DHCP option 42 value present but not configured

RouterOS General
1

Confirmed on static lease

Option 42 is present in DHCP OFFER and is set to the router ntp client IP (/system ntp client).

Option 42 / ntp-server is not set on the static DHCP lease and not set in /ip dhcp-server network.

I don’t see anything in documentation or change log about DHCP using the router NTP IP(s) by default. Is this intended behavior?

Version 6.38.5

Thanks,

2

Hummm … 6.38.5 … seriously? How about you upgrading to some non-ancient version and checking again?

3

Fired up a 6.45.7 image.

Tested without router NTP client primary-ntp specified.
Resulted in no option 42 in DHCP offer.

Tested with router NTP client primary-ntp specified.
Resulted in option 42 present in DHCP offer.

If this is the intended behavior, is there a way to stop this?

4

In my case I have option ntp-server= explicitly set in /ip dhcp-server network … so what does show /ip dhcp-server network print detail? Anything about ntp-server there? If yes, can you set it to empty string?

5

/ip dhcp-server network is set to ntp-server=“”