How Do I Add an IP Address to a Network Interface in Linux?

You can add an IP address to a network interface in Linux using the ifconfig command.

Here's how:

Identify the network interface: Use the ifconfig command without any arguments to list all available network interfaces. The output will show the name of each interface, such as eth0, wlan0, or enp0s3.
Add the IP address: Use the following command, replacing <interface_name> with the name of your network interface and <IP_address> with the desired IP address:
```
sudo ifconfig <interface_name> <IP_address> netmask <netmask>
```
- <netmask> is the subnet mask, which determines the network portion of the IP address. For example, a common subnet mask is 255.255.255.0.
Optional: Set the broadcast address: You can also set the broadcast address using the bcast option:
```
sudo ifconfig <interface_name> <IP_address> netmask <netmask> broadcast <broadcast_address>
```
- <broadcast_address> is the address used for broadcasting messages to all devices on the network.
Verify the configuration: After adding the IP address, use the ifconfig command again to verify that the new configuration is applied correctly.

Example:

To add the IP address 192.168.1.100 with a subnet mask of 255.255.255.0 to the network interface eth0:

sudo ifconfig eth0 192.168.1.100 netmask 255.255.255.0

Note:

You may need root privileges (sudo) to run the ifconfig command.
The ifconfig command is a legacy tool. For more modern and robust network configuration, consider using the ip command or network management tools like NetworkManager.

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