BIND 9 implements two new RRs, discussed in the following sections.
RFC2672 specifies the DNAME record. The RFC is titled "Non-Terminal DNS Name Redirection," which means that DNAME is similar to CNAME but does not alias a single name. Instead, it aliases a whole domain. It is non-terminal in the sense that when a DNAME is found, a new name is computed and then resolved. CNAME, on the other hand, is terminal in the sense that when the CNAME record has been found, the job is done.
DNAME is a simple enough record:
[domainname] DNAME [target]
The effect of this is that the entire subtree of DNS identified by the domain name can be mapped onto the target domain. The main purpose of this is to create a mechanism to ...