Server Configuration: (dhcp6s)

First we will install DHCPv6 RPM on the server:

# yum -y install dhcpv6
After installing the above mentioned RPM we will turn on global IPv6 initialization and will also enable forwarding of IPv6 packets:
# vi /etc/sysconfig/network


Then we will turn on IPv6 on a particular device and we will also a set an IPv6 address for that device by adding the following lines:
# vi /etc/sysconfig/network-scripts/ifcfg-eth0


Now we will specify the interface for DHCPv6 server:
# vi /etc/sysconfig/dhcp6s


Next, we will edit the main DHCPv6 server configuration file as following:
# cp /usr/share/doc/dhcpv6-*/dhcp6s.conf /etc/
# vi /etc/dhcp6s.conf
interface eth0 {
server-preference 255;
renew-time 60;
rebind-time 90;
prefer-life-time 130;
valid-life-time 200;
allow rapid-commit;
option dns_servers 2002:1851:c622:1::1 example.com;
link AAA {
range 2002:1851:c622:1::2 to 2002:1851:c622:1::9/64;
prefix 2002:1851:c622:1::/64;
Finally, we will start DHCPv6 server daemon:
# service network restart && service dhcp6s start && chkconfig dhcp6s on

Client Configuration: (dhcp6c)

We will start client configuration by installing DHCPv6 client RPM:

# yum –y install dhcpv6_client
Then we will enable IPv6 networking on the client:
# vi /etc/sysconfig/network


Next we will configure a particular device to participate as DHCPv6 client by adding the following lines to that device configuration file:
# vi /etc/sysconfig/network-scripts/ifcfg-eth0


After that we will edit the main DHCPv6 client configuration file as following:
# cp /usr/share/doc/dhcpv6_client-*/dhcp6c.conf /etc/
# vi /etc/dhcp6c.conf
interface eth0 { 
send rapid-commit;
request domain-name-servers;
Finally we will restart networking on the client to acquire an IPv6 address from the DHCPv6 server:
# service network restart
That’s all. If everything goes right we will see a global IPv6 address on the client by running:
# ifconfig eth0

Source: http://blog.zakir.net/index.php?/archives/3-Configuring-DHCPv6-on-Linux.html