Bridge-like internet protocol router

Details Bridge-like internet protocol router Bridge-like internet protocol router

H - Electricity

04

L

H04L 12/46 (2006.01)

Patent

CA 2044363

68061-101 BRIDGE-LIKE INTERNET PROTOCOL ROUTER ABSTRACT OF THE DISCLOSURE A device and related method for coupling seg- ments of an extended local area network (LAN) in such a way that message traffic employing inter-network proto- cols such as TCP/IP will be handled without the diffi- culties usually associated with bridges, and without the complexity and expense of full IP router capabili- ty. The device operates like a bridge for non-TCP/IP traffic. For TCP/IP traffic it operates in a bridge- like manner but maintains a database associating extend- ed LAN segment addresses with port numbers in the de- vice, so that packets can be automatically forwarded over a spanning tree connecting the network segments. A host computer in any network segment can address others in different network segments of the extended LAN as though all were in a single LAN. The device of the invention functions to block the flow of ARP messages and to generate ARP replies that render the device of the invention transparent to hosts within the extended LAN. The device is also transparent to true IP routers, which may still be used to effect communication with points outside the extended LAN.

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