RHEL/CentOS 6.x and RHEL/CentOS 7.x Networking
RHEL/CentOS 6/7 does not configure network interfaces on default installation. Also, it is configured to use NetworkManager. To enable networking interface and disable NetworkManager please follow instructions below.
The /etc/sysconfig/network-scripts/ifcfg-eth0 content looks as follows on default installation.
DEVICE="eth0" HWADDR=specifc mac address NM_CONTROLLED="yes" ONBOOT="no"
For DHCP, configure the interface as follows.
DEVICE="eth0" HWADDR=specifc mac address NM_CONTROLLED="no" ONBOOT="yes" BOOTPROTO="dhcp"
Restart the network after configuration. chkconfig NetworkManager off service NetworkManager stop /etc/init.d/network restart
For Static ip, configure it as follows
DEVICE="eth0" HWADDR=specifc mac address NM_CONTROLLED="no" ONBOOT="yes" BOOTPROTO="static" IPADDR=ip address here. NETMASK=netmask here.
Change the /etc/sysconfig/network to have the GATEWAY. NETWORKING=yes HOSTNAME=www1.nixcraft.in GATEWAY=gateway address here. Change /etc/resolve.conf nameserver Specify ip address of dns server/usually same as gateway.
For example configuration, see Method #3 http://www.cyberciti.biz/faq/rhel-centos-fedoracore-linux-network-card-configuration/
Restart the network after configuration. chkconfig NetworkManager off service NetworkManager stop /etc/init.d/network restart
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