Chapter 9<P> Configuring the Point-to-Point Protocol (PPP)

Chapter 9<P> Configuring the Point-to-Point Protocol (PPP) Configuring the Point-to-Point Protocol (PPP)

rlogin

telnet

Commonly, PPP is used to connect computers in homes and small offices to workplace computers (to enable file transfer, remote login, and other TCP/IP capabilities) or to Internet service providers (to access services such as World Wide Web servers and Usenet news).

SCO PPP is an implementation of the Point-to-Point Protocol (PPP) as defined in the following Internet standards: RFC 1144, RFC 1172, RFC 1332, RFC 1334, RFC 1471, RFC 1473, and RFC 1548.

Use PPP when an Ethernet or Token-Ring connection between the local host and another location is not possible but a serial line connection is. PPP can be used to connect the local host to another host via a single, physical serial line connection between serial ports or over longer distances using telephone lines and modems. A computer that is running PPP over one or more serial lines and that is also connected to a computer network (such as an Ethernet) can serve as a communication gateway between computers on the network and the computers at the far ends of the serial lines.

This chapter describes:

Also available for serial line communication, for use instead of PPP, is SLIP. See Chapter 10, ``Configuring the Serial Line Internet Protocol (SLIP)'', for more information on SLIP, and ``Serial line communications'', for a comparison of the two protocols.

SCO PPP supports only asynchronous communications. SCO provides PPP as a discrete package within the SCO TCP/IP runtime system, meaning it may be selectively installed with SCO TCP/IP.

Terminology used in this chapter:

endpoint

the definition of one end of a PPP link -- a PPP interface and its link are constructed from this definition

line

as in serial line -- the physical medium over which data flows

link

as in PPP link -- the virtual connection between two machines over which data flows

interface

as in PPP interface -- the abstract entity to which the IP driver routes datagrams

NPS Fast Facts

Updated: February 18, 2009

Applies To: Windows Server 2008

In Windows Server� 2008, Network Policy Server (NPS) replaces Internet Authentication Service (IAS).

NPS is:

The Microsoft implementation of the Remote Authentication Dial-In User Service (RADIUS) protocol.
Configurable as a RADIUS server.
Configurable as a RADIUS proxy that forwards connection requests to other RADIUS servers for processing.
A required component of Network Access Protection (NAP). When you deploy NAP, NPS functions as a NAP health policy server.
Configurable to perform all three functions (RADIUS server, RADIUS proxy, NAP health policy server) at the same time.
Compatible with user account databases in Active Directory Domain Services (AD DS).

Windows Server 2008 editions and NPS

NPS provides different functionality depending on the edition of Windows Server 2008 that you install:

Windows Server 2008 Enterprise and Windows Server 2008 Datacenter. These server editions include NPS. With NPS in Windows Server 2008 Enterprise and Windows Server 2008 Datacenter, you can configure an unlimited number of RADIUS clients and remote RADIUS server groups. In addition, you can configure a group of RADIUS clients by specifying an IP address range.
Windows Server 2008 Standard. This server edition includes NPS. With NPS in Windows Server 2008 Standard, you can configure a maximum of 50 RADIUS clients and a maximum of two remote RADIUS server groups. You can define a RADIUS client by using a fully qualified domain name or an IP address, but you cannot define groups of RADIUS clients by specifying an IP address range. If the fully qualified domain name of a RADIUS client resolves to multiple IP addresses, the NPS server uses the first IP address returned in the Domain Name System (DNS) query.
Windows Web Server 2008. This server edition does not include NPS.

For more information, see Windows Server 2008 Overview of Editions at http://go.microsoft.com/fwlink/?LinkId=111845.

Upgrade from Windows Server 2003

You can upgrade a server running Windows Server 2003 and IAS to Windows Server 2008 and NPS. During the upgrade process, the server configuration is preserved, including the RADIUS client, connection request policy, accounting, and remote access policy configurations. In NPS, however, remote access policies are renamed to network policies.

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In addition, you can export the configuration of an IAS server in Windows Server 2003, and then import the configuration to an NPS server in Windows Server 2008 by following the instructions in the following article:

NPS servers in Windows Server 2008 systems cannot import configuration settings that were exported from IAS servers in Windows Server 2003 systems

NPS as a role service

NPS is a role service of the Network Policy and Access Services (NPAS) server role. Other role services of NPAS are the Routing and Remote Access service, Health Registration Authority (HRA), and Host Credential Authorization Protocol (HCAP). For information about how to install NPS, see the NPS Operations Guide.

NPS server administration

After you install NPS, you can administer NPS servers:

Locally, by using the NPS Microsoft Management Console (MMC) snap-in, the static NPS console in Administrative Tools, or the network shell (Netsh) commands for NPS.
From a remote NPS server, by using the NPS MMC snap-in, the Netsh commands for NPS, or Remote Desktop Connection.
From a remote workstation, by using Remote Desktop Connection.

Our Microsoft Boot Camp Training Exclusives

Chapter 9
Chapter 9<P> Configuring the Point-to-Point Protocol (PPP) Configuring the Point-to-Point Protocol (PPP)

Windows Server 2008 editions and NPS

Upgrade from Windows Server 2003

NPS as a role service

NPS server administration

Our Microsoft Boot Camp Training Exclusives

Chapter 9 Chapter 9<P> Configuring the Point-to-Point Protocol (PPP) Configuring the Point-to-Point Protocol (PPP)

Windows Server 2008 editions and NPS

Upgrade from Windows Server 2003

NPS as a role service

NPS server administration

Chapter 9
Chapter 9<P> Configuring the Point-to-Point Protocol (PPP) Configuring the Point-to-Point Protocol (PPP)