Proxmox VE network configuration is stored in /etc/network/interfaces. The default bridge vmbr0 connects all VMs and containers.
VLAN-Aware Bridge
auto vmbr0
iface vmbr0 inet static
address 192.168.1.100/24
gateway 192.168.1.1
bridge-ports eno1
bridge-stp off
bridge-fd 0
bridge-vlan-aware yes
bridge-vids 2-4094
Use the built-in SDN module (Datacenter → SDN) for complex network topologies with VNets and zones — no file editing required.