clients cannot connect to VLAN network

[molnart]

I want to set up separate VLANs for my home network.

I did set up the new interface, assigned it to my LAN port, define subnet range, configured DHCP, changed switch settings, set up a separate SSID for the VLAN and connected few devices for testing. Everything seemd to work, when suddenly all devices connected droppped from the network and i wasn't able to reconnect them anymore.

So I have decided to start from scratch. Removed the VLAN interface, created a new one from scratch and in order to rule out switch malconfiguration i started to try the VLAN first via a Proxmox VM that is hosting my OPNsense instance as well.

So the current state is:
- VLAN interface configured, DHCP set up
- switch config untouched
- Proxmox VM hooked up to the Proxmox internal LAN port, interface is set as VLAN aware and tagged with the VLAN id.
- Firewall rules copied over from the LAN interface, so VLAN should be able to reach full internal network and internet as well (for testing purposes)

The problem is the following:
- the virtual machine does not get an IP address assigned in DHCP mode
- when setting static IP within the VLAN subnet, VM cannot ping gateway or anything else

Any idea how to troubleshoot this/what to look for in the logs?

Thanks