Fixing Proxmox “WARN: missing ‘source /etc/network/interfaces.d/sdn’ directive for SDN support!” Rumi, January 25, 2025 When trying to use SDN feature in Proxmox VE (PVE), we get this error SRV networking - Reload WARN: missing 'source /etc/network/interfaces.d/sdn' directive for SDN support! Created symlink /etc/systemd/system/multi-user.target.wants/dnsmasq@testzone.service -> /lib/systemd/system/dnsmasq@.service. TASK WARNINGS: 1 Edit /etc/network/interfaces file to add source /etc/network/interfaces.d/* at the bottom of the file 1 Login to PVE via SSH or via web GUI (https://IP:8006) then open >_Shell 2 Open and Edit /etc/network/interfaces file nano /etc/network/interfaces 3 Add this at the bottom of the file source /etc/network/interfaces.d/* Ctrl + X, Y, Entre key to Save and Exit nano text editor Src: https://dannyda.com/2024/04/09/how-to-fix-proxmox-ve-pve-error-warn-missing-source-etc-network-interfaces-d-sdn-directive-for-sdn-support/ Administrations Collected Articles Proxmox Virtualization ProxmoxProxmox SDNSDN