[Pdns-users] how to turn off "send-root-referral" for "norecurse" query

[XscapeMind]

Hi,
   I'm using pdns 2.9.22,  in a send-root-referral query case (when
return an external CNAME record), pdns always return root AUTHORITY
SECTION and ADDITIONAL SECTION if query is with norecurse flag, The
packet will easily exceed 512 bytes. Can I turn off that?

  dig +norec long-name.a.com     ( same as bind9 and pdns-recursor 's
recursive query)

  ;; ANSWER SECTION:
long-name.a.com. 60	IN	CNAME	long-name.external.com.

;; AUTHORITY SECTION:
.			518400	IN	NS	a.root-servers.net.
...
.			518400	IN	NS	m.root-servers.net.

;; ADDITIONAL SECTION:
a.root-servers.net.	3600000	IN	A	198.41.0.4
...
m.root-servers.net.	3600000	IN	A	202.12.27.33