My Mailcow is on Vultr, IPv6 enabled.
All necessary ports are opened on Vultr firewall.
Mailcow is running on Ubuntu 22.04 with ufw disabled.
curl -6 https://ifconfig.co on the server shows a correct IPv6 address.
However, when Mailcow starts, I get email from watchdog saying “enable_ipv6 is true in docker-compose.yml, but an IPv6 link could not be established. Please verify your IPv6 connection.”
How should it be fixed?

Thanks.

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esackbauer

I have read that tutorial. There is no /etc/network/interfaces.d/50-cloud-init.cfg.

This might be a similar file /etc/netplan/50-cloud-init.yaml:

# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.  To disable cloud-init's
# network configuration capabilities, write a file
# /etc/cloud/cloud.cfg.d/99-disable-network-config.cfg with the following:
# network: {config: disabled}
network:
    version: 2
    ethernets:
        enp1s0:
            accept-ra: true
            dhcp4: true
            dhcp6: true
            match:
                macaddress: 56:00:04:8b:5a:87
            set-name: enp1s0

I have not configured Docker. Docker should support IPv6 by default, I believe?
May I know how to configure Docker?

Thanks.

    esackbauer

    I have followed the part “Use IPv6 for the default bridge network”.
    Now IPv6 address could be shown on Mailcow dashboard.
    I think it should work now.

    Thank you very much!

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