Ubuntu Linux Configure Gateway / Default Routing IP Address

To configure the default routing or gateway IP address on an Ubuntu Linux system, you can follow these steps:

1. Determine the name of the network interface that you want to configure. You can use the ifconfig command to list the available interfaces and their current IP addresses.

2. Open the network configuration file for the interface that you want to configure in a text editor (e.g. nano):

sudo nano /etc/network/interfaces

3. Edit the configuration for the interface to specify the gateway IP address. For example, to set the gateway IP address to 192.168.1.1, you can add the following line to the configuration file:

gateway 192.168.1.1

4. Save the configuration file and close the text editor.

5. Restart the networking service to apply the changes:

sudo service networking restart

The gateway IP address should now be configured on the interface. You can verify the configuration by running the route -n command, which should display the default gateway in the output.

Keep in mind that the above steps assume that you are using the /etc/network/interfaces file to configure the network interfaces. If you are using a different method to configure the network, the steps may be different.

You can also use the ip command to configure the default gateway on an Ubuntu system. For example, to set the default gateway to 192.168.1.1 on the eth0 interface, you can use the following command:

sudo ip route add default via 192.168.1.1 dev eth0

This will set the default gateway to 192.168.1.1 on the eth0 interface. The changes will be applied immediately.

For more information on configuring the default gateway on Ubuntu Linux, you can refer to the Ubuntu documentation or the documentation for the ip command.