is removed and the remote access computer is granted normal remote access. If the client computer does not pass quarantine, the server will drop the connection. Quarantine resources consist of servers that a remote access client in quarantine mode can access to perform name resolution (DNS servers), to obtain the latest ver sion of the script (file servers with anonymous access allowed), or to get instruc tions and components needed to make the remote access client comply with network policies (Web servers with anonymous access allowed).
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