Docker Container to Container communication with IPv6 only - docker

Question

I am running two VM on OpenStack Mirantis. For Simplicity let's call host-1 and host-2. I am unable to communicate neither from Container to Container on different hosts not Container to Public Internet On each Host I have installed Docker ver 1.12.3 and run the following things --
tee Dockerfile <<-'EOF'
FROM centos
RUN yum -y install net-tools bind-utils iputils*
EOF
Later --
docker build -t crazy:3 .
On host-1 :--
dockerd --ipv6 --fixed-cidr-v6="2001:1b76:2400:e2::2/64" &
run -i -t --entrypoint /bin/bash crazy:3
ping6 -c3 google.com
ifconfig
On host-2 :--
dockerd --ipv6 --fixed-cidr-v6="2001:1b76:2400:e2::2/64" &
run -i -t --entrypoint /bin/bash crazy:3
ping6 -c3 google.com
ifconfig
Host-1 output:--
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.2 netmask 255.255.0.0 broadcast 0.0.0.0
inet6 2001:1b76:2400:e2:0:242:ac11:2 prefixlen 64 scopeid 0x0<global>
inet6 fe80::42:acff:fe11:2 prefixlen 64 scopeid 0x20<link>
ether 02:42:ac:11:00:02 txqueuelen 0 (Ethernet)
RX packets 18 bytes 1663 (1.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 53 bytes 4604 (4.4 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
Host-2 output:--
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.17.0.2 netmask 255.255.0.0 broadcast 0.0.0.0
inet6 2001:1b76:2400:e2:0:242:ac11:3 prefixlen 64 scopeid 0x0<global>
inet6 fe80::42:acff:fe11:2 prefixlen 64 scopeid 0x20<link>
ether 02:42:ac:11:00:02 txqueuelen 0 (Ethernet)
RX packets 8 bytes 808 (808.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 6 bytes 508 (508.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
Then again
On host-1:--
ping6 2001:1b76:2400:e2:0:242:ac11:3
On host-2:--
ping6 2001:1b76:2400:e2:0:242:ac11:2
All are same output i,e --
PING 2001:1b76:2400:e2:0:242:ac11:3(2001:1b76:2400:e2:0:242:ac11:3) 56 data bytes
From 2001:1b76:2400:e2:0:242:ac11:2 icmp_seq=1 Destination unreachable: Address unreachable
From 2001:1b76:2400:e2:0:242:ac11:2 icmp_seq=2 Destination unreachable: Address unreachable
From 2001:1b76:2400:e2:0:242:ac11:2 icmp_seq=3 Destination unreachable: Address unreachable
From 2001:1b76:2400:e2:0:242:ac11:2 icmp_seq=4 Destination unreachable: Address unreachable
Both hosts ip route are same i,e --
2001:1b76:2400:e2:f816:3eff:fe69:c2f2 dev eth0 metric 0
cache
2001:1b76:2400:e2::/64 dev eth0 proto kernel metric 256 expires 28133sec
2001:1b76:2400:e2::/64 dev docker0 proto kernel metric 256
2001:1b76:2400:e2::/64 dev docker0 metric 1024
fe80::/64 dev eth0 proto kernel metric 256
fe80::/64 dev docker0 proto kernel metric 256
Both containers ip route are same i,e --
2001:1b76:2400:e2::1 dev eth0 metric 0
cache
2001:1b76:2400:e2::/64 dev eth0 proto kernel metric 256
fe80::/64 dev eth0 proto kernel metric 256
default via 2001:1b76:2400:e2::1 dev eth0 metric 1024
Both hosts ip forwarding are same i,e --
net.ipv4.conf.all.forwarding = 1
net.ipv6.conf.all.forwarding = 1
Both containers ip forwarding are same i,e --
net.ipv4.conf.all.forwarding = 1
net.ipv6.conf.all.forwarding = 0