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Note: You must also create an A record for the host defined as a mail exchanger in an MX record.

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Figure 20.2 CNAME Records in a Reverse-Mapping Zone

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You add CNAME records in the parent zone on your name server. The aliases defined in those CNAME records point to the addresses in PTR records in the child zone delegated to the other server.
When you define a reverse-mapping zone that has a netmask from /25 (255.255.255.128) to /31 (255.255.255.254), you must include an RFC 2317 prefix. This prefix can be anything, from the address range (examples: 0-127, 0/127) to descriptions (examples: first-network, customer1). On a NIOS appliance, creating such a reverse-mapping zone automatically generates all the necessary CNAME records. However, if you need to add them manually to a parent zone that has a child zone with fewer than 255 addresses.

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Figure 20.3 Adding DNAME Records for the Lowest Level Subdomains

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In the case of a domain structure consisting of a single domain (no subdomains), adding a DNAME record redirects queries for every name in the domain to the target domain, as shown in Figure 20.4.

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When using a DNAME record, you must copy the resource records for the source domain to the zone containing the target domain, so that the DNS server providing service for the target domain can respond to the redirected queries.

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Note: This is a conceptual representation of domain name mapping and depicts the resulting hierarchical relationship of corp200.com as the parent zone for corpxyz.corp200.com. The hosts are not physically relocated.

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Note: If you specify a subdomain in the Domain Name field when configuring a DNAME record, and the subdomain is also a subzone, the DNAME record appears in the list view for the subzone, not in the list view for the parent zone that was selected when adding it.

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The DNS client then examines the fields in the NAPTR record as follows:

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