Tracking NTP Clients


 
Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users Tracking NTP Clients
# 1  
Old 10-03-2008
Tracking NTP Clients

I need to find out the NTP Clients which are syncing with my NTP Server in a Unix(Linux/Solaris) Machine. For eg. How many Stratum 2 Servers sync the time with my Stratum1 Server. Is there any way to track it?

edit by bakunin: moving the thread to where it belongs: the technical forums.

Last edited by bakunin; 10-04-2008 at 07:17 AM..
# 2  
Old 10-07-2008
Hrm, well, it would appear that ntpd 4.2.2p1 does not log enough info. It sends log info to syslog, but that seems to report only startup/shutdown/error info (even with "debug" level captured). I added the logfile option and got a status report in the logfile every time ntpd connected to an upstream stratus server.
Code:
 7 Oct 11:47:16 ntpd[32403]: synchronized to 193.79.237.14, stratum 1

But it never reported when it was used as a stratus server.

Patching the source code might be in order.

Last edited by otheus; 10-07-2008 at 06:56 AM.. Reason: i tested "Debug" level for syslog+ntp
# 3  
Old 10-07-2008
You can also turn on IP filtering/logging to log incoming packets to port 123. Both Solaris IPF and Linux iptables support this feature. It won't tell you what stratum were used, but you might be able to figure that out from the packet headers and set the filters appropriately.
# 4  
Old 10-12-2008
Use the ntpdc command:

Code:
ntpdc -c monlist

MrC
# 5  
Old 10-12-2008
MrC is so right! Just a few tweaks to get what you want. This monlist ALSO prints "peers", meaning Stratum 1 hosts. What I do is print the peers, and exclude those from the monlist. Observe:
Code:
 # get peers
 /usr/sbin/ntpdc -n -c listpeers |awk '{print $2}' >/tmp/peers.$$

 # get all hosts connected to this ntp server
 /usr/sbin/ntpdc -c monlist |awk '{ print $1 }' | 
    fgrep -v -f /tmp/peers.$$    # exclude those from the first list
 rm -f /tmp/peers.$$

Afterwards, you might want to do forward IP host resolution on the list. The reason I use the -n command is because the ntpdc output chops long hostnames off at a certain column, rendering the grep trick useless.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Red Hat

Ntp client sync with local over ntp server

Hi, I have two ntp servers in my cluster and I want all the nodes in my cluster to sync with either of the ntp servers or just one. Unfortunately it keep rotating the sync, between my ntp server 1, ntp server 2 and local. Is there anyway I can change the sync to avoid local? # ntpq -p ... (3 Replies)
Discussion started by: pjeedu2247
3 Replies

2. HP-UX

Setting up NTP HP-UX clients from solaris NTP server

Hi I wonder if its possible to setup NTP clients running HP-UX o.s. from a solaris 10 NTP server? FR (3 Replies)
Discussion started by: fretagi
3 Replies

3. Fedora

NTP Clients not sync

hi guys I have several Red Hat 5.7(7) all of them sync time with two NTP Servers based on Windows but the issue is I configure the NTP service, I start the ntp service and use ntpdate -u to set the time the first time This is what I do 1. Configure /etc/ntp.conf restrict default kod... (2 Replies)
Discussion started by: karlochacon
2 Replies

4. Red Hat

Tracking Process to a particular

I've tried to see what I can find on my own but I'm coming up with goose eggs. Basically I was wondering if there was a way of querying the scheduler (or something similar) to track a process back to a particular CPU it's executing on at the time of the command. ps has a "cpu" output option but... (1 Reply)
Discussion started by: thmnetwork
1 Replies

5. Linux

How often does Linux NTP server update its time with the external NTP server?

All here, thank you for listening. Now I've set up a Linux NTP server by adding a external windows NTP server in /etc/ntp.conf. Then I start the ntpd daemon. But how often does the Linux NTP server update its time with the external NTP server? I've looked up everywhere but found no information... (1 Reply)
Discussion started by: MichaelLi
1 Replies

6. UNIX for Advanced & Expert Users

Tracking down the problem

Is there a way to track down what process is sending to a certain port? I have some thing pounding the network with requests to a multicast IP that doesn't exist. I have shut down all comms related processes and yet it is still there. Need a way to track the port or IP back to the process. Thanks... (3 Replies)
Discussion started by: mattmanuel
3 Replies

7. AIX

NTP server with aix & wintel clients

Good morning to all, can someone advise me how to setup aix ntp server with aix & wintel clients? Secondly, I also require to enable the service to autostart on reboot, how do I configure this? Thirdly, how do I configure daily autosync between clients and server? Please advice, thanks.... (0 Replies)
Discussion started by: chongkls77
0 Replies

8. UNIX for Advanced & Expert Users

Tracking user

dear all, I'm facing problem that is i have noticed from few days back that some body is deleting and making changes in the file from developement server where i'm working(in unix) so i want to track that who is using the server, what performancr they are doing and each every thing which r... (5 Replies)
Discussion started by: panknil
5 Replies

9. UNIX for Advanced & Expert Users

Command Tracking

Hi, OS: Solaris9, SPARC Is there any way I can track the commands run by users from the shell prompt? Example: Somebody is deleting files from the system. Who it is is a mystery. That person obviously does not use bash prompt so there is no history. Is there anyway I can find out who... (5 Replies)
Discussion started by: mahatma
5 Replies

10. Solaris

ntp server and ntp client

All, How do you set a Solaris 9 server which received ntp updates from a ntp server to broadcast them on a local subnet. I have created a /etc/inet/ntp.conf file to receive the updates from a server on network and need to make this server become like a ntp relay from the main server. Any... (1 Reply)
Discussion started by: bubba112557
1 Replies
Login or Register to Ask a Question