How can I bind whole IPv6 /64 block to a CentOS 7 server?

I know there are multiple questions about this but none of them fixed my problem. Please don't close my question.

I had created a bash script for itself adding it one by one with ifconfig. I was using those for creating proxies with 3proxy. But after a while it was getting disconnected and slower. I discovered ndppd. It was working on eth0. I have changed a server and it is not working on ens192. I'm out of ideas. What can I do?

My main IP:

2a0f:XXXX:XXX:X::9a

My ifconfig file:

ens192: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet MYIPV4  netmask 255.255.255.0  broadcast XXX.XXX.XX.XXX
        inet6 2a0f:XXXX:XXX:X::XX  prefixlen 64  scopeid 0x0<global>
        inet6 XXXX::XXXX:XXXX:XXXX:XXXX  prefixlen 64  scopeid 0x20<link>
        inet6 XXXX::XXXX:XXXX:XXX:XXXX  prefixlen 64  scopeid 0x20<link>
        inet6 XXXX::XXXX:XXXX:XXX:XXXX  prefixlen 64  scopeid 0x20<link>
        ether 00:50:56:00:19:84  txqueuelen 1000  (Ethernet)
        RX packets 2362  bytes 226724 (221.4 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1015  bytes 126883 (123.9 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 4  bytes 340 (340.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 4  bytes 340 (340.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

The commands that I tried;

sysctl net.ipv6.ip_nonlocal_bind=1
ip route add local 2a0f:XXXX:XXX:X::/64 dev lo
ip add add local 2a0f:XXXX:XXX:X::/64 dev lo
ip route add local 2a0f:XXXX:XXX:X::/64 dev ens192

My ndppd config file:

route-ttl 30000
proxy ens192 {
router no
timeout 500
ttl 30000
rule 2a0f:XXXX:XXX:X::/64 {
static
}
}