Networking components

SCO networking functionality is provided in several components included with the SCO OpenServer distribution. The distribution products and component packages may be viewed from the Software Manager; for more information, see ``Examining software packages'' in the SCO OpenServer Handbook.

The following components are included with the SCO OpenServer Connectivity package:

SCO Network Drivers -- the individual networking adapter drivers and the Network Configuration Manager configuration framework

Network Installation Boot Modules.

SCO® IPX/SPX™ Runtime System, including:

IPX/SPX Base Runtime System, which enables your system to act as a terminal server for DOS NetWare clients and as a NetWare router. SCO IPX/SPX is also required for SCO Gateway for NetWare.
IPX/SPX Graphical Tools and Related Utilities, which allow you to manage IPX/SPX servers.
IPX/SPX Runtime System Manual Pages.

SCO TCP/IP Runtime System, including:

TCP/IP Runtime utilities and drivers, which provide the basis for TCP/IP networking.
SNMP Agent Runtime Set, which enables your system to run the Simple Network Management Protocol to monitor and manipulate resources across the network.
NetBIOS Runtime utilities and drivers, which allow products such as LAN Manager Client to run over TCP/IP.
Remote Line Printing Runtime Set.
PPP (Point-to-Point Protocol) Runtime utilities and drivers, which enable your system to run TCP/IP over serial lines.
TCP/IP administration tools.
SNMP administration tools.
TCP/IP Documentation, including this guide.

SCO® NFS® Runtime System, including:

Base Network File System (NFS), including automount(NADM).
Network Information Service (NIS), a distributed database that allows administrators to centralize common system administrative files. For more information, see ``Distributed management framework''.
Remote Execution (REX).
Network Lock Manager (NLM).
NFS Documentation, including all NFS manual pages.

SCO LAN Manager Client, which allows your system to access applications and files from a LAN Manager server. The basic component and documentation (manual pages) are included.

SCO Gateway for NetWare, including:

SCO Gateway for NetWare Base Runtime System, which allows your system to access applications and files on a NetWare server.
SCO Gateway for NetWare Print System, which allows your system to access printers on a NetWare server.
SCO Gateway for NetWare Graphical Tools and Related Utilities, which ease administration of the SCO Gateway for NetWare.
SCO Gateway for NetWare Documentation, including manual pages.

SCO PC-Interface, a file sharing, printing, and terminal emulation server package to serve DOS and Windows PCs The basic component and documentation (manual pages) are included.

UNIX System Mail Utilities:

SCO Mail User Agents.
The MMDF (Multichannel Memorandum Distribution Facility) SMTP (Simple Mail Transfer Protocol) channel.
The sendmail runtime system.

UUCP Utilities:

The uucp(C), cu(C), and ct(C) communications utilities.
High-speed modem dialers for UUCP.
mail(C), micnet, and other local message programs.

Microsoft LAN Manager for SCO Systems

The full LAN Manager server system, including:

The NetBEUI protocol stack and Datalink.

MS-DOS and OS/2 client connectivity packages.

The Remoteboot facility.

Over-the-network client installation.

An SNMP agent.

Various administrative utilities.

DCE

The full DCE (Distributed Computing Environment) runtime system, including:

Security Services.

X.500 Directory Services.

Distributed Administration Services.

Cell Directory Service.

Choose an Enforcement Method

Updated: October 6, 2008

Applies To: Windows 7, Windows Server 2008, Windows Server 2008 R2, Windows Vista

To choose the right NAP enforcement method for your network, review the following sections of this guide to understand the details of how each enforcement method works and determine which method best meets your deployment goals:

You might also consider the following when choosing an enforcement method:

Infrastructure. How well does your current network support the enforcement method?
Cost. Which aspect of your NAP deployment is more important: cost or flexibility?
Complexity. Do you have the expertise to implement and maintain your deployment?
Security. How secure is the enforcement method?

Infrastructure

All NAP enforcement methods can be implemented using a minimum of one computer running Windows Server 2008 R2 or Windows Server 2008. All enforcement methods require that NPS is installed on this computer and configured to evaluate the health of NAP clients. Additional required services depend on the enforcement method. For example, IPsec, VPN, and DHCP enforcement methods require a NAP enforcement server running Windows Server 2008 R2 or Windows Server 2008. The 802.1X enforcement method requires network hardware that supports the 802.1X authentication method and is capable of controlling port characteristics using RADIUS tunnel attributes. For more information, see NAP Configuration Overview.

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Cost

Because support for it is built into the Windows operating system, the cost of deploying NAP is typically low, but depends on how well your existing network hardware and software support your design. If you have deployed Windows Server 2008 R2 or Windows Server 2008 on your network, then you already have some or all of the components required to deploy NAP. Some NAP enforcement methods might require an upgrade of the components of your network infrastructure. For example, deploying NAP with 802.1X enforcement can be costly if you do not already have hardware that supports 802.1X authentication. If you already have hardware that supports 802.1X, then it is likely that you can deploy NAP with 802.1X enforcement at minimal cost. If your hardware does not support NAP, in some cases adding support can be as simple as downloading and installing new firmware. To determine the costs associated with a NAP deployment, review hardware and software requirements for the enforcement methods you have chosen and determine whether server and network hardware upgrades are required. Additional costs that might also be associated with a NAP deployment include planning and design costs and the training of support personnel.

Complexity

NAP with IPsec enforcement is generally the most complex enforcement method to deploy because it requires a public key infrastructure (PKI) and IPsec policies to create logical networks. However, Windows Server 2008 R2 and Windows Server 2008 include tools for managing and monitoring IPsec that eliminates much of this complexity. The 802.1X enforcement method is next in terms of complexity, followed by VPN enforcement. DHCP enforcement is the least complex enforcement method to deploy.

Security

IPsec enforcement is a powerful method for protecting compliant computers from any others; it can be combined with server and domain isolation to ensure that after a computer has demonstrated it is compliant, it will still be restricted to communicating only with authorized hosts. IPsec provides other benefits, too. Network packets are authenticated, which reduces the risk of man-in-the-middle and replay attacks, and traffic can be encrypted with IPsec, providing a high degree of protection from eavesdropping attacks.

Like IPsec, 802.1X offers a high degree of protection. Several enhancements to 802.1X are also available that provide improved security. Until a client has demonstrated that it complies with the organization�s health requirements, its access to the network will be restricted by the network switches and wireless access points. These restrictions can be very difficult to bypass, even by a determined malicious user.

VPN enforcement is a good choice for protecting remote access to the corporate network. Clients that connect to a NAP-enabled VPN server can be granted restricted access to the network at the point of entry using IP packet filters. The health of remote client computers is evaluated when the client connects and it is monitored during the VPN session. If a client computer becomes noncompliant, then access is restricted until the computer is compliant.

DHCP enforcement restricts noncompliant computers by providing a limited IPv4 address configuration. It is the least secure NAP enforcement method. It is easily bypassed by an advanced user who has administrative privileges on the computer.

Combining NAP enforcement methods

It is possible to use more than one enforcement method simultaneously. An organization might invest additional resources into combining these enforcement technologies because they have complementary strengths and weaknesses. NAP with VPN enforcement can be used to enforce organizational compliance policies on remote clients, while NAP with IPsec enforcement can be used for local clients. 802.1X and IPsec offer a particularly robust combination because together they can restrict network connectivity at multiple layers of the network protocol stack. The following table shows which enforcement methods can be combined. Keep in mind that the complexity of your NAP deployment will increase when you combine enforcement methods.

	IPsec	802.1X	VPN	DHCP
IPsec
802.1X			X
VPN		X		X
DHCP

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