[6.12.3] Docker ignores IPv6 addresses

Docker does not accept an IPv6 gateway which is a link local address (fe80::...)

 

You need to change the gateway of br0.69 to something like: 2003:df:1f2c:8e45::1 (of course your router must have this address), like your correct example: fd4f:71d8:b745:45::1

 

Alternatively: if you are using SLAAC, leave the gateway setting empty, and SLAAC will fill-in the link local address, which is then accepted by Docker (weirdness of Docker).

 

Thanks for reporting an issue. I can confirm SLAAC IPv6 auto assignment doesn’t work as well

2 hours ago, Freender said:

Thanks for reporting an issue. I can confirm SLAAC IPv6 auto assignment doesn’t work as well

So that I get this right, this is a 6.12.3 specific issue? 

8 hours ago, bonienl said:

Docker does not accept an IPv6 gateway which is a link local address (fe80::...)

 

You need to change the gateway of br0.69 to something like: 2003:df:1f2c:8e45::1 (of course your router must have this address), like your correct example: fd4f:71d8:b745:45::1

 

Alternatively: if you are using SLAAC, leave the gateway setting empty, and SLAAC will fill-in the link local address, which is then accepted by Docker (weirdness of Docker).

 

So do I understand correctly, this is an Issue?

 

So, then what changed compared to 6.12.2 then? I have everything on auto-configuration, all addresses get advertised and Docker chooses the fd::/8 ULA Address for its assignments. And it works flawless. on 6.12.3, docker straight refuses to use IPv6 and in the "docker inspect network" command it clearly shows:

Quote

"EnableIPv6": false,

1 hour ago, MaZeC said:

So, then what changed compared to 6.12.2 then? I have everything on auto-configuration, all addresses get advertised and Docker chooses the fd::/8 ULA Address for its assignments. And it works flawless. on 6.12.3, docker straight refuses to use IPv6 and in the "docker inspect network" command it clearly shows:

 

There is indeed a regression error in 6.12.3.

The docker networks are created without IPv6 subnets. From your log:

Jul 16 21:23:21 Z-Storage rc.docker: created network br0 with subnets: 10.1.2.0/24; 
Jul 16 21:23:22 Z-Storage rc.docker: created network br0.69 with subnets: 10.10.0.0/24; 

 

I made a fix and tested this.

Jul 17 09:55:24 flora rc.docker: created network br0 with subnets: 10.0.101.0/24; 2a02:xxxx:xxxx:101::/64; 
Jul 17 09:55:25 flora rc.docker: created network br0.6 with subnets: 10.0.106.0/24; fd4f:71d8:b745:45::/64; 

 

Docker network

# docker network inspect br0.6
[
    {
        "Name": "br0.6",
        "Id": "67e3be2092a4ec3e618f2c8088aad5148fcba6c1ac54e37c8c5029bd0d557f0b",
        "Created": "2023-07-17T09:55:25.314164209+02:00",
        "Scope": "local",
        "Driver": "ipvlan",
        "EnableIPv6": true,
        "IPAM": {
            "Driver": "default",
            "Options": {},
            "Config": [
                {
                    "Subnet": "10.0.106.0/24",
                    "Gateway": "10.0.106.1",
                    "AuxiliaryAddresses": {
                        "server": "10.0.106.21"
                    }
                },
                {
                    "Subnet": "fd4f:71d8:b745:45::/64",
                    "Gateway": "fd4f:71d8:b745:45::1",
                    "AuxiliaryAddresses": {
                        "server6": "fd4f:71d8:b745:45:ae1f:6bff:fee4:7c6a"
                    }
                }
            ]
        },

 

I guess for the time being, you need to stay on 6.12.2 until a new version is released.

 

 

Thank you for your reply. Great to see this getting fixed. I will try the new version as soon as it releases, or there is an rc available. Have a great day 🌞!

Met the same problem. Thank bonienl for pointing out that it works on 6.12.2.

 

Temporary workaround:

• Stop Docker service in Settings/DockerSettings.
• Replace /usr/local/etc/rc.d/rc.docker line 282 (From Unraid 6.12.3) :

IPV6=$(ip -br -6 addr show $NETWORK scope global|awk '{print $3}')

With (From Unraid 6.12.2) :

IPV6=$(ip -6 addr show $NETWORK mngtmpaddr|awk '/^ +inet6 /{print $2;exit}')
[[ -z $IPV6 ]] && IPV6=$(ip -6 addr show $NETWORK scope global permanent|awk '/^ +inet6 /{print $2;exit}')

• Start Docker service.

 

Not sure, but the edit might not persist after reboot.