configure network interface without IP

Hi all,

I have two NIC in my proxmox server, one NIC connet to LAN1 and other NIC connected LAN2.

I want to manage my server trougth LAN1, I have assigned an IP to this interface.
Other interface connect to Laboratori LAN, I don't want this interface assigned IP, but I want some VM navigate througth the laboratory network.

The interface LAN1 only need to manage the server.
The interface LAN2 is connectet to a switch, this switch has configured the VLAN2.

I need configure this:

LAN2 Interface should not have IP.
The VM should be able to navigate through the interface connected to the LAN2.
VM connected to LAN2 can not access or visibility to LAN1

This is posible? Can you help me?

thanks!

P.D: Sorry for my english ;)