[Gllug] re: DNS query

[t.clarke]

J ake wrote:
> Surely a CNAME is a CNAME and an alias is an alias. A CNAME is not an alias.


According to my O'Reilly DNS book, a CNAME record maps an alias to its canonical name,
whereas a simple alias is an alternative name for a given IP address.

In the O'Reilly book  the example given is:

wormhole.movie.edu.          IN  A               192.249.249.1
wormhole.movie.edu.          IN  A               192.253.253.1

;aliases
wh.movie.edu.                IN CNAME            wormhole.movie.edu.
wh249.movie.edu.             IN A                192.249.249.1
wh253.movie.edu.             IN A                192.253.253.1

Thus, a lookup of wh.movie.edu will return both IP addresses, whereas a lookup of wh249
would only return the one address


Tim


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