Proxmox host/client iface

client.conf

auto lo
iface lo inet loopback

# The primary network interface
auto eth0
iface eth0 inet static
	address 10.0.1.2
	netmask 255.255.255.0
	gateway 10.0.1.1

host.conf

auto vmbr0
iface vmbr0 inet static
	address <PUBLIC_IP>
	netmask 255.255.255.224
	gateway <PUBLIC_IP>
	bridge_ports eth0
	bridge_stp off
	bridge_fd 0

auto vmbr2
iface vmbr2 inet static
        address 10.0.1.1
        netmask 255.255.255.0
        bridge_ports none
        bridge_stp off
        bridge_fd 0