Follow the steps mentioned below to configure or assign static IP to a centos machine:

1. Check for interface name of the ip to be made static by running command:

ifconfig

2. If the interface name of IP is say eth6 then create or open the corresponding interface file as:

sudo nano /etc/sysconfig/network-scripts/ifcfg-eth6

3. Add following values to this interface file:

DEVICE="eth6"
NM_CONTROLLED="yes"
ONBOOT=yes
TYPE=Ethernet
BOOTPROTO=static
NAME="System eth6"
IPADDR=192.168.56.102
NETMASK=255.255.255.0

4. Open the network file:

sudo nano /etc/sysconfig/network

5. Add following at the end of file:

GATEWAY=192.168.56.1

6. Restart network using:

sudo /etc/init.d/network restart
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