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====== RHEL / CentOS - How to setup the Network Manually ======

===== Without NetworkManager and using Traditional Configuration Files =====

Firstly, let's figure out what our adapter is

<code shell [enable_line_numbers="true"]>ls -la /sys/class/net</code>

This will give device names for the physical adapters

<code shell [enable_line_numbers="true"]>ip link</code>

should confirm it and provide a mac address. For this tutorial I'm going to assume its 00:0c:29:e1:b2:7c

We next need to disable Network Manager (if its enabled)

<code bash [enable_line_numbers="true"]>systemctl stop NetworkManager
systemctl disable NetworkManager</code>

Now we need to create the device config file in /etc/sysconfig/network-scripts using the physical device name above. I'm going to assume for this tutorial that it was called eno160. 

create a file /etc/sysconfig/network-scripts/ifcfg-ens160

<code [enable_line_numbers="true"]>NM_CONTROLLED="no"
HWADDR="00:0c:29:e1:b2:7c"
TYPE="Ethernet"
BOOTPROTO="none"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="no"
DEVICE="eno160"
ONBOOT="yes"</code>

Then we add our local IP stuff to the end e.g. 

<code [enable_line_numbers="true"]>DNS1="10.1.1.5"
IPADDR="10.1.1.2"
PREFIX="22"
GATEWAY="10.1.1.3"
ZONE=internal</code>

And that's it, now reboot and the interface should come right up.