### Check existing issues - [x] I've verified that this request isn't described by any existing issues. ### Request We need to add the following steps to the setup instructions, after LXD has been set up but before Docker is installed: ``` echo "net.ipv4.conf.all.forwarding=1" \ | sudo tee -a /etc/sysctl.d/99-forwarding.conf sudo systemctl restart systemd-sysctl ``` We also need to: - Include the link to the [LXD documentation](https://documentation.ubuntu.com/lxd/stable-5.21/howto/network_bridge_firewalld/#prevent-connectivity-issues-with-lxd-and-docker) about the known issue. - Add a warning admonition that in a production environment you should have a hardened firewall configuration. - Remove the warning admonition under the first rock-packing with the alternate method. ### Related issues and PRs #598 #1110 ### Document location https://documentation.ubuntu.com/rockcraft/latest/tutorial/