[ntp:questions] no server suitable for synchronization found

Jess Magnaye jmagnaye at prominencenet.com
Mon Nov 8 16:11:15 UTC 2004


I've been trying to resolve the above issue on my RH9 Linux.  I double
checked other mailing lists about possible solution but none of them worked.
I hope I have reached the right mailing list.

I have 3 linux machines, with one running the NTP daemon (/etc/init.d/ntpd).
The other 2 are just updating its time using ntpdate command.  details are
written below:

192.168.30.30 (with ntpd)
192.168.29.30 (using ntpdate)
192.168.25.30 (using ntpdate)

the 29.30 and 25.30 machines are behind the same router that is connected to
30.30 on a separate router via serial (1T).  all of them can ping each
other.  no firewall is enabled on the network. in fact, when a router is
setup as ntp server, all of them can sync with its clock.  i even tried
synching 29.30 and 25.30 to a public time server and it worked. i just
cannot figure out why it cannot synch with my 30.30.

30.30 has /etc/ntp.conf as follows:
------------------------------------
restrict default ignore
restrict 127.0.0.1
restrict 192.168.0.0 mask 255.255.255.0 notrust nomodify notrap
server  127.127.1.0     # local clock
fudge   127.127.1.0 stratum 10
driftfile /etc/ntp/drift
broadcastdelay  0.008
authenticate yes
keys	/etc/ntp/keys

29.30 and 25.30 has /etc/ntp.conf as follows:
----------------------------------------------
restrict default ignore
restrict 127.0.0.1
server  192.168.30.30
driftfile /etc/ntp/drift
broadcastdelay  0.008
authenticate yes
keys	/etc/ntp/keys

when i run ntpdate from 29.30 and 25.30, server is not replying back. i see
the requests though using tcpdump on 30.30.

 8 Nov 11:03:38 ntpdate[22288]: ntpdate 4.1.1c-rc1 at 1.836 Thu Feb 13 12:17:20
EST
 2003 (1)
transmit(192.168.30.30)
transmit(192.168.30.30)
transmit(192.168.30.30)
transmit(192.168.30.30)
transmit(192.168.30.30)
192.168.30.30: Server dropped: no data
server 192.168.30.30, port 123
stratum 0, precision 0, leap 00, trust 000
refid [0.0.0.0], delay 0.00000, dispersion 64.00000
transmitted 4, in filter 4
reference time:    00000000.00000000  Thu, Feb  7 2036  1:28:16.000
originate timestamp: 00000000.00000000  Thu, Feb  7 2036  1:28:16.000
transmit timestamp:  c53a1778.ce842741  Mon, Nov  8 2004 11:04:08.806
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

 8 Nov 11:04:18 ntpdate[22288]: no server suitable for synchronization found


tcpdump from 30.30 is as follows:
----------------------------------

#tcpdump -vvv -i eth0 port 123
tcpdump: listening on eth0
11:09:01.789218 192.168.29.30.49095 > lab12md3030.ntp: [udp sum ok]  v4
client s
trat 0 poll 4 prec -6 dist 1.000000 disp 1.000000 ref (unspec)@0.000000000
orig
0.000000000 rec -0.000000000 xmt -986048510.973299980 (DF) (ttl 58, id 0,
len 76
)
11:09:11.789286 192.168.29.30.49095 > lab12md3030.ntp: [udp sum ok]  v4
client s
trat 0 poll 4 prec -6 dist 1.000000 disp 1.000000 ref (unspec)@0.000000000
orig
0.000000000 rec -0.000000000 xmt -986048500.973263025 (DF) (ttl 58, id 0,
len 76
)



I appreciate any help.  Looking forward to your answers.  Thank you.




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