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Setup DHCP server on ubuntu 14.04


DHCP server is used to assign IP address to client computers and other Network devices . Basically we need Ipaddress, Subnet mask, Gateway and DNS for network settings . We need to define these values in the DHCP server, so that the client computer connected to that network gets values automatically from DHCP server.
This guide helps you to setup DHCP server on ubuntu 14.04.

Setup DHCP server on ubuntu 14.04

Before installation, Make sure you have assigned static IP to the server.
Step 1 » Issue the below command to update repository.
krizna@leela:~$ sudo apt-get update
Step 2 » Now install isc-dhcp-server package and dependencies.
krizna@leela:~$ sudo apt-get install isc-dhcp-server -y
Step 3 » After installing, open /etc/default/isc-dhcp-server file and assign interface.
krizna@leela:~$ sudo nano /etc/default/isc-dhcp-server
INTERFACES="eth0"

Step 4 » We need to define below values in dhcpd.conf file located in /etc/dhcp/ directory.
Example scenario:
Network : 192.168.100.0/24
Range : 192.168.100.20 ( Starting IP ) – 192.168.100.100 ( Ending IP )
Gateway : 192.168.100.1
Primary DNS : 192.168.100.5
Sec DNS : 8.8.8.8
Setup DHCP server on ubuntu 14.04
Take backup copy before making changes to the original file .Better rename the file and create a new one .
krizna@leela:~$ sudo mv /etc/dhcp/dhcpd.conf /etc/dhcp/dhcpd.conf.org
krizna@leela:~$ sudo nano /etc/dhcp/dhcpd.conf and add the below code after making changes as per your network values.

Step 5 » Now start/restart dhcp service using the below command.
krizna@leela:~$ sudo service isc-dhcp-server restart

Address Reservation

Sometimes you need to reserve IP to some devices like printers, camera, linux machines etc.
In this case, first you need to find MAC Address of that device and define values in that particular subnet.
For example, Printer with 00:DD:HD:66:55:9B MAC Address has to be assigned with 192.168.100.50 IP. For this, you need to add code like below to that subnet.

and restart DHCP service.
krizna@leela:~$ sudo service isc-dhcp-server restart
That’s it . All the best
Troubleshooting and more config options

  • Pingback: Ubuntu:How do I install and configure a DHCP server? – Ubuntu Linux Questions()

  • Meow

    thank you very much

  • Siddharth Mehta

    How many users can supported by Linux based DHCP server?I want confiure it for 400-500 users. Will it work for me? And Can I use two gateway to access internet?

    • adnna

      ok

  • Braselectron Innovation

    Dear Krizna,

    Namaste!

    One more question (or maybe answer), to disable the dhcp server is it sufficient to edit the /etc/default/isc-dhcp-server
    and edit the line INTERFACES= (# remove the “eth0”)
    and issue a command:
    sudo service isc-dhcp-server stop

    Or do I need to take additional action to avoid autostart at reboot ?