interface ignore wildcard
interface listen <local_nic_ip>

5:udp        0      0 <local_nic_ip>:123       0.0.0.0:*                           9172/ntpd
6:udp        0      0 127.0.0.1:123           0.0.0.0:*                           9172/ntpd
8:udp6       0      0 ::1:123                 :::*                                9172/ntpd

/usr/sbin/ntpd -p /var/run/ntpd.pid -g -u 121:130

NTPD_OPTS='-g'

NTPD_OPTS='-4 -g'

interface ignore wildcard
interface listen <local_nic_ip>

# netstat -anp | grep :123
udp    0      0 192.168.0.38:123     0.0.0.0:*                 2901/ntpd
udp    0      0 127.0.0.1:123        0.0.0.0:*                 2901/ntpd

listen on 127.0.0.1

listen on <local_nic_ip>

# netstat -anp | grep :123
udp   0    0 192.168.0.38:123     0.0.0.0:*                 8581/ntpd
udp   0    0 127.0.0.1:123        0.0.0.0:*                 8581/ntpd