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server1 A 172.16.48.1
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If you can ping a computer by IP address but not by name, the computer is miss ing an A resource record in DNS. You can attempt to remedy this situation by executing the Ipconfig /registerdns command at that computer but only if the client computer is running a version of Windows 2000, Windows XP or Windows Server 2003. ,
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Alias (CNAME) Resource Records Alias (CNAME) resource records are also sometimes called canonical names. These records allow you to use more than one name to point to a single host. For example, the well-known server names (ftp, www) are typically registered using CNAME resource records. These records map the host name specific to a given service (such as ftp.lucernepublishing.com) to the actual A resource record of the computer hosting the service (such as server-boston.lucernepublishing.com). CNAME resource records are also recommended for use in the following scenarios:
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When a host specified in an A resource record in the same zone needs to be renamed When a generic name for a well-known server such as www needs to resolve to a group of individual computers (each with individual A resource records) that provide the same service (for example, a group of redundant Web servers)
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Once created in the DNS console, a CNAME resource record that maps the alias ftp.lucernepublishing.com to the host name ftp1.lucernepublishing.com would be rep resented textually within the lucernepublishing.com.dns zone file as follows:
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ftp CNAME ftp1.lucernepublishing.com.
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MX Resource Records The mail exchanger (MX) resource record is used by e-mail applications to locate a mail server within a zone. It allows a domain name such as lucernepublishing.com, specified in an e-mail address such as joe@lucernepublishing. com, to be mapped to the A resource record of a computer hosting the mail server for the domain. This type of record thus allows a DNS server to handle e-mail addresses in which no particular mail server is specified. Often, multiple MX records are created to provide fault tolerance and failover to another mail server when the preferred server listed is not available. Multiple servers are given a server preference value, with the lower values representing higher prefer ence. Once created in the DNS console, such MX resource records would be repre sented textually within the lucernepublishing.com.dns zone file as follows:
@ @ @ MX MX MX 1 10 20 mailserver1.lucernepublishing.com. mailserver2.lucernepublishing.com. mailserver3.lucernepublishing.com.
Note
In this example, the @ symbol represents the local domain name contained in an e-mail address.
PTR Resource Records The pointer (PTR) resource record is used only in reverse lookup zones to support reverse lookups, which perform queries to resolve IP addresses to host names or FQDNs. Reverse lookups are performed in zones rooted in the in-addr.arpa domain. PTR resource records are added to zones by the same manual and automatic methods used to add A resource records. Once created in the DNS console, a PTR resource record that maps the IP address 172.16.48.1 to the host name server1.lucernepublishing.com would be represented tex tually within a zone file as follows:
1 PTR server1.lucernepublishing.com.
Note
In this example, the 1 represents the name assigned to the host within the 172.16.48.in-addr.arpa domain. This domain, which is also the name of the hosting zone, corresponds to the 172.16.48.0 subnet.
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4
Configuring DNS Servers and Clients
SRV Resource Records Service location (SRV) resource records are used to specify the location of specific services in a domain. Client applications that are SRV-aware can use DNS to retrieve the SRV resource records for given application servers. Windows Server 2003 Active Directory is an example of an SRV-aware application. The Netlogon service uses SRV records to locate domain controllers in a domain by search ing the domain for the Lightweight Directory Access Protocol (LDAP) service.
All of the SRV records required for an Active Directory domain controller can be found in a file named Netlogon.dns, located in the WINDOWS\System32\Config folder. If SRV records are missing in your DNS zone, you can reload them automatically by running the Netdiag /fix command at a command prompt. (The Netdiag command is available after you install Win dows Support Tools from the Windows Server 2003 CD-ROM.)
If a computer needs to locate a domain controller in the lucernepublishing.com domain, the DNS client sends an SRV query for the name:
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