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There s another threat out there to your network: home computers These are the devices that connect to your network through a VPN, but you have no control over how they are configured and managed You don t have any say about whether antivirus and antispyware tools are installed and updated, or whether the user and anyone else in the home are practicing safe computing Between what a user does on his or her own time and what little Jimmy downloads from some peer-to-peer (P2P) site, you probably want to check the health of these computers before you allow them to connect to your network NAP provides a way to do this It allows network administrators to check for required programs, registry settings, and files each time a home computer makes a VPN connection to the network If the computer is diagnosed as being unhealthy, it can be given limited access to the network until the computer s health has improved
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NAP utilizes four components to check a computer s health and limit its access, if necessary Those components are: IPSec IEEE 8021X authenticated network connections VPNs Dynamic Host Configuration Protocol (DHCP)
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These tools can be used individually or in cooperation to limit the access of unhealthy computers Network Policy Server (NPS) is used as a health policy server for these technologies
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NOTE In order to use NAP, your network s server must use Longhorn Server, and clients must use Vista or Longhorn Server Let s take a closer look at these technologies and what they do
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IPSec enforcement includes two elements: Health Registration Authority (HRA) IPSec NAP Enforcement Client
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The HRA issues X509 certificates to clients when they are deemed to be healthy The certificates are used to authenticate NAP clients when they try to communicate with other NAP clients via an IPSec-secured channel Since it uses IPSec, IPSec enforcement can define requirements for secure communications with other healthy clients based on IP address or TCP/ User Datagram Protocol (UDP) port number Once they have successfully connected and obtained a valid IP address configuration, communication can be confined to those nodes
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8021X
8021X enforcement includes two elements: NPS Server EAPHost EAP Enforcement Client
An NPS server will instruct an 8021X access point (be it an Ethernet switch or a wireless access point) to apply a restricted access profile on an unhealthy 8021X client until it is deemed healthy enough Restricted access profiles can include IP packet filters or virtual LAN (VLAN) identifiers that will confine the client s traffic
VPNs
VPN enforcement includes two elements: VPN NAP Enforcement Server VPN NAP Enforcement Client
VPN enforcement allows VPN servers to impose health policy requirements whenever a computer attempts a VPN connection to the network
DHCP
DHCP enforcement includes two elements: DHCP NAP Enforcement Server DHCP NAP Enforcement Client
11:
Network Security
DHCP enforcement allows DHCP servers to enforce health policy requirements when a computer attempts to lease or renew an IP address configuration This is the easiest way to deploy health policy enforcement, since all DHCP clients must lease IP addresses Unfortunately, it is also the weakest form of enforcement
Configuring NAP
Configuring NAP on clients is a fairly straightforward affair At its heart, all you need to do is enable or disable certain forms of health examination But that s not the only thing you can do when configuring NAP clients The following sections examine some of the more common configuration tasks you might perform
NAP Client Configuration
The NAP client is configured using the NAP Client Configuration tool, shown in Figure 11-18
Figure 11-18 NAP is configured on a client by using the NAP Client Configuration tool
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To access the tool: 1 Click Start 2 Click All Programs 3 Click Accessories 4 Click Run 5 Type napclcfgmsc, and press ENTER, or launch Microsoft Management Console (MMC), and select the NAP Client Configuration snap-in Several steps must be followed to ensure that you ve properly configured NAP on your Vista clients
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