See NTP clients that connect to my NTP server

[dragana s-v]

Hi,
Few of my boxes are set up as NTP servers. I was asked to provide list of all devices that connect to those servers to retrieve time. Does anyone know how can get this be done?

Thank you,
Dragana S-V

[Court Campbell]

I don't know of any command that will supply this for you. But you could install tcpdump and run it for awhile. Just have it look for things that come over port 123.

[B. Hulst]

Hi,

The quickest way is to monitor UDP port 123 on your system (with nettl,tcpdump or ethereal/wireshark) or check the logs on the firewall(s) in your network.

Regards,
Bob

[A. Clay Stephenson]

One approach would be to disable the HP supplied xntpd daemon and replace it with ntpd that you can get from here:
http://www.ntp.org/

The package is distributed as source and you can customize it to meet any need you have.
It's actually an easy build as long as you have a development system on your box.

[Court Campbell]

if you do as ACS suggests I believe you can do a

# ntpdc monlist

to get the list.