CNAME Record

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CNAME Record

The CNAME record is an alias, enabling you to specify more than one name for each TCP/IP address. CNAME stands for canonical name. The syntax of a CNAME record follows:

<alias name> CNAME <host name>

Using CNAME records, you can combine an ftp and a web server on the same host, for example. The following example maps a server called InetServer to a TCP/IP address. Then the names FTP and WWW are aliased to this server.

InetServer IN A 136.107.3.43
FTP CNAME InetServer
WWW CNAME InetServer

These records illustrate how easy it is to change the server on which services are provided while still allowing access to the new server for clients that refer to its original name. For example, if you want move the Web server to another machine called New-Inet, you can modify the zone files to read as follows:

InetServer IN A 136.107.3.43
FTP CNAME InetServer
NewInet IN A 136.107.1.107
WWW CNAME NewInet

The only change required for access to the new server was to make entries at the DNS Server; changes do not have to be made at the clients. Any clients querying the DNS Server receive the updated address automatically in response to the query.

Figure 12.10 shows the dialog box used in DNS Manager to add or modify a CNAME record.

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