How to set IPv6 network for connecting to remote host inside local docker container?

General
1

Note: The IPv6 address in this question isn’t the real IP.

There are two servers

  • node1(IPv6: 123a:a4b5:0102:t234:cd90:3:0:2)
  • node2(IPv6: 123a:a4b5:0102:t234:cd91:3:0:2)

On the node1, installed AWX by docker-compose, so the real application is in the container.

It can be connected from node1 to node2

[root@node1] ping6 123a:a4b5:0102:t234:cd91:3:0:2
PING 123a:a4b5:0102:t234:cd91:3:0:2(123a:a4b5:0102:t234:cd91:3:0:2) 56 data bytes
64 bytes from 123a:a4b5:0102:t234:cd91:3:0:2: icmp_seq=1 ttl=64 time=0.319 ms

Run ip -6 route on node1, found

default via 123a:a4b5:0102:t234::ffff dev lan0 metric 1 pref medium

Set 123a:a4b5:0102:t234 in the /etc/docker/daemon.json

{
  "ipv6": true,
  "fixed-cidr-v6": "123a:a4b5:0102:t234::ffff/64"
}

Restart docker. From docker network inspect bridge found

...
        "Scope": "local",
        "Driver": "bridge",
        "EnableIPv6": true,
        "IPAM": {
            "Driver": "default",
            "Options": null,
            "Config": [
                {
                    "Subnet": "172.17.0.0/16",
                    "Gateway": "172.17.0.1"
                },
                {
                    "Subnet": "123a:a4b5:0102:t234::/64",
                    "Gateway": "123a:a4b5:0102:t234::1"
                }
            ]
        },
...

Connected awx_web to docker’s bridge network

docker network connect bridge awx_web

Login to awx_web container check ip, generated this IPv6

441: eth1@if442: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default
    link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.17.0.2/16 brd 172.17.255.255 scope global eth1
       valid_lft forever preferred_lft forever
    inet6 123a:a4b5:0102:t234:0:242:ac11:2/64 scope global nodad
       valid_lft forever preferred_lft forever
    inet6 [secret]/64 scope link
       valid_lft forever preferred_lft forever

It can be ping by itself(123a:a4b5:0102:t234:0:242:ac11:2), but can’t ping the IPv6 on node2

sh-4.4# ping6 123a:a4b5:0102:t234:cd91:3:0:2
PING 123a:a4b5:0102:t234:cd91:3:0:2(123a:a4b5:0102:t234:cd91:3:0:2) 56 data bytes
From 123a:a4b5:0102:t234:cd91:3:0:2: icmp_seq=1 Destination unreachable: Address unreachable

How to config the network to let it work in this case?

4

ipv6 what was it created for? to get rid of hemorrhoids NAT!!! and in docker they offer to do all sorts of crutches again. RAVE!!!