Setting up DHCP Server

DHCP Server is one of services running on my Raspberry PI. Here is a short guide how to setup such service.

First you need to install dhcp package (may vary depending on your distribution). Next you need to edit main configuration file /etc/dhcpd.conf where you can set all necessary information.
Here is my example configuration:

default-lease-time 1800;
max-lease-time 7200;

log-facility local7;

subnet 172.16.0.0 netmask 255.255.255.0 {
    range 172.16.0.101 172.16.0.254;
    option domain-name-servers 192.168.0.1, 88.212.8.8, 88.212.8.88;
    #filename "pxelinux.0";        # the PXELinux boot agent
    option subnet-mask 255.255.255.0;
    option broadcast-address 172.16.0.255;
    option routers 172.16.0.1;
}

host LenovoZ560 {
  hardware ethernet aa:aa:aa:aa:aa:aa;
  fixed-address 172.16.0.2;
#  option domain-name-servers 8.8.8.8;
  option subnet-mask 255.255.255.0;
  option broadcast-address 172.16.0.255;
  option routers 172.16.0.1;
}

Short description:
- subnet section defines IP range from which addresses will be assigned
- there are also DNS servers, which you need to adjust to your DNS addresses

- the host section is optional, in general it serves to specify hosts (identified by hardware ethernet address) which will obtain always the same IP address (fixed-address).

Next step is to enable dhcpd startup during boot:
systemctl enable dhcpd4

NOTE: this defaults to eth0 interface, if you want your dhcpd service to assign addresses on other interface, copy /usr/lib/systemd/system/dhcpd4.service to /etc/systemd/system/multi-user.target.wants/ edit this file and change eth0 to your desired network interface.
NOTE: do not edit files in /usr/lib/systemd/system/ because they might be overwritten during systemd update.