[ntp:questions] Restrict accepts also hostname ?!

Steve Kostecke kostecke at ntp.isc.org
Wed Mar 14 12:17:08 UTC 2007

On 2007-03-14, RICCARDO <castellani.riccardo at tiscali.it> wrote:

> restrict ntp1.inrim.it nomodify noquery notrap nopeer
> [works]
> I found into this group that "restrict" requires only ipaddress but
> also with hostname I had no problems.

You _can_ use a host-name on a restrict line only _if_ that host-name
resolves to _one_ IP address.

You _can_ _not_ use a host-name that resolves to _multiple_ IP addresses
on a restrict line.

This is because the restrict line uses only the first IP address that is

This obviously rules out the use of pool.ntp.org host-names in restrict

Steve Kostecke <kostecke at ntp.isc.org>
NTP Public Services Project - http://ntp.isc.org/

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