Netgate SG-1000 microFirewall

Author Topic: How do I know my clients are using PFSense as NTP server?  (Read 171 times)

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Offline oscar.atkins

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How do I know my clients are using PFSense as NTP server?
« on: November 09, 2017, 06:49:28 pm »
Hi all,

As the title says, how do I know/find out whether my clients are using PFSense box (their gateway) as the NTP server?

I have configured NTP on the PFSense box but I need to somehow find out if my clients are using it.

For example, I have an Ubuntu client box, in which I see two options for date and time; Manual and From Internet. Since it has internet access, I assume it is getting date and time from the internet. I don't want that, I want them to use my PFSense as the time server and I don't know how to check.

Could anyone please help?

Thanks

Offline KOM

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Re: How do I know my clients are using PFSense as NTP server?
« Reply #1 on: November 09, 2017, 07:39:08 pm »
Unless you're serving the NTP server address as a DHCP option, your clients have no way of knowing to get their time from pfSense.  They either have to be explicitly told to use your time server, or you might be able to use a NAT rule to redirect their NTP traffic to pfSense.

Offline JKnott

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Re: How do I know my clients are using PFSense as NTP server?
« Reply #2 on: November 09, 2017, 09:17:34 pm »
Quote
As the title says, how do I know/find out whether my clients are using PFSense box (their gateway) as the NTP server?

Run packet filter to watch NTP traffic to see where it's going to/from.

Offline NogBadTheBad

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Re: How do I know my clients are using PFSense as NTP server?
« Reply #3 on: November 10, 2017, 01:03:34 pm »
Hi all,

As the title says, how do I know/find out whether my clients are using PFSense box (their gateway) as the NTP server?

I have configured NTP on the PFSense box but I need to somehow find out if my clients are using it.

For example, I have an Ubuntu client box, in which I see two options for date and time; Manual and From Internet. Since it has internet access, I assume it is getting date and time from the internet. I don't want that, I want them to use my PFSense as the time server and I don't know how to check.

Could anyone please help?

Thanks

Run sudo ntpq -p on the ubuntu server.

It may be using the ubuntu ntp servers.

https://help.ubuntu.com/lts/serverguide/NTP.html