June 2018
Intermediate to advanced
368 pages
11h 1m
English
Content preview from Managing Mission - Critical Domains and DNS
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CNAME/Alias
"I am reliably informed that CNAME was intended as a transition mechanism when renaming internet resources, and that the way we use them today (www, etc), is crazy."
- Paul Vixie
"I recommend that all CNAME records be eliminated. DNS should have been designed without aliases."
- Dr. Daniel J. Bernstein.
Here is the CNAME syntax:
<OWNER-NAME> IN CNAME <cname target>
The CNAME or Alias is a "canonical name"–the easiest way to understand it is as an alias for "the actual name".
Given:
web.example.com. IN CNAME www.example.com.
It would mean that web.example.com is another identifier for www.example.com. In practical terms, when a resolver does a lookup on web.example.com and gets a CNAME in response, it will restart the query process ...
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