DNS Round Robin

Kevin Darcy kcd at daimlerchrysler.com
Fri Jan 30 00:25:45 UTC 2004

Bell, William IT wrote:

>Quick question:
>Does BIND v9.2.3 allow multiple CNAME records, used to implement DNS round
>robin?  For example:
>beta1.company.com.	30	IN	A
>beta2.company.com.	30	IN	A
>beta3.company.com.	30	IN	A
>beta.company.com.	30	IN	CNAME		beta1.company.com.
>beta.company.com.	30	IN	CNAME		beta2.company.com.
>beta.company.com.	30	IN	CNAME		beta3.company.com.
>(You can also see a similar example in the middle of page 274 of the DNS &
>BIND, 4th Ed. book.)
>If not, does v9.2.3 support the 'multiple-cnames' statement?
>The DNS & BIND book states that neither of these features will work after
>BIND 9.1.0, but I was wondering if things might have changed since the book
>was published.
No, it doesn't work, and it never *should*have* worked. CNAMEs are 
exclusive, one-to-one mappings. Period. End of sentence. Use A-record 
round-robin's or get yourself a real load-balancing device.

                              - Kevin

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