[Bug 1077003] Re: ntp ignores config option interface ignore all

[Michael Weyershäuser]

Hi,

my expectation was that the ntp process does not open a port on any interface 
but localhost.
The use case is to use the ntp daemon to permanently synchronize the time with 
a central time server, but not to serve the time to any other host.

The interface option is defined in the nat.conf man page. However, when
I double checked it today to add a link to this bug I saw that this was
the manpage for precise (where ntpd works as I expected it). In the man
page for lucid there is no sign of the interface option.

So I guess this option was added somewhere between lucid and precise by
the ntp developers. Sorry for not double checking this before opening a
bug...

I marked the bug as invalid.

Regards,
Michael

** Changed in: ntp (Ubuntu)
   Status: Incomplete = Invalid

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Title:
  ntp ignores config option interface ignore all

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[Bug 1077003] [NEW] ntp ignores config option interface ignore all

[Michael Weyershäuser]

Public bug reported:

Hi,

if I add a line like interface ignore all to /etc/ntp.conf in Ubuntu
10.04 and restart the ntp service, it will still listen on all
interfaces. We have two ntp servers running in our environment, all
other servers should just use ntp to synchronise time with them. Because
of this bug we actually have several hundred ntp servers on our
virtualized web servers.

This seems to be fixed in 12.04. If I add the line there, ntp only
listens on the localhost interface.

Full ntp.conf:

tinker panic 0
tinker step 0
driftfile /var/lib/ntp/ntp.drift
# Enable this if you want statistics to be logged.
#statsdir /var/log/ntpstats/
statistics loopstats peerstats clockstats
filegen loopstats file loopstats type day enable
filegen peerstats file peerstats type day enable
filegen clockstats file clockstats type day enable
server 10.30.1.80 minpoll 4 maxpoll 4
server 10.30.1.81 minpoll 4 maxpoll 4
server 10.30.1.82 minpoll 4 maxpoll 4
interface ignore all

Package version:
apt-cache policy ntp
ntp:
  Installiert: 1:4.2.4p8+dfsg-1ubuntu2.1


Regards,

Michael

** Affects: ntp (Ubuntu)
 Importance: Undecided
 Status: New

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https://bugs.launchpad.net/bugs/1077003

Title:
  ntp ignores config option interface ignore all

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