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Subject: [Bug 270536] By default ntpd does not work on IPv6-only hosts
Date: Thu, 30 Mar 2023 07:58:59 +0000
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X-Bugzilla-Type: new
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: conf
X-Bugzilla-Version: 13.1-RELEASE
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X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: lapo@lapo.it
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D270536
Bug ID: 270536
Summary: By default ntpd does not work on IPv6-only hosts
Product: Base System
Version: 13.1-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: conf
Assignee: bugs@FreeBSD.org
Reporter: lapo@lapo.it
Default /etc/ntp.conf uses the following server:
pool 0.freebsd.pool.ntp.org iburst
which does not resolve to any IPv6 addresses:
% drill aaaa 0.freebsd.pool.ntp.org
;; ANSWER SECTION:
while 2 does:
% drill aaaa 2.freebsd.pool.ntp.org
;; ANSWER SECTION:
2.freebsd.pool.ntp.org. 150 IN AAAA 2620:83:8000:ffd1:1::e
2.freebsd.pool.ntp.org. 150 IN AAAA=20=20=20
2601:603:b7f:9731:123:4636:ddb5:5de
2.freebsd.pool.ntp.org. 150 IN AAAA 2604:a880:1:20::8e:3001
2.freebsd.pool.ntp.org. 150 IN AAAA 2620:149:a0c:4000::1f2
I discovered about that on the following thread:
https://community.ntppool.org/t/the-time-has-come-we-must-enable-ipv6-entir=
ely/1968/44?page=3D3
I'd say it would make sense to either:
1. switch entierly from 0. to 2. in order to support IPv6, but risking prob=
lems
on server which have IPv6 mis-configured
2. use both 0. and 2. in default ntp.conf, thus guaranteeing both IPv4-only
answers and IPv4+IPv6 answers, ntpd will then choose the best/closest one
anyways
cheers,
Lapo
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