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Today I fired up a Debian 12 droplet and enabled IPv6. The instructions for setting up IPv6 on Debian must not have been updated for 12 yet (adding an IPv6 block in /etc/network/interfaces does not work) so I used the instructions for Ubuntu 22.04 which uses netplan. This appears to work and persists on reboot.
However, I noticed this comment in the /etc/netplan/50-cloud-init.yaml file:
# 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}
Changes do persist across reboots like I said so I’m not sure what this message is referring to.
I also commented out /etc/network/interfaces and rebooted. Doesn’t look like this file is even used any more on Debian 12.
Not much of a question here, mostly just notes for anyone else setting up Debian 12 droplets with IPv6.
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