ntp servers

[Doug Barton]

On 10/07/2013 12:07 PM, Gary Johnson wrote:
> On 2013-10-07, Steven Carr wrote:
>
>> On 7 October 2013 01:01, Julie Xu <xll40 at hotmail.com> wrote:
>
>>> what is default for option ntp-servers? option 4 ? 42 ? or both?
>
>> NTP is option 42, option 4 is for the older time protocol.
>>
>> But the DHCP clients need to be configured to request/use that option.
>> This is usually the case on Linux, but on Windows if the client is a
>> member of Active Directory it will use the Domain Controller for time
>> sync. Supposedly if a Windows machine is not a member of AD it will
>> use option 42, but I've never seen that work. From what I've seen on
>> OS X setting NTP via DHCP isn't supported.
>
> I believe NTP is 56.  42 is the TZDB Timezone option, and 41 is the
> POSIX Timezone option.

There is no need to guess :)


https://www.iana.org/assignments/bootp-dhcp-parameters/bootp-dhcp-parameters.xhtml#options