[ntp:questions] Need help for IPv6 setup
Nicolas Braud-Santoni
nicolas.braudsantoni at gmail.com
Tue May 29 13:37:01 UTC 2012
Hi,
I noticed my NTP server isn't usable over IPv6, despite it being
pingable over IPv6.
I checked that it's not a firewall problem (actually disabled iptables
for checking this).
Here is ntp's configuration :
# /etc/ntp.conf, configuration for ntpd; see ntp.conf(5) for help
listen-on ipv4 accept
listen-on ipv6 accept
driftfile /var/lib/ntp/ntp.drift
# Peers[...]
setvar access_policy = "open access" default
restrict -4 default kod notrap nomodify nopeer noquery
restrict -6 default kod notrap nomodify nopeer noquery
# Local users may interrogate the ntp server more closely.
restrict 127.0.0.1
restrict ::1
Here is some relevant information :
# netstat -lp | grep ntp
udp 0 0 <mydomain>:ntp *:*
22047/ntpd
udp 0 0 localhost.localdoma:ntp
*:* 22047/ntpd
udp 0 0 *:ntp
*:* 22047/ntpd
udp6 0 0 [::]:ntp
[::]:* 22047/ntpd
# ntpd --version
ntpd - NTP daemon program - Ver. 4.2.6p2
Here is a test from another IPv6-enabled box :
# ping6 2001:41d0:8:12c7::dead:bebe
PING 2001:41d0:8:12c7::dead:bebe(2001:41d0:8:12c7::dead:bebe) 56 data
bytes
64 bytes from 2001:41d0:8:12c7::dead:bebe: icmp_seq=1 ttl=61
time=0.480 ms
64 bytes from 2001:41d0:8:12c7::dead:bebe: icmp_seq=2 ttl=61
time=0.334 ms
[...]
# ntpdate -qd 2001:41d0:8:12c7::dead:bebe
29 May 15:28:32 ntpdate[17761]: ntpdate 4.2.6p2 at 1.2194-o Sun Oct 17
13:35:14 UTC 2010 (1)
transmit(2001:41d0:8:12c7::dead:bebe)
transmit(2001:41d0:8:12c7::dead:bebe)
transmit(2001:41d0:8:12c7::dead:bebe)
transmit(2001:41d0:8:12c7::dead:bebe)
transmit(2001:41d0:8:12c7::dead:bebe)
2001:41d0:8:12c7::dead:bebe: Server dropped: no data
server 2001:41d0:8:12c7::dead:bebe, port 123
stratum 0, precision 0, leap 00, trust 000
refid [2001:41d0:8:12c7::dead:bebe], delay 0.00000, dispersion
64.00000
transmitted 4, in filter 4
reference time: 00000000.00000000 Mon, Jan 1 1900 0:09:21.000
originate timestamp: 00000000.00000000 Mon, Jan 1 1900 0:09:21.000
transmit timestamp: d36f4d87.176c5e40 Tue, May 29 2012 15:28:39.091
filter delay: 0.00000 0.00000 0.00000 0.00000
0.00000 0.00000 0.00000 0.00000
filter offset: 0.000000 0.000000 0.000000 0.000000
0.000000 0.000000 0.000000 0.000000
delay 0.00000, dispersion 64.00000
offset 0.000000
29 May 15:28:41 ntpdate[17761]: no server suitable for synchronization
found
The same thing happens in local, using either
2001:41d0:8:12c7::dead:bebe or ::1.
Would anyone have a clue ?
Thanks,
Nicolas
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