Day: August 23, 2026

Openwrt ntpd and ntpq time server

root@OpenWrt:~# ntpd -w -d -p 192.168.10.196
ntpd: sending query to 192.168.10.196
ntpd: reply from 192.168.10.196: offset:-0.002124 delay:0.010506 status:0x24 strat:1 refid:0x00535047 rootdelay:0.000000 reach:0x01
ntpd: sending query to 192.168.10.196
ntpd: reply from 192.168.10.196: offset:-0.001935 delay:0.008853 status:0x24 strat:1 refid:0x00535047 rootdelay:0.000000 reach:0x03
ntpd: sending query to 192.168.10.196
ntpd: reply from 192.168.10.196: offset:+0.003002 delay:0.008686 status:0x24 strat:1 refid:0x00535047 rootdelay:0.000000 reach:0x07


uci show system | grep ntp

cat /etc/config/system

/etc/init.d/sysntpd status

Usage: ntpd [-dnqNwl] [-I IFACE] [-S PROG] [-p PEER]...

NTP client/server

	-d[d]	Verbose
	-n	Run in foreground
	-q	Quit after clock is set
	-N	Run at high priority
	-w	Do not set time (only query peers), implies -n
	-S PROG	Run PROG after stepping time, stratum change, and every 11 min
	-p PEER	Obtain time from PEER (may be repeated)
	-l	Also run as server on port 123
	-I IFACE Bind server to IFACE, implies -l

Pi5 PTP clock – /dev/ptp0

  • Pi5 has ptp
root@lp-arm-5:~# ethtool -T eth0
Time stamping parameters for eth0:
Capabilities:
	hardware-transmit
	software-transmit
	hardware-receive
	software-receive
	software-system-clock
	hardware-raw-clock
Hardware timestamp provider index: 0
Hardware timestamp provider qualifier: Precise (IEEE 1588 quality)
Hardware Transmit Timestamp Modes:
	off
	on
	onestep-sync
Hardware Receive Filter Modes:
	none
	all

root@lp-arm-5:~# phc_ctl /dev/ptp0 get
phc_ctl[644486.511]: clock time is 1787465854.590438111 or Sun Aug 23 11:47:34 2026

root@lp-arm-5:~# phc_ctl /dev/ptp0 caps
phc_ctl[644504.310]: 
capabilities:
  64000000 maximum frequency adjustment (ppb)
  0 programable alarms
  0 external time stamp channels
  0 programmable periodic signals
  0 configurable input/output pins
  has pulse per second support
  doesn't have cross timestamping support
  doesn't have adjust phase support


root@lp-arm-5:~# date
sudo phc_ctl /dev/ptp0 get
sudo hwclock -r
Sun Aug 23 13:21:04 IST 2026
phc_ctl[645456.567]: clock time is 1787466824.601451911 or Sun Aug 23 12:03:44 2026

2026-08-23 13:21:04.580550+05:30