How To Create VLANs in Proxmox For a Single NIC

In the video below, we show you how to configure Proxmox to support VLANs on a single NIC

We show you how to re-configure the management interface created during the installation so that it is in your management VLAN

NOTE: Because we are switching to VLANs, the hypervisor will now no longer be accessible. However, connectivity will be restored in the next step so make sure you have the means to modify the network switch attached to the hypervisor

Then we cover how to configure a network switch to support the VLAN tagging that Proxmox will now be doing

Next, we show you how to add additional VLAN interfaces to Proxmox so it can access shared storage for instance

And then how to configure virtual machines to support VLAN tagging

Useful links: https://pve.proxmox.com/wiki/Network_Configuration#_vlan_802_1q

Steps taken

1. Configure Proxmox
   The default installation creates a dedicated management interface so we need to reconfigure Proxmox with a management VLAN interface instead and make the Linux bridge VLAN aware
   The quickest way is to edit the /etc/network/interfaces
   For example,
   

   cp /etc/network/interfaces /etc/network/interfaces.bak
   nano /etc/network/interfaces

   auto lo
   iface lo inet loopback
   
   iface enp0s25 inet manual
   
   auto vmbr0.100
   iface vmbr0.100 inet static
   	address 192.168.100.10/24
   	gateway 192.168.100.254
   
   auto vmbr0
   iface vmbr0 inet manual
   	bridge-ports enp0s25
   	bridge-stp off
   	bridge-fd 0
   	bridge-vlan-aware yes
   	bridge-vids 2-4092

   Then we reboot Proxmox to make sure the changes are applied

2. Configure Switch
   Because Proxmox is now doing VLAN tagging but the network switch is not, we cannot access Proxmox remotely anymore so we need to reconfigure the switch port
   We need to turn the port into a trunk port i.e. one which supports multiple VLANs and set the default, PVID or native VLAN to something unused
   Once this is done, the switch will send VLAN tagged traffic to Proxmox and our connection will be restored

3. Add VLAN interfaces to Proxmox
   Proxmox will now have a VLAN aware bridge, which means we can add VLAN interfaces to it to give it direct access to a storage VLAN for instance
   To do this select the computer in the left hand pane, navigate to System | Network and from the Create drop down menu select Linux VLAN
   Change the name to match the bridge and VLAN ID, for example for VLAN 200, we’d use vmbr0.200
   Give the interface an IP address and mask, for example, 192.168.200.10/24
   Then click Create
   On the switch, update the port connected to Proxmox to allow this VLAN
   Proxmox should now have access to other computers on your network in this VLAN

4. Assign VMs to VLANs
   Because Proxmox and the switch are using VLAN tagging, virtual machines will need to support these as well
   For existing virtual machines, select the VM in the left hand pane then select Hardware
   Click on the Network Device then click Edit
   In the VLAN Tag field, enter the VLAN ID then click OK
   On the switch, update the port connected to Proxmox to allow this VLAN if that hasn’t already been done
   You will need to repeat this for any other interfaces the VM has
   For new virtual machines, you can add the VLAN tag as part of the installation process when you get to the Network tab

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