Package

apt install -y isc-dhcp-server

PUB-R

vi /etc/dhcp/dhcpd.conf

### vi ###
subnet 1.1.1.0 netmask 255.255.255.0 {
	range 1.1.1.101 1.1.1.200;
	option routers 1.1.1.254;
	option domain-name-servers 1.1.1.1;
}
### vi ###

vi /etc/default/isc-dhcp-server

### vi ###
INTERFACESv4="ens39"
### vi ###

systemctl restart isc-dhcp-server
systemctl status isc-dhcp-server

MAIN-R

vi /etc/dhcp/dhcpd.conf

### vi ###
subnet 10.0.0.0 netmask 255.255.255.0 {
	range 10.0.0.101 10.0.0.200;
	option routers 1.1.1.254;
	option domain-name-servers 1.1.1.1;
}
### vi ###

vi /etc/default/isc-dhcp-server

### vi ###
INTERFACESv4="ens38""
### vi ###

systemctl restart networking
systemctl status networking