The present invention relates to a source address verification system for detecting and blocking source address manging / modulating packets, in which a sender uses a self-asserted ID to assure that the sender has a valid address without the assistance of a third party or an individual In this way, it is possible to perform verification of the source of the packet, detect whether the source address of the packet is originally changed in the network layer, and to forward only the normal packet from the source address in the router, And to defend against the attack.
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