BIND 9.6 Flaw - CNAME vs. A Record in MX Records are NOT "Illegal"

[Matus UHLAR - fantomas]

On 27.01.09 08:46, Al Stu wrote:
> So then you disagree that the following example returns a valid address 
> record for srv1?
> 
> srv1  300 IN A 1.2.3.4
> mx1   300 IN CNAME srv1.xyz.com.
> @   300 IN MX 1 mx1.xyz.com.
> 
> 1) Select Target Host:
> The MX query for xyz.com delivers mx1.xyz.com which is a CNAME.
> 
> 2) Get Target Host Address:
> The A query for mx1.xyz.com delivers the address (A) record of 
> srv1.xyz.com, 1.2.3.4, and also delivers the alias (CNAME) record of 
> "mx1.xyz.com".

They are two queries. If mx1 would be an A, it would be returned in the
first query. Since it's a CNAME, the IP is not returned in the MX query.

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