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CRIPTOGRAFIA - FESP

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Tunnel Mode<br />

Tunnel Mode forms the more familiar functionality, where entire IP packets are<br />

encapsulated inside another and delivered to the destination.<br />

Like Transport mode, the packet is sealed with an Integrity Check Value to<br />

authenticate the sender and to prevent modification in transit. But unlike<br />

Transport mode, it encapsulates the full IP header as well as the payload, and<br />

this allows the source and destination addresses to be different from those of the<br />

encompassing packet: This allows formation of a tunnel.<br />

When a Tunnel-mode packet arrives at its destination, it goes through the same

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