Can I use my Asus 68U router as a NTP time source for my LAN

[Bruce_H]

I am running Asuswrt-Merlin firmware on my RT-AC68U router, and I am wondering if it is possible to have my internal Network devices use the router as a NTP time source since it is already syncing to an external time source (pool.ntp.org). If so then where can I find information on how to do this?

Thanks
Bruce H.

 

[Martineau]

....where can I find information on how to do this?

There are different options depending on which version of ntpd you wish to use ranging from using the built-in Busybox version (/usr/sbin/ntpd --help) i.e. simply edit

/jffs/scripts/services-start

/usr/sbin/ntpd -l

or installing @kvic's ntpd (Tools - NTP Daemon Performance Stats GUI optional) or the FULL ntpd from Entware.

This thread should give you comprehensive details including a link to Kvic's ntpd project and example scripts etc.
https://www.snbforums.com/threads/ntp-server.34828/#post-282020

 

[joegreat]

I use this setup and it works like a charm for all my local PCs.

 

[swetoast]

https://github.com/RMerl/asuswrt-merlin/wiki/Setting-up-a-NTP-Server-for-your-local-lan

began with a wiki article seen this question turn up from time to time so thought it might be better to make it into a wiki page, feel free to improve upon it.

 

[unsynaps]

Bad idea to do this as most (none?) of the asus routers have battery backup.

Last thing you want is a client syncing when the router is restarting and it hasent set its time yet.

 

[joegreat]

Bad idea to do this as most (none?) of the asus routers DO NOT have battery backup.

Last thing you want is a client syncing when the router is restarting and it hasent set its time yet.

Yep, but therefore I start the NTP server only AFTER the router has synced the time...

 

[Martineau]

https://github.com/RMerl/asuswrt-merlin/wiki/Setting-up-a-NTP-Server-for-your-local-lan

began with a wiki article seen this question turn up from time to time so thought it might be better to make it into a wiki page, feel free to improve upon it.

Perhaps it would be prudent to address concerns and follow the advice of @joegreat

https://www.snbforums.com/threads/c...ntp-time-source-for-my-lan.38370/#post-316684

and update the wiki

/jffs/scripts/srvices-start

if [ "$(nvram get ntp_ready)" == "1" ];then  # Only start the NTP server if router has itself synchronised with Internet
   ntpd   -l
else
   logger -st "($(basename $0))" $$ "***ERROR Router cannot get initialise NTP Server!"
fi

 

[swetoast]

done

 

[joegreat]

Perhaps it would be prudent to address concerns and follow the advice of @joegreat

https://www.snbforums.com/threads/c...ntp-time-source-for-my-lan.38370/#post-316684

and update the wiki

I am using a more advanced approach as outlined here - this ensures that the time IS REALLY set before the start of the NTP server - it's the first line in my S77ntpd-custom init script in /opt/etc/init.d

 

[dazedv3]

Bit of a thread dig here but I figured its better than making a new one.
I've followed all the steps from the wiki however the service doesn't appear to start on its own if the router is rebooted.

I'm using WinSCP and if I right click on the post-mount script and "execute" it I get this message

Command '"./post-mount"'
failed with return code 0 and error message
./post-mount: line 15: Internet: not found
(post-mount): 4364 ***SUCCESS Router copied
ntp.conf-file to /etc!
(post-mount): 4364 ***SUCCESS Router initialized NTP
Server!.
​

If i then set my Windows PC to use my routers IP for NTP it works.

However if I reset the router and try again on the Windows PC it will not work and i'd have to manually execute the post-mount script.

Any help would be appreciated thanks.