I am using ntp 4.2.6p5 on linux.
I setup an NTP server on a machine in another subnet and tried to sync
my machine with the server and it works well. But when I try to use
the pool.ntp.org servers (I tried 0.pool.ntp.org, 1.pool.ntp.org, etc.
and just pool.ntp.org servers), it does not sync.
nslookup on pool.ntp.org as well as 0.pool.ntp.org gives proper DNS
resolution and ping works on the IPs returned by nslookup as well.
Output of iptables grepped for UDP is as follows:
[Thu Feb 10 12:39:14 root@root-ubuntu:~]# iptables -L -n -v | grep udp
92 13001 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0
state RELATED,ESTABLISHED
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0
udp dpt:123
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0
udp dpt:161
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0
udp dpt:443
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0
udp dpt:623
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0
udp dpt:389
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0
udp dpt:636
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0
udp dpt:3268
0 0 ACCEPT udp -- * * 0.0.0.0/0 0.0.0.0/0
udp dpt:3269
Output of the netstat command is as follows:
[Thu Feb 10 12:35:51 root@root-ubuntu:~]# netstat -a | grep udp
udp 0 0 localhost:9473 0.0.0.0:*
udp 0 0 0.0.0.0:asf-rmcp 0.0.0.0:*
udp 0 0 173.39.22.123:ntp 0.0.0.0:*
udp 0 0 localhost:ntp 0.0.0.0:*
udp 0 0 0.0.0.0:ntp 0.0.0.0:*
udp 0 0 all-systems.mcast.net:23000 0.0.0.0:*
udp 0 0 ::1:ntp ::%628620:*
udp 0 0 fe80::222:bdff:feea:9f1f:ntp ::%628620:*
udp 0 0 fe80::222:bdff:feea:9f20:ntp ::%628620:*
udp 0 0 :::ntp ::%628620:*
I am unable to figure out why the sync problem is happening only with
the pool servers and not the local server. The UDP ports in my system
is up. The servers are up. Time however does not sync (It is still
displaying Feb 10.)
Adding my .conf file:
driftfile /tmp/ntp.drift/
server 0.pool.ntp.org
server 1.pool.ntp.org
server 2.pool.ntp.org
server 3.pool.ntp.org
Adding ntpq -p data:
[Thu Feb 10 12:55:51 root@root-ubuntu:~]# ntpq -p 0.pool.ntp.org
remote refid st t when poll reach delay offset jitter
==============================================================================
*64.147.116.229 .ACTS. 1 u 151 1024 377 2.439 -0.632 0.052
+131.107.13.100 .ACTS. 1 u 879 1024 377 27.853 1.041 0.539
-time.nrc.ca 132.246.11.231 2 u 989 1024 377 86.821 -4.132 8.778
-time1.chu.nrc.c 209.87.233.52 2 u 53 1024 377 109.221 3.153 9.377
+dense.utcc.utor 128.100.200.166 2 u 88 1024 377 64.115 -1.841 0.454
-dns4.utoronto.c 128.100.103.253 2 u 167 1024 377 65.252 -43.422 56.093
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