Converting Interface From Physical To VLAN

[jarodmerle]

I'm in the process of migrating my OPNsense installation from one virtualized host to another (both Proxmox).  On the old host, I have 4 physical network ports, one of which is dedicated as an interface for some "public-facing" servers (subnet 192.168.200.0).  On my new host, I only have two network ports, which I didn't expect to be a problem, thinking I could easily just convert the "physical" Interface over to a new VLAN under the main physical LAN interface.  I already have 3 other VLANs setup this way (Main/VLAN 2, Isolated/VLAN 10, and Guest/VLAN 20) with no issues.  I decided it was best to make this switch before migrating over to my new Proxmox host to keep things as clean as possible.  Unfortunately, when I create a new VLAN (vtnet1_vlan200), and assigned it to my "Public" interface, my servers become unreachable (outside of the console within Proxmox) and have no internet connectivity.  I switch back to the physical interface (vtnet2) and it goes back to working just fine. Things I've tried/checked (multiple times):

- Setting up the new VLAN and reassigning the interface via both the web GUI and console
- Double-checking firewall rules pertaining to this interface
- Disabling/re-enabling firewall rules to see if that resyncs anything
- Checked firewall logs and don't see anything that seems to indicate connections are blocked, but I could be misreading them
- Restarting all of my VMs multiple times
- Ensured that I've reassigned the appropriate virtual network device to the public servers in Proxmox
- Various tweaks in my network controller software (Omada) to see if that has anything to do with it

I'm sure there must be something I'm just missing, and it may not be in OPNsense itself, but it seemed the best place to start (and I know there's a lot of this community familiar with running it on Proxmox as well).  I've searched and read through various postings, and none quite line up with what I'm trying to do.

Any assistance would be greatly appreciated, and happy to provide any other details about my configuration that might help.