In this article, we will explore the concept of IP addressing and its importance in the Linux environment. We will discuss how IP addresses are used to identify devices on a network, allocate IP addresses in Linux, and configure network interfaces. Additionally, we will provide practical examples and commands specific to the Linux environment.

Examples:

1. Allocating IP Addresses in Linux:

   • To allocate a static IP address to a network interface, open the terminal and navigate to the network configuration directory: cd /etc/sysconfig/network-scripts/
   • Identify the network interface you want to configure, such as eth0 or ens33, and open the corresponding configuration file using a text editor: vim ifcfg-eth0
   • Within the file, modify the BOOTPROTO value to static and add the desired IP address, subnet mask, default gateway, and DNS servers:

     BOOTPROTO=static
     IPADDR=192.168.1.100
     NETMASK=255.255.255.0
     GATEWAY=192.168.1.1
     DNS1=8.8.8.8
     DNS2=8.8.4.4

   • Save the changes and restart the network service: systemctl restart network

2. Configuring DHCP in Linux:

   • To configure a network interface to obtain an IP address automatically from a DHCP server, open the terminal and navigate to the network configuration directory: cd /etc/sysconfig/network-scripts/
   • Open the configuration file for the desired interface: vim ifcfg-eth0
   • Change the BOOTPROTO value to dhcp:

     BOOTPROTO=dhcp

   • Save the changes and restart the network service: systemctl restart network