Several VLANs on one NIC for VM-Guests

[Florian1]

Hi all,

am new to Proxmox and wondering how I can setup several VLANs for one guest-VM.
This guest VM will be used as proxy and firewall between several networks.

So, the server itself has two hardware interfaces. Interface 1 is used as the mangement network port
Interface 2 shall be used for guest-VMs sitting on several different VLANs

The server is connected via two hardware network cables to a Netgear switch.
On the switch, interface 1 is configured to auto-tag all incoming networks packts as "VLAN100"
On the switch interface 2 will be used for "VLAN100" "VLAN110" and "VLAN120" (without auto-tagging)

As of today, only interface 1 (Management) is configured:

cat /etc/network/interfaces


auto lo
iface lo inet loopback

iface eno1 inet manual

auto vmbr0

iface vmbr0 inet static

        address 172.18.0.3/16

        gateway 172.18.0.250

        bridge-ports eno1

        bridge-stp off

        bridge-fd 0

iface idrac inet manual

iface eno2 inet manual

So, how can I bring up interface 2, so that I can map the individual VLANs from interface 2 onto the VMs?
Can someone provide a step-by-step guide?