Adding Other Records

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Adding Other Records

The main purpose of a DNS Server is to resolve a host name to an IP address. There are, however, other types of information that other organizations may want, such as the address of your mail server. You can add several types of records to the DNS Server. The following list describes these other records:

A. This is a host entry, exactly the same as was entered in the previous section.
AAAA. This is also a host entry; the difference is that you can enter an IPng address (the new version of TCP/IP that will use 128-bit addresses rather than 32-bit).
AFSDB. The AFSDB record gives the address of an AFS (Andrew File System) database server, or a DCE (Distributed Computing Environment) authenticated name server.
CNAME. The canonical name is an alias that points one name such as WWW to another such as Web (see Figure 13.17). This is one of the most common records that you need to enter.
HINFO. Enters machine information about a host, which allows other hosts on the network to find out CPU (Central Processing Unit) type and operating system information.
ISDN. Integrated Services Digital Network allows you to map an entry to an ISDN phone number rather than an IP address. This is used in conjunction with an RT (Route Through) record to automate routing over dial-up ISDN.
MB. This is an experimental record type used to associate an e-mail ID with a particular host ID.
MG. Like an MB record, the MG is experimental; this associates an MB record with a Mail Group that could be used for mailing lists.
MINFO. Another experimental record, MINFO enables you to enter the mail information about the person responsible for a given Mail record.
MR. This is another experimental record. This provides for the Mail records the same service that CNAME entries provide for host names—aliases.
MX. You need to enter at least one MX record (see Figure 13.18). The MX record takes incoming connections for mail and directs them to a mail server. You may enter more than one MX record. If you do, the system uses the Preference Number to determine the order in which to try them (lowest first).
NS. This is a name server record. It is used to find the other name servers in the domain.
PTR. The Pointer record is part of the reverse lookup zone and is used to point the IP address at the host name.
RP. This is where you enter the name (or names) of those people who are responsible for the domain that the server provides resolution for. There can be multiple entries of this type.
RT. This points at another record in the DNS database. The Route Through provides information on how to get to a host using dial-up ISDN or X.25.
SOA. As already discussed, the Start of Authority record provides the basic configuration for a zone.
TXT. The Text record is a way of associating text information with a host. This can provide information about the computer (in addition to the information in an HINFO entry) or other information such as the location.
WKS. Provides the capability to indicate which Well Known Services are running on a particular host. These match the service and protocols that are listed in the services file (%winroot%\System32\drivers\etc) below port 256.
X25. Similar to the ISDN entry, this provides the capability to map a name to an X.121 name.

Adding these records is similar to adding a host record. Right-click the domain or sub-domain and choose New Record. Figure 13.19 shows a zone with several records defined.

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