Kipróbáltam, nekem működik.
Szerver: Debian 12, ntpd ntpsec-1.2.2
Konfig:
server -4 time.xxx.hu iburst
disable stats
driftfile /var/lib/ntpsec/ntp.drift
restrict 127.0.0.1
restrict default kod limited nomodify noquery
Kliens: Debian 6, ntpd Ver. 4.2.6p2 (2015 októberi a bináris)
Konfig:
server debian12.xxx.hu
disable auth stats
driftfile /var/lib/ntp/ntp.drift
logfile /var/log/ntpd.log
restrict default kod notrap nomodify nopeer noquery limited
restrict 127.0.0.1
# ntpq -pn
remote refid st t when poll reach delay offset jitter
==============================================================================
*198.51.100.149 192.0.2.1 4 u 78 128 377 0.205 -0.004 0.014