[Ntp] Antw: Re: Antw: Re: Antw: [EXT] Local time in NTPv5?

>>> Miroslav Lichvar <mlichvar@redhat.com> schrieb am 01.08.2022 um 10:13 in
Nachricht <YueLQCmfWv2qndXh@localhost>:
> On Fri, Jul 29, 2022 at 09:27:41AM ‑0700, Hal Murray wrote:
>> Is there a tool for poking at DHCP servers to see what they provide?  I 
> poked 
>> around a bit but diddn't find one.
>> 
>> I scanned the man page for the ISC DHCP server and didn't find any mention

> of 
>> NTP or time zones.  (ntp was mentioned as a logging option.)
> 
> It seems to be configured by the pcode option, documented in
> dhcp‑options(5).
> 
> With dnsmasq it's enabled by dhcp‑option=100,"...".
> 
>> If a client gets its IP Address from a server, does it latch on to that 
> server 
>> and ignore others?
> 
> I think it depends on the system/client. The scripts that some Linux
> distributions have add the NTP servers from DHCP to the existing
> NTP configuration and there is an option to specify the NTP server
> options, so the servers from DHCP could be trusted or preferred over
> the others servers.
> 
>> Or will it try broadcasting to find other servers before 
>> giving up?  Can we setup a DHCP server that only provides time zone info?

Maybe there should be DHCP options for NTP pool servers (DNS names to resolve)
or multicast/manycast addresses to use (maybe DNS names, too).

Regards,
Ulrich

> 
> ‑‑ 
> Miroslav Lichvar
> 
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