Principe

DHCP = Dynamic Host Configuration Protocol
UDP 67 = serveur
UDP 68 = client

DORA

Discover
Offer
Request
ACK

Serveur DHCP Debian

sudo apt install isc-dhcp-server
sudo nano /etc/default/isc-dhcp-server
INTERFACESv4="ens18"

dhcpd.conf

subnet 192.168.10.0 netmask 255.255.255.0 {
 range 192.168.10.100 192.168.10.200;
 option routers 192.168.10.1;
 option domain-name-servers 192.168.10.10, 1.1.1.1;
 option domain-name "lab.local";
}

Service

sudo systemctl restart isc-dhcp-server
sudo systemctl status isc-dhcp-server
journalctl -u isc-dhcp-server -xe