| CPC H04L 63/0227 (2013.01) [H04L 9/085 (2013.01); H04L 9/30 (2013.01); H04L 63/08 (2013.01); H04L 67/12 (2013.01); H04L 2209/84 (2013.01)] | 13 Claims |
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1. A network interface comprising:
an input port configured to receive messages from a first device or first network;
an output port configured to forward the messages to a second device or second network,
a memory configured for storing a timetable,
wherein the network interface is configured to:
forward messages arriving at the input port, during open times defined by the timetable, to the output port, and
discard messages arriving at the input port, during closed times defined by the timetable;
a configuration unit configured to:
receive and store in the memory a timetable that is defined by a monitoring unit as a shared secret for the network interface and at least one sender of messages, and/or
negotiate a timetable with at least one sender of messages as a shared secret;
a detector configured to detect attempts to deliver messages at the input port during the closed times; and
wherein the configuration unit is configured to:
request a new timetable from the configuration unit in response to one or more attempts detected by the detector, and/or
negotiate a new timetable with the at least one sender of messages, and/or
report an attempt at manipulation via an alarm output.
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