ntpdc doesn't work as expect

[Pongthep Kulkrisada <ptkrisada%gmail.com@localhost>]

Hi all,

I'm not sure if this problem has been posted in this list. I didn't find it.
I found that ntpdc doesn't work, while ntpq works pretty fine.
I tested both on 6.1_STABLE and 7.0_RC2.
The results are the same. (I only tested on IPv4.)
Anyone have a clue, please point me out.
Thanks in advance,

Here's the output from 6.1_STABLE.

% uname -a
NetBSD netbsd.localdomain 6.1_STABLE NetBSD 6.1_STABLE (GENERIC) #2: Sat Aug  1 21:28:32 ICT 2015  root@netbsd.localdomain:/usr/obj/sys/arch/i386/compile/GENERIC i386
% cat /etc/rc.conf | grep ntpd
ntpdate=YES
ntpdate_flags="-b time.navy.mi.th asia.pool.ntp.org ntp.nict.jp"
ntpd=YES
% ntpq -p
     remote           refid      st t when poll reach   delay   offset  jitter
==============================================================================
+x2204.ipv9.xyz  202.47.249.21    2 u   70  128  377   10.279    0.309  31.508
*122.155.169.213 202.47.249.20    2 u    2  128  377    9.094    1.476   0.964
 2001:3c8:e10e:3 .INIT.          16 u    - 1024    0    0.000    0.000   0.000
% ntpdc -p
localhost.localdomain: timed out, nothing received
***Request timed out
%

-- 
Pongthep Kulkrisada
 
"Nothing ever exists entirely alone without relativity."