NTP - how to force synchronization without an association?

[habyor]

Hello,

the HP-UX troubleshooting NTP documentation says that:

"
Every NTP time hierarchy must have at least one stratum-1 server,
with an external time source configured, either an attached radio clock
or the local system clock. If there is no stratum-1 server in the hierarchy,
no associations will be formed.
"

Is it possible to force NTP client to synchronize its time with a local (LAN)
NTP server despite the fact there is no stratum-1 server in the hierarchy?

I have a local (LAN) NTP server. When I type ntpq -p, it shows this:

remote refid st t when poll reach delay offset jitter
==============================================================================
ixi26.internetd .INIT. 16 u - 1024 0 0.000 0.000 0.000
ntp.ipartners.p .INIT. 16 u - 1024 0 0.000 0.000 0.000
vega.cbk.poznan .INIT. 16 u - 1024 0 0.000 0.000 0.000
smtp.certum.pl .INIT. 16 u - 1024 0 0.000 0.000 0.000
europium.canoni .INIT. 16 u - 1024 0 0.000 0.000 0.000

There is no '*' in the remote column, meaning there is no associacion.

When I type ntpq -p from my HP-UX client, it shows this:

remote refid st t when poll reach delay offset disp
==============================================================================
repepwd 0.0.0.0 16 u 5 64 0 0.00 0.000 16000.0

where repepwd is the local NTP server I want to synchronize with. There is
also no '*' in the remote column.

When I stop xntpd on the HP-UX client, and try sync the time by typing
"ntpdate repepwd", it shows this error message:

10 Dec 14:19:51 ntpdate[5250]: no server suitable for synchronization found

Do I understand correctly that it's because of the missing association?
If so, can I force NTP client to ignore the fact there is no stratum-1
server in the hierarchy?

Thanks in advance for any help.

Greetings,
Tomek.

[Johnson Punniyalingam]

how about try with ip address

ntpdate

[James R. Ferguson]

Hi:

Synchronization will fail if your server's time is more than ~ 1000 seconds wrong. Verify that your server's time is correct with:

# date -u

If not, adjust it. If you need to set the server's time backwards, either reboot or stop time-sensitive processes like databases. Moving time forward is usually not a problem.

Regards!

...JRF...

[Johnson Punniyalingam]

suggesting that the problem may be related to busy or remote network

ntpdate -b -t 4 -p 4

-t 4 sets the timeout to 4 seconds (from 1, "suitable for LAN applicatons") and -p 8 sets the number of averaged samples back to the default, After the initial ntpdate config, everything will sync up with ntpq which defaults to 5000 msec

[habyor]

The time difference between the NTP server and the HP-UX client is only about 4 minutes.

Trying ntpdate returns the same error message:

10 Dec 15:03:33 ntpdate[5559]: no server suitable for synchronization found

The same error message appears when I try:

ntpdate -b -t 4 -p 4 repepwd

or

ntpdate -b -t 4 -p 4

Am I wrong thinking that it's a problem with a missing associacion?

Tomek.

[habyor]

PS. ping repepwd shows very fast replies:

PING repepwd: 64 byte packets
64 bytes from 172.26.0.100: icmp_seq=0. time=0. ms
64 bytes from 172.26.0.100: icmp_seq=1. time=0. ms
64 bytes from 172.26.0.100: icmp_seq=2. time=0. ms
...

Tomek.

[Julián Aimar]

Hi, can you paste output

# telnet 123

tks

[habyor]

Bingo, telnet can't connect on port 123:

telnet repepwd 123
Trying...
telnet: Unable to connect to remote host: Connection refused

On repepwd in ntp.conf there is a line:

restrict 172.27.0.0 mask 255.255.255.128 nomodify notrap

but apparently it's not enough or there is some error I can't see. 255.255.255.128 is the netmask of the HP-UX
client.

[Julián Aimar]

give me the points.... hahahaha

Saludos

JEA

[habyor]

Points granted, still I don't know why it is refusing connections on port 123.

There is no firewall on repepwd, and netstat shows
that port 123 is open:

udp 0 0 172.26.0.100:123 0.0.0.0:*
udp 0 0 127.0.0.1:123 0.0.0.0:*
udp 0 0 0.0.0.0:123 0.0.0.0:*
udp6 0 0 fe80::21d:7dff:fe0d:123 :::*
udp6 0 0 ::1:123 :::*
udp6 0 0 :::123 :::*

When I try ntpdate repepwd, it gives me the same error:

# ntpdate -b -t 4 -p 4 172.26.0.100
10 Dec 16:37:05 ntpdate[6320]: no server suitable for synchronization found