How configure docker with ipv6?


I was following the steps of the official docker documentation ( about to enable ipv6 in docker and the containers have ip6 but when I execute ping6, all packages are lost. The container does not have a connection using ip6 with the external hosts.

I’ve configured the next in the daemon.json:

"ipv6": true,
"fixed-cidr-v6": "xxxx:xxxx:xxxx/124"

I use /124 because DigitalOcean only give 14 ipv6 addresses. Also, I execute the following commands too:

net.ipv6.conf.default.forwarding = 1

The container has a ip6:

18: eth0@if19: <BROADCAST,MULTICAST,UP,LOWER_UP,M-DOWN> mtu 1500 state UP
    inet6 2604:a880:2:d0::a02:f002/124 scope global flags 02
       valid_lft forever preferred_lft forever
    inet6 fe80::42:acff:fe11:2/64 scope link
       valid_lft forever preferred_lft forever

And when I execute:


The result is:

--- ping statistics ---
9 packets transmitted, 0 packets received, 100% packet loss

Can somebody help me?

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The fixed-cidr-v6 subnet should be minimum /80