A chassis switch including a network interface card is provided. The network interface card includes a first Virtual Local Area Network (VLAN) ID to a first packet originating from an internal Internet Protocol (IP) address, to prevent the first packet from being forwarded to the outside of the chassis switch. In addition, the network interface card further includes a second VLAN ID to a second packet originating from an external IP address, to allow the second packet to be forwarded to the outside of the chassis switch.