c# barcode generator example Lesson 2: Configuring Network Access Protection in C#

Drawing Quick Response Code in C# Lesson 2: Configuring Network Access Protection

Lesson 2: Configuring Network Access Protection
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Enforcement Types
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For NAP to work, a network component must enforce NAP by either allowing or denying network access. The sections that follow describe the different NAP enforcement types you can use: IPsec connection security, 802.1X access points, VPN servers, and DHCP servers.
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Terminal Services Gateway
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Terminal Services Gateway enforcement is not discussed in this book because it is not covered on the exam.
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IPsec Connection Security This enforcement type requires clients to perform a NAP health check before they can receive a health certificate. In turn, this health certificate is required for IPsec connection security before the client can connect to IPsec-protected hosts. IPsec enforcement allows you to require health compliance on a per-IP address or a per-TCP/UDP port number basis. For example, you could allow noncompliant computers to connect to a Web server but allow only compliant computers to connect to a file server even if the two services are running on a single computer. You can also use IPsec connection security to allow healthy computers to communicate only with other healthy computers. IPsec enforcement requires a CA running Windows Server 2008 Certificate Services and NAP to support health certificates. In production environments, you will need at least two CAs for redundancy. Other public key infrastructures (PKIs) will not work. IPsec enforcement provides a very high level of security, but it can protect only computers that are configured to support IPsec.
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Deploying a PKI
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For more information about deploying a new Windows-based PKI in your organization, see Windows Server 2008 Help And Support, http://www.microsoft.com/pki, and Windows Server 2008 PKI and Certificate Security by Brian Komar (Microsoft Press, 2008).
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802.1X Access Points This enforcement type uses Ethernet switches or wireless access points that support 802.1X authentication. Compliant computers are granted full network access, and noncompliant computers are connected to a remediation network or completely prevented from connecting to the network. If a computer falls out of compliance after connecting to the 802.1X network, the 802.1X network access device can change the computer s network access. This provides some assurance of compliance for desktop computers, which might remain connected to the network indefinitely. 802.1X enforcement uses one of two methods to control which level of access compliant, noncompliant, and unauthenticated computers receive:
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Configuring Windows Firewall and Network Access Protection
An access control list (ACL) A set of Internet Protocol version 4 (IPv4) or Internet Proto-
col version 6 (IPv6) packet filters configured on the 802.1X access point. The 802.1X access point applies the ACL to the connection and drops all packets that are not allowed by the ACL. Typically, you apply an ACL to noncompliant computer connections and allow compliant computers to connect without an ACL (thus granting them unlimited network access). ACLs allow you to prevent noncompliant computers from connecting to one another, thus limiting the ability of a worm to spread, even among noncompliant computers. A virtual local area network A group of ports on the switch that are grouped together to create a separate network. VLANs cannot communicate with one another unless you connect them using a router. VLANs are identified using a VLAN identifier, which must be configured on the switch itself. You can then use NAP to specify in which VLAN the compliant, noncompliant, and unauthenticated computers are placed. When you place noncompliant computers into a VLAN, they can communicate with one another. This can allow a noncompliant computer infected with a worm to attack, and possibly infect, other noncompliant computers. Another disadvantage of using VLANs is that the client s network configuration must change when transitioning from being a noncompliant NAP client to being a compliant NAP client (for example, if they are able to successfully apply updates). Changing the network configuration during system startup and user logon can cause Group Policy updates or other boot processes to fail. Your 802.1X access points may support ACLs, VLANs, or both. If they support both and you re already using either ACLs or VLANs for other purposes, use the same technique for 802.1X enforcement. If your 802.1X access point supports both ACLs and VLANs and you are not currently using either, use ACLs for 802.1X enforcement so you can take advantage of their ability to limit network access between noncompliant clients. VPN Server This enforcement type enforces NAP for remote access connections using a VPN server running Windows Server 2008 and Routing and Remote Access (other VPN servers do not support NAP). With VPN server enforcement enabled, only compliant client computers are granted unlimited network access. The VPN server can apply a set of packet filters to connections for noncompliant computers, limiting their access to a remediation server group that you define. You can also define IPv4 and IPv6 packet filters, exactly as you would when configuring a standard VPN connection.
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