ntpd binds to all ldefined loopback addresses

[James B. Byrne]

I have encountered an issue with ntp on FreeBSD-11.  This may be
either a design feature or a bug; or just a misunderstanding on my
part.

The host in question has server jails running on it.  None of these
are running ntpd.  However, the host is and is configured to listen on
specific addresses:

# grep -i listen /etc/ntp.conf
### Set the listening addresses to avoid collisions with jails
interface listen 192.168.216.18
interface listen 216.185.71.18

However, when I do a sockstat I see this:

# sockstat -l | grep ntp
root     ntpd       11391 20 udp4   216.185.71.18:123     *:*
root     ntpd       11391 21 udp4   192.168.216.18:123    *:*
root     ntpd       11391 22 udp6   ::1:123               *:*
root     ntpd       11391 23 udp4   127.0.0.1:123         *:*
root     ntpd       11391 24 udp4   127.0.31.1:123        *:*
root     ntpd       11391 25 udp4   127.0.32.1:123        *:*
root     ntpd       11391 26 udp4   127.0.84.1:123        *:*

Despite being instructed to only listen on two addresses ntpd has
glommed every available loopback address.

Is this intentional?  if not then how does one configure ntp to only
listen on a specific lo address?  I have already tried specifying
'listen 127.0.0.1' and this produced no change in ntpd's observed
behaviour.


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James B. Byrne                mailto:ByrneJB at Harte-Lyne.ca
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