Round robin on CNAME

Nate Campi nate at campin.net
Mon Apr 1 19:02:10 UTC 2002


On Sun, Mar 31, 2002 at 10:48:48PM -0500, William Stacey wrote:
> You mean instead of ns1.hotwired.com returning following:
> ;; ANSWER SECTION:
> www.lycos.com.          900     IN      CNAME   www.lycos.com.akadns.net.
> 
> ;; AUTHORITY SECTION:
> .                       237077  IN      NS      I.ROOT-SERVERS.net.
> .                       237077  IN      NS      J.ROOT-SERVERS.net.
> <snip>
> 
> it would return same CNAME RR, but instead of root Authority it would
> return?:
> ;; ANSWER SECTION:
> lycos.com.akadns.net.   88575   IN      NS      zc.akadns.net.
> lycos.com.akadns.net.   88575   IN      NS      zf.akadns.net.
> lycos.com.akadns.net.   88575   IN      NS      zb.akadns.net.
> ...
> ;; ADDITIONAL SECTION:
> zc.akadns.net.          103172  IN      A       63.241.199.50
> zf.akadns.net.          103172  IN      A       63.215.198.79
> ...
> 
> How would the lycos.com zone look to achieve this?   Wouldn't this involve
> out of zone data?  Assuming no caching, the savings is root, net, akadns,
> com (i.e. net of 4 iterations) ?

You would get: 

;; ANSWER SECTION:
www.lycos.com.	3600	IN	NS	a.akadns.lycos.com.

;; ADDITIONAL SECTION:
a.akadns.lycos.com.	3600	IN	A	63.241.199.50

Now remote resolvers can go straight to 63.241.199.50 (and whatever
other nameservers have the delegation done to) and ask for
www.lycos.com.
-- 
Nate

"Whom computers would destroy, they must first drive mad."  -Anon.



More information about the bind-users mailing list