CentOS / Red Hat IPv6 Network Configuration

Setting up IPv6 on CentOS, and for that matter RHEL and Fedora Linux, is quite straight forward. You need to edit just two files:

1. /etc/sysconfig/network-scripts/ifcfg-
2. /etc/sysconfig/network

1. Configure the IP address. For example, for interface eth0, edit /etc/sysconfig/network-scripts/ifcfg-eth0 and make the necessary changes as below.DEVICE=eth0
HWADDR=00:22:15:17:CC:C1
BOOTPROTO=static
IPADDR=192.168.1.2
NETMASK=255.255.255.0
NETWORK=192.168.1.0
BROADCAST=192.168.1.255
IPV6INIT=yes
IPV6_AUTOCONF=no
IPV6ADDR=<ipv6 address>
ONBOOT=yes
2. Configure the gateway (nano /etc/sysconfig/network).
   NETWORKING=yes
HOSTNAME=yourdomain.com
GATEWAY=192.168.1.254
NETWORKING_IPV6=yes
IPV6_DEFAULTGW=<ipv6 gateway>
IPV6_DEFAULTDEV=eth0

   The ones in bold are related to IPv6 address configuration. The rest of the configuration are either specific to IPv4 address or common to both v4 and v6 address.

3. Finally, restart your network.
   service network restart