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Why would you need two nics unless you’re planning on having a proxmox Vm being your router?
I think two NICs is required to do VLANing properly? Not 100% sure.
Nope - Proxmox lets you create VLAN trunks, just like a physical switch.
Edit: here's one of my Proxmox server network configs.
Is there a reason to do this over just giving the nic for the vm/container a vlan tag?
You still need to do that, but you need the Linux bridge interface to have VLANs defined as well, as the physical switch port that trunks the traffic is going to tag the respective VLANs to/from the Proxmox server and virtual guests.
So,
vmbr1maps to physical interfaceenp2s0f0. Onvmbr1, I have two VLAN interfaces defined -vmbr1.100(Proxmox guest VLAN) andvmbr1.60(Phsyical infrastructure VLAN).My Proxmox server has its own address in vlan60, and my Proxmox guests have addresses (and vlan tag) for vlan100.
The added headfuck (especially at setup) is that I also run an OPNsense VM on Proxmox, and it has its own vlan interfaces defined - essentially virtual interfaces on top of a virtual interface. So, I have:
enp2s0f0(physical)vmbr1(Linux bridge)vmbr1.60(Proxmox server interface)vmbr1.100(Proxmox VLAN interface)vtnet1(OPNsense "physical" nic, but actually virtual)vtnet1_vlan[xxx](OPNsense virtual nic per vlan)All virtual guests default route via OPNsense's IP address in vlan100, which maps to OPNsense virtual interface
vtnet1_vlan100.Like I said, it's a headfuck when you first set it up. Interface-ception.
The only unnecessary bit in my setup is that my Proxmox server also has an IP address in vlan100 (via
vmbr1.100). I had it there when I originally thought I'd use Proxmox firewalling as well, to effectively create a zero trust network for my Proxmox cluster. But, for me, that would've been overkill.