Q: How to install DHCP Server for automatic IP addresses assignment?

1. Read General Notes
2. Read How to add extra repositories?

3. e.g. Assumed that "eth0" is the interface for network card
        IP Address Range: 192.168.0.100 to 192.168.0.200
        Subnet Mask: 255.255.255.0
        DNS Servers: 202.188.0.133, 202.188.1.5
        Domains: tm.net.my
        Gateway Address: 192.168.0.1

4. sudo apt-get install dhcp3-server
   sudo cp /etc/default/dhcp3-server /etc/default/dhcp3-server_backup
   sudo gedit /etc/default/dhcp3-server

5. Find this line

   ...
   INTERFACES=""

6. Replace with the following line

   INTERFACES="eth0"

7. Save the edited file (sample)

8. sudo cp /etc/dhcp3/dhcpd.conf /etc/dhcp3/dhcpd.conf_backup
   sudo gedit /etc/dhcp3/dhcpd.conf

9. Find this section

   ...
   # option definitions common to all supported networks...
   option domain-name "example.org";
   option domain-name-servers ns1.example.org, ns2.example.org;
   
   default-lease-time 600;
   max-lease-time 7200;
   ...

10. Replace with the following lines

    # option definitions common to all supported networks...
    #option domain-name "example.org";
    #option domain-name-servers ns1.example.org, ns2.example.org;
    
    #default-lease-time 600;
    #max-lease-time 7200;

11. Find this section

    ...
    # A slightly different configuration for an internal subnet.
    #subnet 10.5.5.0 netmask 255.255.255.224 {
    #  range 10.5.5.26 10.5.5.30;
    #  option domain-name-servers ns1.internal.example.org;
    #  option domain-name "internal.example.org";
    #  option routers 10.5.5.1;
    #  option broadcast-address 10.5.5.31;
    #  default-lease-time 600;
    #  max-lease-time 7200;
    #}
    ...

12. Replace with the following lines

    # A slightly different configuration for an internal subnet.
    subnet 192.168.0.0 netmask 255.255.255.0 {
      range 192.168.0.100 192.168.0.200;
      option domain-name-servers 202.188.0.133, 202.188.1.5;
      option domain-name "tm.net.my";
      option routers 192.168.0.1;
      option broadcast-address 192.168.0.255;
      default-lease-time 600;
      max-lease-time 7200;
    }

13. Save the edited file (sample)

14. sudo /etc/init.d/dhcp3-server restart

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