Repeaters for secure local area networks

Details Repeaters for secure local area networks Repeaters for secure local area networks

H - Electricity

04

L

340/100

H04L 25/20 (2006.01) H04L 12/22 (2006.01) H04L 12/46 (2006.01) H04L 29/06 (2006.01)

Patent

CA 2029577

A multiport repeater for a local area network installation has (in addition to its conventional functions) means for storing access rules for the items of equipment connected to it. It reads a portion of each frame, which may be all or part of the destination address segment and/or of the source address segment and/or of the control segment of each incoming data frame, or it could be a frame or protocol identifier incorporated in opening bytes of the data segment. It compares the data that it reads with the stored access rules to determine whether the frame is permitted or not. If not, it corrupts the frame which it is in the course of re-transmitting, for example by overwriting it with meaningless digits. It may also report the source address, destination address and reason for deciding to corrupt the frame to the network controller.

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