| 摘要 |
Methods for providing internet-layer addresses from serving devices ( 1 ) via relaying devices ( 4 ) to client devices ( 3 ) comprise the steps of, at the relaying devices ( 4 ), receiving first messages ( 101 a) from the client devices ( 3 ) and second messages ( 102 a) from the serving devices and transmitting further first messages ( 101 b) to the serving devices ( 1 ) and further second messages ( 102 b) to the client devices ( 3 ). To allow the relaying devices ( 4 ) to monitor certain traffic relatively sufficiently, the method is provided with the step of, at the relaying devices ( 4 ), inserting internet-layer (internet protocol=layer-3) addresses defining the relaying devices ( 4 ) into higher-layer (user datagram protocol=layer-4) fields of the further second messages ( 102 b), which higher-layer fields were originally designed for identifying the serving devices ( 1 ). As a result, future messages to be sent from the client devices ( 3 ) to the serving devices ( 1 ) must pass the relaying devices ( 4 ). The higher-layer fields comprise server internet protocol address fields and option-54 fields. The dynamic host configuration protocol messages are discover, offer, request, acknowledge and request and/or renew and/or release messages.
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