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"When i crated this vlan on one ports then that was working fine, but my main issue is how to configure same vlan on both ports like lan2 and lan3."

But on which device? OPNsense, Switch or Proxmox?

I configured vlan20 on port 2 (LAN2) on opnsense, to this port i connected my AP. With dedicated wireless network with vlan tag 20, its working. Im struggling with configuration to have same vlan 20, on the port 3. OpnSense not allowed assign same vlan tag on different port. So I'm not able to assign vlan20 to port2 and port3 at the same time. Sorry for making that confusing.

switches are managed.

ok, so i need take a look on proxmox. I was thinking when i passthrough this nic interfaces, then i dont need to change nothing in configuration.

When i crated this vlan on one ports then that was working fine, but my main issue is how to configure same vlan on both ports like lan2 and lan3.

Hi all,
sorry for that dummy question but i couldn't find any answer. And I'm ready to buy a beer to person how help me, im just tired trying different solution without any effect. Maybe my conception is wrong. So here its my env.

I have Firewall Computer N100 Soft Router 4x 2.5G, on that device i have proxmox, with opnsense.
I have one bridge on proxmox layer, to port 1. And rest 3 port are connected physically direct to opnsense vm.

WAN
LAN1 = Swtch1
LAN2 = AP
LAN3 = Swtch2

My idea is to have 5 vlans. and here is my problem, how to assign same vlan for example guest vlan20 for both port LAN3 and LAN2. I was trying already to create vlan20-on interface LAN3 and vlan20 on interface lan2.
Its not allowed me to create same vlantag. so i crate vlan21 and vlan20 and made bridge on them. and then on this bridge i assgin dhcp v4 service. But then i didnt recvice any dhcp lease from that vlan on this ports.