https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=283116
Bug ID: 283116
Summary: ntpd doesn't sync with any NTP servers on IPv6-Only
host
Product: Base System
Version: 14.2-RELEASE
Hardware: arm64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: [email protected]
Reporter: [email protected]
After OS upgrade RELEASE 14.1 -> 14.2 ntpd doesn't sync with any NTP servers on
IPv6-Only host (arm64). IPv4+IPv6 hosts (amd64) successfully syncs with ipv6
and ipv4 servers.
Observed behavior via tcpdump:
The host sends and receives AAAA DNS requests to get available ipv6 NTP servers
addresses.
The IPv6 NTP send/receive traffic is present, while ntpd is running (no other
ntp software is active).
But the ntpd state keeps running in unsynced state (observed for more than 1
hour):
# ntpq -nc peers
remote refid st t when poll reach delay offset jitter
==============================================================================
0.freebsd.pool. .POOL. 16 p - 64 0 0.000 +0.000 0.000
2.freebsd.pool. .POOL. 16 p - 64 0 0.000 +0.000 0.000
# ntptime
ntp_gettime() returns code 5 (ERROR)
time eafa82ab.8361f000 Wed, Dec 4 2024 9:26:35.513, (.100513213),
maximum error 16409000 us, estimated error 16000000 us, TAI offset 0
ntp_adjtime() returns code 5 (ERROR)
modes 0x0 (),
offset 0.000 us, frequency 6.607 ppm, interval 4 s,
maximum error 16409000 us, estimated error 16000000 us,
status 0x41 (PLL,UNSYNC),
time constant 3, precision 0.000 us, tolerance 496 ppm,
pps frequency 6.607 ppm, stability 0.000 ppm, jitter 0.000 us,
intervals 0, jitter exceeded 0, stability exceeded 0, errors 0.
No errors or warnings is reported by ntpd via syslog (like "error resolving
pool").
Sample NTP traffic:
# tcpdump -n -p -v port ntp
tcpdump: listening on vtnet0, link-type EN10MB (Ethernet), snapshot length
262144 bytes
09:27:03.286586 IP6 (class 0xb8, hlim 64, next-header UDP (17) payload length:
56) <Host IPv6>.123 > 2a01:4f9:c012:46b2::123.123: [bad udp cksum 0xa92a ->
0x228a!] NTPv4, Client, length 48
Leap indicator: clock unsynchronized (192), Stratum 0 (unspecified),
poll 6 (64s), precision -23
Root Delay: 0.000000, Root dispersion: 0.000000, Reference-ID: (unspec)
Reference Timestamp: 0.000000000
Originator Timestamp: 0.000000000
Receive Timestamp: 0.000000000
Transmit Timestamp: 3942286023.286500161 (2024-12-04T07:27:03Z)
Originator - Receive Timestamp: 0.000000000
Originator - Transmit Timestamp: 3942286023.286500161
(2024-12-04T07:27:03Z)
09:27:03.287801 IP6 (hlim 56, next-header UDP (17) payload length: 56)
2a01:4f9:c012:46b2::123.123 > <Host IPv6>.123: [udp sum ok] NTPv4, Server,
length 48
Leap indicator: (0), Stratum 3 (secondary reference), poll 6 (64s),
precision -24
Root Delay: 0.002014, Root dispersion: 0.000717, Reference-ID:
0xc2643197
Reference Timestamp: 3942285568.890700930 (2024-12-04T07:19:28Z)
Originator Timestamp: 3942286023.286500161 (2024-12-04T07:27:03Z)
Receive Timestamp: 3942286022.776204334 (2024-12-04T07:27:02Z)
Transmit Timestamp: 3942286022.776319710 (2024-12-04T07:27:02Z)
Originator - Receive Timestamp: -0.510295826
Originator - Transmit Timestamp: -0.510180450
09:27:04.231791 IP6 (class 0xb8, hlim 64, next-header UDP (17) payload length:
56) <Host IPv6>.123 > 2a01:4f9:3081:399c::4.123: [bad udp cksum 0x0b64 ->
0x66b9!] NTPv4, Client, length 48
Leap indicator: clock unsynchronized (192), Stratum 0 (unspecified),
poll 6 (64s), precision -23
Root Delay: 0.000000, Root dispersion: 0.000000, Reference-ID: (unspec)
Reference Timestamp: 0.000000000
Originator Timestamp: 0.000000000
Receive Timestamp: 0.000000000
Transmit Timestamp: 3942286024.231696767 (2024-12-04T07:27:04Z)
Originator - Receive Timestamp: 0.000000000
Originator - Transmit Timestamp: 3942286024.231696767
(2024-12-04T07:27:04Z)
09:27:04.235382 IP6 (flowlabel 0x7f2fc, hlim 57, next-header UDP (17) payload
length: 56) 2a01:4f9:3081:399c::4.123 > <Host IPv6>.123: [udp sum ok] NTPv4,
Server, length 48
Leap indicator: (0), Stratum 3 (secondary reference), poll 6 (64s),
precision -25
Root Delay: 0.004394, Root dispersion: 0.000991, Reference-ID:
0xc8634fed
Reference Timestamp: 3942285499.520158031 (2024-12-04T07:18:19Z)
Originator Timestamp: 3942286024.231696767 (2024-12-04T07:27:04Z)
Receive Timestamp: 3942286023.724094255 (2024-12-04T07:27:03Z)
Transmit Timestamp: 3942286023.724137758 (2024-12-04T07:27:03Z)
Originator - Receive Timestamp: -0.507602511
Originator - Transmit Timestamp: -0.507559008
09:27:05.230506 IP6 (class 0xb8, hlim 64, next-header UDP (17) payload length:
56) <Host IPv6>.123 > 2606:4700:f1::1.123: [bad udp cksum 0xe040 -> 0xf216!]
NTPv4, Client, length 48
Leap indicator: clock unsynchronized (192), Stratum 0 (unspecified),
poll 6 (64s), precision -23
Root Delay: 0.000000, Root dispersion: 0.000000, Reference-ID: (unspec)
Reference Timestamp: 0.000000000
Originator Timestamp: 0.000000000
Receive Timestamp: 0.000000000
Transmit Timestamp: 3942286025.230409312 (2024-12-04T07:27:05Z)
Originator - Receive Timestamp: 0.000000000
Originator - Transmit Timestamp: 3942286025.230409312
(2024-12-04T07:27:05Z)
09:27:05.232203 IP6 (flowlabel 0x7bc5b, hlim 57, next-header UDP (17) payload
length: 56) 2606:4700:f1::1.123 > <Host IPv6>.123: [udp sum ok] NTPv4, Server,
length 48
Leap indicator: (0), Stratum 3 (secondary reference), poll 6 (64s),
precision -25
Root Delay: 0.006256, Root dispersion: 0.000198, Reference-ID:
0x0a4f0920
Reference Timestamp: 3942285853.275892145 (2024-12-04T07:24:13Z)
Originator Timestamp: 3942286025.230409312 (2024-12-04T07:27:05Z)
Receive Timestamp: 3942286024.720292848 (2024-12-04T07:27:04Z)
Transmit Timestamp: 3942286024.720433025 (2024-12-04T07:27:04Z)
Originator - Receive Timestamp: -0.510116463
Originator - Transmit Timestamp: -0.509976287
09:27:06.283868 IP6 (class 0xb8, hlim 64, next-header UDP (17) payload length:
56) <Host IPv6>.123 > 2001:67c:164:200::184:123.123: [bad udp cksum 0x9ed0 ->
0xe924!] NTPv4, Client, length 48
Leap indicator: clock unsynchronized (192), Stratum 0 (unspecified),
poll 6 (64s), precision -23
Root Delay: 0.000000, Root dispersion: 0.000000, Reference-ID: (unspec)
Reference Timestamp: 0.000000000
Originator Timestamp: 0.000000000
Receive Timestamp: 0.000000000
Transmit Timestamp: 3942286026.283772916 (2024-12-04T07:27:06Z)
Originator - Receive Timestamp: 0.000000000
Originator - Transmit Timestamp: 3942286026.283772916
(2024-12-04T07:27:06Z)
09:27:06.285732 IP6 (flowlabel 0xa1bf5, hlim 56, next-header UDP (17) payload
length: 56) 2001:67c:164:200::184:123.123 > <Host IPv6>.123: [udp sum ok]
NTPv4, Server, length 48
Leap indicator: (0), Stratum 2 (secondary reference), poll 6 (64s),
precision -25
Root Delay: 0.001174, Root dispersion: 0.001037, Reference-ID:
0xc26402c2
Reference Timestamp: 3942285199.430308981 (2024-12-04T07:13:19Z)
Originator Timestamp: 3942286026.283772916 (2024-12-04T07:27:06Z)
Receive Timestamp: 3942286025.773833398 (2024-12-04T07:27:05Z)
Transmit Timestamp: 3942286025.773961652 (2024-12-04T07:27:05Z)
Originator - Receive Timestamp: -0.509939518
Originator - Transmit Timestamp: -0.509811264
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