Tryed everything, cannot make it work.. Please help

[Eugene Minov]

• OS: Debian 9.6
• IPv6 range 2a01:4f8:192:6406::/64 pinging successfully from outside
• ping6 google.com is working fine from host

Steps I made:

nano /etc/docker/daemon.json

{
    "experimental": true,
    "ipv6": true,
    "fixed-cidr-v6": "2a01:4f8:192:6406::/64"
}

service docker restart

sysctl -w net.ipv6.conf.enp0s31f6.accept_ra=2
sysctl -w net.ipv6.conf.all.forwarding=1
sysctl -w net.ipv6.conf.default.forwarding=1

docker run -d --privileged --name ipv6nat --cap-add NET_ADMIN --cap-add NET_RAW --cap-add SYS_MODULE --cap-drop ALL --network host --restart unless-stopped -v /var/run/docker.sock:/var/run/docker.sock:ro -v /lib/modules:/lib/modules:ro robbertkl/ipv6nat --retry --debug

ip6tables -L

Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         
DOCKER-USER  all      anywhere             anywhere            
DOCKER-ISOLATION-STAGE-1  all      anywhere             anywhere            

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination         

Chain DOCKER (0 references)
target     prot opt source               destination         

Chain DOCKER-ISOLATION-STAGE-1 (1 references)
target     prot opt source               destination         
RETURN     all      anywhere             anywhere            

Chain DOCKER-ISOLATION-STAGE-2 (0 references)
target     prot opt source               destination         
RETURN     all      anywhere             anywhere            

Chain DOCKER-USER (1 references)
target     prot opt source               destination         
RETURN     all      anywhere             anywhere

docker run --rm -it debian:9 ping6 google.com -c3

PING google.com(fra24s07-in-x0e.1e100.net (2a00:1450:4001:82a::200e)) 56 data bytes

--- google.com ping statistics ---
3 packets transmitted, 0 received, 100% packet loss, time 2032ms

Fought with this for a halve a day with no success.
Please help