LXC NIC Passthrough
On the rare occation you have a good reason to forgo the small overhead of an veth (Virtual Ethernet) device connected to an ethernet bridge it is possible to pass a physical network interface directly to a LXC host.
To pass a physical device you just need to provide
lxc.net.[index].link parameters in the LXC config. You may optionally provide a name for the link as well with
lxc.net.[index].name. Just be sure your index value is unique among all network interfaces fot the LXC container including those Proxmox may add if you running your LXC hosts on Proxmox.
lxc.net.0.type: phys lxc.net.0.link: enp1s0 # optional lxc.net.0.name: eth0