I'm trying to set a DHCP server on 12.04. I installed:

sudo apt-get install isc-dhcp-server

My configuration files look like this:

/etc/default/isc-dhcp-server

INTERFACES="eth0"

/etc/network/interfaces

auto lo
iface lo inet loopback

/etc/dhcp/dhcpd.conf

ddns-update-style none;
default-lease-time 600;
max-lease-time 7200;
authoritative;
log-facility local7;

subnet 192.168.1.0 netmask 255.255.255.0
{
    range                       192.168.1.235 192.168.1.240;
    option subnet-mask          255.255.255.0;
    option broadcast-address    192.168.1.255;
    option routers              192.168.1.1;
    default-lease-time          100000;
    max-lease-time              100000;
}

When I run sudo service isc-dhcp-server restart I get:

stop: Unknown instance: 
isc-dhcp-server start/running, process 15384

After this if I run sudo service isc-dhcp-server status it shows that its stopped:

isc-dhcp-server stop/waiting

What am I doing wrong here?