NTP through DNS?
raubvogel at gmail.com
Fri Sep 21 19:57:09 UTC 2018
On Fri, Sep 21, 2018 at 3:14 PM, Danny Mayer <mayer at pdmconsulting.net> wrote:
> On 9/21/2018 7:56 AM, Ray Bellis wrote:
>> On 21/09/2018 12:47, Danny Mayer wrote:
>>> Putting on both my BIND9 and NTP hats for a moment:
>>> This answer makes no sense. NTP uses standard DNS FQDN's for all of its
>>> references to NTP servers whether it's using pool, server or peer. I
>>> have no idea where the reverse zone comes in though I haven't read the
>>> whole thread. the NTP service all belong to domains, whether internal or
>>> external. There is a DHCP option that we have seen but it seems to cause
>>> more confusion that anything.
>>> You can create a DNS A or AAAA or even a CNAME in your local DNS that
>>> the NTP server can use and it all works.
>>> Let me know if I misunderstood what this is really about.
>> I believe you have.
>> The discussion was about automated _discovery_ of the DNS name of your
>> NTP server using an additional level of indirection so that it can be
>> automatically configured without using DHCP.
> That's easy. Create a FQDN called ntp in your domain and have it be a
> set of CNAMES pointing to the ntp servers you want to use. The ntpd pool
> option will take care of setting the multiple servers. You don't need
> the complexity of SRV records.
But that is not, as Ray said, automated discovery. You are
asking the computer to make assumptions, i.e. "if I am in domain
hey.com, the ntp is ntp.hey.com." I am more on the lines of "hey
domain thingie. You know where a lot of your basic network resources
are. If you have a ntp server do you know where it is just like you
know where your mail, LDAP, and kerbie servers are hiding?"
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