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Remote access policies are unique to each local machine but not unique to Routing And Remote Access. Once created, they can be read either by Routing And Remote Access or by a RADIUS server configured on the local machine. Similarly, you cannot remove remote access policies simply by disabling Routing And Remote Access. They are written to the local hard disk and stored until they are specifically deleted either from the Routing And Remote Access console or from the Internet Authentication Ser vice console (the administrative tool for RADIUS servers). By default, two remote access policies are preconfigured in Windows Server 2003. The first default policy is Connections To Microsoft Routing And Remote Access Server. This policy is configured to match every remote access connection to the Routing And Remote Access service. When Routing And Remote Access is reading this policy, the policy naturally matches every incoming connection. However, when the policy is being read by a RADIUS server, network access might be provided by a non-Microsoft vendor; consequently, this policy will not match those connections. The second default remote access policy is Connections To Other Access Servers. This policy is configured to match every incoming connection regardless of network access server type; however, because the first policy matches all connections to Routing And Remote Access, only connections to other remote access servers read and match the policy when the default policy order is not changed. Unless the first policy is deleted or the default policy order is rearranged, this second policy can be read only by RADIUS servers.

Domain Name System (DNS) provides a method for mapping computer names to Internet Protocol (IP) addresses in a distributed database. This lesson introduces you to DNS and how it is used on a Windows Server 2003 network.

Each remote access policy is based on policy conditions that determine when the policy is applied. For example, a policy might include a condition that Windows-Groups matches DOMAIN1\Telecommuters; this policy would then match a connection whose user belongs to the Windows global security group Telecommuters. Figure 10-15 shows such a policy.

Authorizing Remote Access Connections 10-29

Explain the need for name resolution and DNS. Identify the major components necessary in creating a DNS structure. Describe the name resolution process. Explain how DNS is used by Active Directory.

Figure 10-15

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Clicking the Add button opens the Select Attribute dialog box, which allows you to add a new category for a remote access policy condition. For example, the NAS-IP-Address attribute allows a RADIUS server to distinguish remote access clients connecting through a particular remote access server (as distinguished by IP address). Figure 10-16 shows the Select Attribute dialog box and its associated set of configurable attributes.

management application such as SCCM 2007 can be extremely beneficial. You can use SCCM not only to deploy the applications themselves, but also deliver updates to the workstations automatically, on a schedule determined by the administrators.

As you ll learn in Lesson 3, computers on a Transmission Control Protocol/Internet Protocol (TCP/IP-) based network are uniquely identified using an IP address. IP addresses are decimal representations of long binary numbers; a typical IP address is 192.168.132.103. Even though the decimal representations are easier to deal with than the binary numbers they represent, they are not so easy for people to remember and work with. Computers on a TCP/IP network are called hosts and are also given unique, simplelanguage host names to identify them. An example might be the host name mailserver. People find it much easier to work with names, but the routing protocols in TCP/IP work with IP addresses. Name resolution is a process that brings host names and IP addresses together. Name resolution is the process of resolving a host name to an IP address. When a user or application searches for a host name, the name resolution service used on the network is queried. The service looks up the host name, matches it to an IP address, and returns the IP address to the computer where the user or application needs it. IP rout ing takes over from there and make sure the data goes where it needs to go. There are a number of name resolution services in use today, including:

Figure 10-16

By clicking the Add button in the Select Attribute dialog box, you can open a dialog box that allows you to configure the condition for a specific attribute. For example, if

HOSTS files Still in use on some networks, HOSTS files are a predecessor to DNS and are files with static mappings of hostnames to IP addresses. LMHOSTS files In the early days of Microsoft networking, a different computer name called a NetBIOS computer name was used to name computers on the network. NetBIOS names represented an alternative to hostnames. LMHOSTS files tracked NetBIOS names and IP address mappings.

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you click the Add button when the Authentication-Type attribute is selected, the Authentication-Type dialog box opens, as shown in Figure 10-17. This dialog box allows you to choose which remote access connections, as specified by authentication protocol, will match the policy. In the example given, the policy is configured to match unauthenticated connections. Similarly, you can specify the particular elements for any attribute you choose to serve as the conditions for a policy.

Figure 10-17

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Only membership of global security groups can serve as a remote policy condition. You cannot specify membership of universal or domain local security groups as the condition for a remote access policy.

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