NTP clients

[Susan Pellerito]

Is there a way to determine which servers are using the NTP server to sync their time?

[Michael Steele_2]

ntpq -p from clients. refer to table 4 -7 in this link:

Table 4-7. An ntpq Output Indicating Known NTP Hosts


remote refid st t when poll reach delay offset disp==================================================================*GPS_HP(1) GPS 0 l 48 64 377 0.00 0.516 4.19hpps.cup.hp cupertino 3 u 467 1024 377 7.20 -12.430 15.67+server2 WWVB 1 u 173 256 377 279.95 20.56 16.40+node1 node3 2 u 131 256 373 9.89 16.28 23.25

http://docs.hp.com/en/B2355-90774/ch04s02.html

[James R. Ferguson]

Hi Susan:

# ntpq -pn

...see the manpages for more information. An asterisk ("*") in column-1 denotes the server to which synchronization has occured.

Regards!

...JRF...

[Susan Pellerito]

Thanks for your suggestions, however, these commands only return the peers. I was looking for a way to determine what 'clients' are using my ntp server to sync time from.

[Steven E. Protter]

Shalom,

You can also look at /etc/ntp.conf

That will tell you what machine you INTEND to use. Compare it to the ntpq output and see whats going on.

I've found older versions of HP-UX have difficulty correcting time that is off by more than an hour with NTP. This may be a patching issue, have not had time to explore it.

SEP

[Susan Pellerito]

Sorry...NO this is not what I am looking for. I want to know who is using MY time to sync from.

[Deoncia Grayson_1]

One way, which is sure to be the long way around is going to the clients and looking at their /etc/ntp.conf and see which server they are using to sync their time.

[spex]

Susan,

You could try turning up the daemon logging level in /etc/syslog.conf, and then consult syslog after a client syncs to your server. Having never run an NTP server under HP-UX, I'm not sure that this will work.

Or write a script/program which monitors 123/udp.

PCS

[Hemmetter]

Hi Susan

You can try to catch ntpclients with
tcpdump:

> tcpdump -n udp port ntp


Rgds
HGH

[Susan Pellerito]

I am not familiar with tcpdump. Is this freeware and is there a version for HP-UX?

[spex]

http://hpux.connect.org.uk/hppd/hpux/Networking/Admin/tcpdump-3.9.4/

[Michael Steele_2]

Tcpdump may not be the best internet sniffer or network monitor. A better GNU sniffer might be 'etheral':

http://www.ethereal.com/

or 'snort':

http://gatekeep.cs.utah.edu/hppd/cgi-bin/search?package=on&description=on&term=sniffer

These are just suggestions to the subject of network sniffers and monitors. And of course, the best ones cost and often appear on network nodes, ie routers.

[BUPA IS]

Hello Susan

try xntpdc -c monlist
or if you want lots more try the -d (debug option )on the xntpd start command this comes out to your root screen however which may have nuisance value

good luck
Mike