How to set IPv6 address on CentOS or UNIX system.

User: root
Password: ****


Go to ==>
 cd /etc/sysconfig/network-scripts
ls                                                                                                             // List of interface

Add following lines inside ifcfg-eth0/ifcfg-eth1:
NETWORKING_IPV6=yes
IPV6INIT=yes
IPV6ADDR=<IPv6-IP-Address>
IPV6_DEFAULTGW=<IPv6-IP-Gateway-Address>

#### Example #####

# vi ifcfg-eth1

DEVICE=eth1
BOOTPROTO=static
ONBOOT=yes
NM_CONTROLLED=no
HWADDR=00:42:81:5e:a8:34
NETWORKING_IPV6=yes
IPADDR=207.234.118.4
GATEWAY=207.234.118.1
NETMASK=255.255.255.248
IPV6INIT=yes
IPV6ADDR=2001:470:18:473::ca7e:7b8c
IPV6_DEFAULTGW=2001:470:18:473::4



#### Interface restart ####
ifdown eth1
ifup eth1
or
service network restart


#### Check Interface ####
ifconfig                                                      //It will show the interface details.



##### Check Kernel IPv6 routing table: ######
route -n -A inet6


###### Test: #######
ping6 ipv6.google.com
traceroute6 ipv6.google.com
mtr ipv6.google.com



====================== Enjoy ==============

How to configure Asus RT-N66U as a IPv6 wireless based router.

Back side of the router:

Factory default settings:

IP: 192.168.1.1

User ID: Admin

Password: Admin.

==>  Set LAN (Local IP/Private IP):

 

===>  Enable DHCP Server:

===> Setup WAN (Public/Real IP):

 

===> Setup Wireless Connection:

===> IPv6 Tunnel Setup (DDNS):

IPv6 Tunnel Setup (IPv6)

Firewall Setup: 

System Setup (Optional) for 2.4 GHz:

System Setup (Optional) for 5 GHz: 

Reboot Setup Complete:

===Enjoy Its Done ====