If you need to change centos 6 ip or gateway and also dns configurations you can use this post .

 

IP and Gateway configuration

With this 2 commands you can see centos network configurations

 

     nano /etc/sysconfig/network-scripts/ifcfg-eth0

     vi /etc/sysconfig/network-scripts/ifcfg-eth0

 

the result of this commands should be sommthing like this

 

DEVICE=eth0
TYPE=Ethernet
UUID=281a600c-aaba-4297-bf51-15b18d2d8619
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
IPADDR=23.227.x.x
PREFIX=26
GATEWAY=23.227.x.x
DNS1=4.2.2.4
DOMAIN=8.8.8.8
DEFROUTE=yes
IPV4_FAILURE_FATAL=yes
IPV6INIT=no
NAME="System eth0"
HWADDR=00:50:56:B0:4D:D6
LAST_CONNECT=1410687738

 

2 important element that you should change are IPADDR &  GATEWAY

to change the ip address change the value of IPADDR and to change gateway change the value of GATEWAY

 

 

Gateway Configuration

With this 2 commands you can see centos Gateway configurations

 

        nano /etc/sysconfig/network

        vi /etc/sysconfig/network

the result of this commands should be sommthing like this

 

NETWORKING=yes
HOSTNAME=server.domain.com
GATEWAY=23.227.x.x

you can change the Gateway by editing the value of GATEWAY

 

 

Configure DNS Server

With this 2 commands you can see centos Gateway configurations


         nano /etc/resolv.conf

         vi /etc/resolv.conf

the result of this commands should be sommthing like this

nameserver 8.8.8.8
nameserver 192.168.1.1

you can change the values for dns servers

 

For learning Nano editor click link below

http://monovm.com/post/35/Nano-Editor-Learn

 Centos 6 Network Configuration

Regards

MonoVM.com