How to setup a NTP server on Ubuntu

Official Ubuntu Website
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0:00 - Intro
0:10 - Explain all the Ubuntu server services currently installed (Domain Controller, Active Directory, DNS, DHCP)

2:05 - Installing NTP server service Chrony
sudo apt install chrony

3:10 - Configure the Chrony NTP file
sudo nano /etc/chrony/chrony.conf

Restart service with:
sudo systemctl restart chrony.service

4:15 - Add the following to the chrony.conf file (allow 10.0.0.0/20 or the subnet of your network)

sudo nano /etc/chrony/chrony.conf
allow 10.0.0.0/20
ctrl+x and then Y and enter to save file
sudo systemctl restart chrony.service

5:35 - update firewall rules inside Ubuntu
sudo ufw allow 123

6:03 - Update NTP inside of Windows

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