IPv6 problem...
 

when i install freebsd 9/10:

1. ipv6 intermittent
2. when enabling pf, ipv6 reply was: destination unreachable from gateway

when i install centos 7:

1. ipv6 unreachable when ip6tables enable
2. ipv6 is ok when ip6tables disable

but why i cannot add ipv6 using /etc/sysconfig/network-scripts/ifcfg-eth0
when i insert:

IPV6INIT="yes"
IPV6ADDR="2a02:0128:0004:000d:MYIP:MYIP:MYIP:MYIP"
IPV6_DEFAULTGW="2a02:0128:0004:000d:0000:0000:0000 :0001"

and restart the network, even restart the vm, nothing happened, ipv6 not detected. i have to add manually using ip -6 addr add....