/etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
#iface eth0 inet dhcp
	address 192.168.0.1
	netmask 255.255.255.0
	network 192.168.0.0
	broadcast 192.168.0.255
	dns-nameservers 192.168.25.1

/etc/dhcp/dhcpd.conf 

authoritative;

# A slightly different configuration for an internal subnet.
subnet 192.168.0.0 netmask 255.255.255.0 {
range 192.168.0.2 192.168.0.199;
option domain-name "mofuce.local";
option domain-name-servers 192.168.25.1,4.2.2.1,4.2.2.2;
option routers 192.168.0.1;							option broadcast-address 192.168.0.255;				
default-lease-time 86400;
max-lease-time 86400;								
}

sudo pluma /etc/default/isc-dhcp-server 

# Defaults for isc-dhcp-server initscript
# sourced by /etc/init.d/isc-dhcp-server
# installed at /etc/default/isc-dhcp-server by the maintainer scripts

#
# This is a POSIX shell fragment
#

# Path to dhcpd's config file (default: /etc/dhcp/dhcpd.conf).
#DHCPD_CONF=/etc/dhcp/dhcpd.conf

# Path to dhcpd's PID file (default: /var/run/dhcpd.pid).
#DHCPD_PID=/var/run/dhcpd.pid

# Additional options to start dhcpd with.
#	Don't use options -cf or -pf here; use DHCPD_CONF/ DHCPD_PID instead
#OPTIONS=""

# On what interfaces should the DHCP server (dhcpd) serve DHCP requests?
#	Separate multiple interfaces with spaces, e.g. "eth0 eth1".
INTERFACES="eth0"