These are the steps that I followed, in order to make a DHCP server in Debian 9 Stretch.

First of all we need to assign an IP address on our main ethernet interface. For this guide, I will use interface enp0s2. So we have to edit the file /etc/network/interfaces and add the following :

auto enp2s0
 allow-hotplug enp2s0
 iface enp2s0 inet static
         address 192.168.1.1/24
         dns-nameservers 8.8.8.8
         dns-search mydomain.com

Then we need to download our dhcp package.

sudo apt install isc-dhcp-server

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