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A wide area network (WAN) is a computer network that covers a broad area (i.e., any network whose communications links cross metropolitan, regional, or national boundaries). This is in contrast with personal area networks (PANs), local area networks (LANs), campus area networks (CANs), or :metropolitan area networks (MANs) which are usually limited to a room, building, campus or specific metropolitan area (e.g., a city) respectively.

per phuzi0n:
For better performance you should use the VLAN GUI to reassign the WAN port to the same VLAN as the LAN ports. Using the "assign to LAN" option bridges it (software) in br0 which is limited by the CPU instead of switching (hardware) which is limited by the switch ASIC's.
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