Public bug reported:
The default ntp configuration that ships with ubuntu has ntp listening
on all interfaces when in most instances that's not needed. Adding the
line:
interface ignore wildcard
to ntp.conf disables this and makes ntp only listen to localhost, which
is enough for things like ntpq to still work. It would probably be even
safer for it not to listen on any interfaces but that doesn't seem to be
possible as "interface ignore all" seems to be completely ignored and
"interface ignore lo" only disables localhost on ipv6. It seems
listening to localhost on ipv4 is hardcoded into ntpd.
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: ntp 1:4.2.6.p2+dfsg-1ubuntu5.1
ProcVersionSignature: Ubuntu 2.6.38-11.48-generic 2.6.38.8
Uname: Linux 2.6.38-11-generic x86_64
Architecture: amd64
Date: Sat Sep 24 20:04:13 2011
EcryptfsInUse: Yes
ProcEnviron:
LANGUAGE=en_US:en
PATH=(custom, user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature_: Ubuntu 2.6.38-11.48-generic 2.6.38.8
SourcePackage: ntp
UpgradeStatus: Upgraded to natty on 2011-05-07 (140 days ago)
** Affects: ntp (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug natty
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https://bugs.launchpad.net/bugs/858493
Title:
By default ntpd listens on all interfaces
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