Abstract: A virtual USB port numbers assigning method, applicable to a client device for generating a virtual port representing an actual port of a remote USB hub. The steps comprise: detecting an electrical device connecting to the actual port; requesting data regarding the actual port and the connected electronic device, such as the MAC address and actual port number of the remote USB hub, and the PID and VID of the electrical device; evaluating the data; and assigning virtual ports according to the evaluation result. By assigning fixed virtual port number to each electrical device, so as to prevent the operating system from repeatedly asking users to install the driver program of the electrical device.

Abstract: A method of communication in LAN without setting IP is provided, especially for LAN with a host device and at least a peripheral device. The method includes: (1) the host device sending the peripheral device a broadcast search packet through LAN, (2) the peripheral device establishing a new routing table according to the packet, (3) the peripheral device returning a response packet containing IP data to the host device, (4) the host device establishing a new routing table according to the response packets returned from peripheral device, and (5) the host device performing wired or wireless LAN communication with peripheral device according to the new routing table. Therefore, the host device and the device can automatically detect IP data even they may belong to different sub-net to achieve the communication in LAN without setting IP.