Update
apt-get update
Install
apt-get install dnsmasq
Edit
nano /etc/dnsmasq.conf
Uncomment additional config file
conf-file=/etc/dnsmasq.more.conf
Create additional config file
nano /etc/dnsmasq.more.conf
Add configs
domain-needed
local=/koti/
address=/koti/[internal ip]
Restart DNSmasq
systemctl restart dnsmasq
Check status of DNSmasq
systemctl status dnsmasq
Test
nslookup tamakin.koti [internal IP]