answer section with 4.9 and bind 8

[Antoine Medecin]

I would like to understand what happened
betwenn bind 4.9 and bind 8 with the Additional
record field during a resolution.

During the resolution process, when looking
for  ns for a domain or a subdomain , it seems
bind 4.9 was doing a ANY request and now in 8
it is only doing a NS request.

With dig: 

dig @bbnona4 myfsi.hp.com

;; ANSWER SECTION:
myfsi.hp.com.           8H IN CNAME     www.myfsi.com.
www.myfsi.com.          23m57s IN CNAME  myfsi.com.
myfsi.com.              23m57s IN A     216.46.229.179

;; AUTHORITY SECTION:
myfsi.com.              13h45m31s IN NS  NS1.DATARETURN.com.
myfsi.com.              13h45m31s IN NS  NS2.DATARETURN.com.

;; ADDITIONAL SECTION:
NS1.DATARETURN.com.     1d23h1m39s IN A  209.12.95.2
NS2.DATARETURN.com.     1d23h1m39s IN A  209.12.95.102




dig ns @bbnona4  myfsi.hp.com


;; ANSWER SECTION:
myfsi.hp.com.           8H IN CNAME     www.myfsi.com.
www.myfsi.com.          22m50s IN CNAME 
myfsi.com.              11h46m48s IN NS  NS2.DATARETURN.com.
myfsi.com.              11h46m48s IN NS  NS1.DATARETURN.com.

;; ADDITIONAL SECTION:
NS2.DATARETURN.com.     1d23h32s IN A   209.12.95.102
NS1.DATARETURN.com.     1d23h32s IN A   209.12.95.2


The difference is that i get the A record for the name if
it was in the cache of the server. So during the resolution
if my nameserver is unable to acces the  myfsi.com. root
nameserver it will works with a 4.9 nameserver just because
it is requesting ANY record to the hp.com root and get 
the ip address because it was in the cache.
Unfortunatly now bind 8 seems to request NS only and
i don't have this nice 'side effect' allowing me
to resolve addresses even if i can not reach the final
nameserver.

Is there any option to turn this on again ? 


Antoine