# Add NTP server, cache + intercept

**URL:** https://discourse.pi-hole.net/t/add-ntp-server-cache-intercept/36046
**Category:** Closed or Out Of Scope
**Created:** [July 21, 2020, 10:38pm UTC](https://discourse.pi-hole.net/t/add-ntp-server-cache-intercept/36046 "2020-07-21T22:38:55Z")
**Posts on this page:** 1
**Showing post:** 3

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### Author: ![deHakkelaar](https://discourse-cdn.pi-hole.net/user_avatar/discourse.pi-hole.net/dehakkelaar/32/674_2.png) [@deHakkelaar](https://discourse.pi-hole.net/u/deHakkelaar)
#### Post date: [July 21, 2020, 10:58pm UTC](https://discourse.pi-hole.net/t/add-ntp-server-cache-intercept/36046/3 "2020-07-21T22:58:57Z")

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I dont know who is doing DHCP for your network but I recon if the DHCP service doesnt push an NTP server to its clients, the Windows boxes default to using `time.windows.com` for time.  
You could even push an IP instead of name for NTP so it doesnt need to resolve through Pi-hole.

> [@Specify DHCP option for ntp-server in Pihole FTL](https://discourse.pi-hole.net/t/specify-dhcp-option-for-ntp-server-in-pihole-ftl/21720/4):
>
> I dont think your doing anything wrong: pi@noads:~ $ echo 'dhcp-option=42,11.22.33.44' | sudo tee /etc/dnsmasq.d/42-pihole-dhcp-ntp.conf dhcp-option=42,11.22.33.44 pi@noads:~ $ sudo service pihole-FTL reload pi@noads:~ $ dehakkelaar@laptop:~$ sudo nmap -sU -p67 --script dhcp-discover 10.0.0.2 Starting Nmap 7.40 ( https://nmap.org ) at 2019-07-17 17:55 CEST Nmap scan report for noads.dehakkelaar.nl (10.0.0.2) Host is up (0.0013s latency). PORT STATE SERVICE 67/udp open dhcps | dhcp-disco…

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