Changing Linux Network Configuration

To make changes to a Linux servers IP configuration, follow the steps below. Use :x to exit the files you are changing to save them: 

Step 1 - Run ifconfig and note the name of the active network interface on the left. As standard this should always be eth0 but for some configurations it may be different

Step 2 - Run vim /etc/sysconfig/network-scripts/ifcfg-InterfaceName

Step 3 - In this file, make your changes to the IPADDR, NETMASK and GATEWAY fields. If there is no gateway field move onto the next step otherwise skip to step 5

Step 4 - Run vim /etc/sysconfig/network and change the gateway

Step 5 - Run service network restart to restart the network interface and pick up the changes. Any connections to the server will be lost when you do this.