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how to reduce ntpd polling cycle in OpenNTPd



G'Day,
Is there a way to reduce the interval NTPD polls for time updates?
I have installed 3.7 and have determined NTPD is contacting the time server approx. 30sec. My normal configuration in 3.4 was to configure /etc/ntpd.conf with 5 time servers and turn NTPD loose. If I do that now the server has port 123 connections open all the time.
Once the servers time is sync doesn't the polling interval reduce? Shouldn't it start fairly short and then slowly over time extends out longer? Do I have something mis-configured.
Enclosed is a tcpdump trap.


17:24:49.475688 www.xxx.yyy.zzz.12962 > 205.200.28.12.ntp: v4 client strat 0 poll 0 prec 0 [tos 0x10]
17:24:49.492933 205.200.28.12.ntp > www.xxx.yyy.zzz.12962: v4 server strat 2 poll 4 prec -18
17:25:19.654486 www.xxx.yyy.zzz.12962 > 205.200.28.12.ntp: v4 client strat 0 poll 0 prec 0 [tos 0x10]
17:25:19.671212 205.200.28.12.ntp > www.xxx.yyy.zzz.12962: v4 server strat 2 poll 4 prec -18
17:25:52.821278 www.xxx.yyy.zzz.12962 > 205.200.28.12.ntp: v4 client strat 0 poll 0 prec 0 [tos 0x10]
17:25:52.837745 205.200.28.12.ntp > www.xxx.yyy.zzz.12962: v4 server strat 2 poll 4 prec -18
17:26:24.992076 www.xxx.yyy.zzz.12962 > 205.200.28.12.ntp: v4 client strat 0 poll 0 prec 0 [tos 0x10]
17:26:25.008846 205.200.28.12.ntp > www.xxx.yyy.zzz.12962: v4 server strat 2 poll 4 prec -18


	
Only line in the /etc/ntpd.conf
server 205.200.28.12

Sean