[ntp:questions] ntp pool servers disappear - more data

David Woolley david at ex.djwhome.demon.invalid
Sat Jun 26 09:39:15 UTC 2021


On 26/06/2021 00:12, William Unruh wrote:
> Not at all sure what you are suggesting. DNS is a way of translating
> names to IP addresses, which your machine MUST use to talk to a remote

As already noted, there is no MUST about it.  I'd put it as low as MAY, 
and it is definitely no more than SHOULD.

> machine not on your network. The remote machine has nothing to do with

DNS can be used for local network machines, as well, and this is very 
common.

> this. Now some remote machines will as for the name associated with the
> IP address of machines sending the remote machine a query, to try to see
> if someone is spoofing the IP address, but as far as I know ntpd does
> not do that. Takes too much time and would make the time responses
> really bad.

  ntpd doesn't care about who is sending it a query, and, in any case 
reverse DNS lookups often provide bad results, which won't match the 
preferred forward lookup, in the real world.



More information about the questions mailing list