Ubuntu / Debian Linux: Setup An ISC DHCP Server For Your Network

To set up an ISC DHCP server on Ubuntu or Debian Linux, follow these steps:

1. Install the ISC DHCP server package by running the following command:

sudo apt-get install isc-dhcp-server

2. Edit the DHCP configuration file. The file is located at /etc/dhcp/dhcpd.conf. Open the file in a text editor by typing the following command:

sudo nano /etc/dhcp/dhcpd.conf

3. In the configuration file, specify the network range and the subnet mask for your network. For example:

subnet 192.168.1.0 netmask 255.255.255.0 {
  range 192.168.1.100 192.168.1.200;
}

This defines a network range of 192.168.1.100 to 192.168.1.200 with a subnet mask of 255.255.255.0.

4. Specify the router's IP address and the DNS server's IP address. For example:

option routers 192.168.1.1;
option domain-name-servers 192.168.1.1;

This sets the router's IP address to 192.168.1.1 and the DNS server's IP address to 192.168.1.1.

5. Save the changes and exit the text editor.

6. Edit the DHCP server's default interface configuration file. The file is located at /etc/default/isc-dhcp-server. Open the file in a text editor by typing the following command:

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

7. Find the INTERFACES directive in the file and specify the name of the network interface that you want to use for the DHCP server. For example:

INTERFACES="eth0"

This sets the DHCP server to use the eth0 interface.

8. Save the changes and exit the text editor.

9. Restart the DHCP server by typing the following command:

sudo service isc-dhcp-server restart

The DHCP server is now set up and ready to serve DHCP requests on the specified network interface.

Note: This is just a basic configuration example. There are many other options and settings that you can specify in the DHCP configuration file to customize the behavior of the DHCP server. You should consult the ISC DHCP documentation for more information.