apt install isc-dhcp-server
systemctl restart isc-dhcp-server
nano -c /etc/default/isc-dhcp-server
# INTERFACESv4="enp0s3 enp0s8"
journalctl -f -n 100
cat /var/lib/dhcp/dhcpd.leases

nano -c /etc/dhcp/dhcp.conf
subnet 10.10.19.0 netmask 255.255.255.0 {
    option routers 10.10.19.1;
    option subnet-mask 255.255.255.0;
    option domain-name-servers 8.8.8.8;
    range 10.10.n.50 10.10.n.150;
    range 10.10.n.200 10.10.n.254;
    default-lease-time 21600;
    max-lease-time 43200;
}
 host clienteDHCP2{
        hardware ethernet AA:BB:CC:DD:EE:FF;
        fixed-address 10.10.19.44;
 }
systemctl restart isc-dhcp-server

#en ambos
ufw allow 68
ufw allow 67

#servidor 2
dhclient -v -r
dhclient -v 

ip a
route -n 
cat /etc/resolv.conf
journalctl -f 
tail -f /var/lib/dhcp/dhcpd.leases

###router normalmente
nano /etc/default/isc-dhcp-relay
SERVERS="IP del servidor DHCP" 
INTERFACES="interfaces por lo que se atienden peticiones de clientes"