This issue is solved of IPv6 sub-interfaces with adding multi IP addresses on the eth0 interfaces network script to be like the below:
#Intel Corporation 82576 Gigabit Network Connection
DEVICE=eth0
BOOTPROTO=none
HWADDR=00:26:55:80:d0:ec
ONBOOT=yes
TYPE=Ethernet
NETMASK=255.255.255.240
IPADDR=8*.*35.*.**
GATEWAY=8*.*35.*.**
IPV6INIT=yes
IPV6ADDR=2001:16a0:*:*::11
IPV6_DEFAULTGW=2001:16a0:3:1::1
IPV6ADDR_SECONDARIES=”2001:16a0:*:*::12 \
2001:16a0:*:*::13 \
2001:16a0:*:*::14 \
2001:16a0:*:*::15 \
2001:16a0:*:*::16 \
2001:16a0:*:*::17 \
2001:16a0:*:*::18 \
2001:16a0:*:*::19 \
2001:16a0:*:*::20 \
2001:16a0:*:*::21″
http://www.centos.org/modules/newbb/viewtopic.php?topic_id=37125&forum=58