I just spent five hours in a networking horror show deep in Linux networking and VLANs. tl;dr: be very aware of what VLANs your upstream switch port is tagging vs which it has native. If you tell your downstream server that a VLAN is tagged but it’s actually native, things fail in surprising and painful ways. https://avi.drissman.com/2026/02/a-warning-about-vlans-in-proxmox-or.html
avi.drissman.com
A warning about VLANs in Proxmox or general Linux networkingA heads-up for those working with Proxmox or dealing with ifupdown networking in general. Keyword bait: my Proxmox server sees the network ...

