Repeaters for secure local area networks
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United States of America Patent
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Oct 13, 1998
Issued Date -
N/A
app pub date -
Jan 30, 1995
filing date -
Dec 6, 1989
priority date (Note) -
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Abstract
A multiport repeater for a local area network installation has (in addition to its conventional functions) 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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