faniiritamaria: How to install the DHCP Server on Ubuntu 12.04LTS

Ubuntu as DHCP Server:

To install dhcp server, enter the following command at a terminal prompt:

sudo apt-get install isc-dhcp-server

If there is more than one network card(s) in your Ubuntu server, then you have to select the network card on which your server will be listen for dhcp request. (By default, it listens on eth0).

You can change this by editing /etc/default/isc-dhcp-server file:

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

Change “eth0” to the interface on which you want that your server will listen for dhcp request (In my case, it iseth1):

It’s always a good practice to make a backup copy of /etc/dhcp/dhcpd.conf file:

sudo cp /etc/dhcp/dhcpd.conf /etc/dhcp/dhcpd.conf.bak

Now we will change the default configuration by editing /etc/dhcp/dhcpd.conf, I normally delete everything inside the file and manually add the configuration that suits my needs :-)

sudo nano /etc/dhcp/dhcpd.conf

Here is my dhcpd.conf file, you need to change it according to your needs:

ddns-update-style none;
default-lease-time 600;
max-lease-time 7200;
authoritative;
log-facility local7;
option subnet-mask 255.255.255.0;
option broadcast-address 10.10.1.255;
option routers 10.10.1.1;
option domain-name-servers 10.10.1.1;
option domain-name "ubuntu.internal";
subnet 10.10.1.0 netmask 255.255.255.0 {
range 10.10.1.50 10.10.1.200;
}