Configure Dual Uplink (Ethernet/WiFi) on Proxmox

Configures a Proxmox host to switch between an Ethernet primary uplink and a WiFi standby without reconfiguring running VMs or disrupting VLAN routing. Covers the dual-stanza interfaces layout, Ethernet-active baseline, live switchover to WiFi, VLAN gateway continuity verification, and primary restoration. The pattern underpins the Ethernet/WiFi Uplink Failover runbook used during site maintenance.

What this covers:

• Dual-stanza /etc/network/interfaces layout for Ethernet-primary and WiFi-standby uplinks
• Live uplink switchover procedure with VLAN subinterface continuity verification
• WiFi credential configuration via wpa_supplicant integrated with Debian networking

Learn this in Academy: Networking Foundations track