What are Transport and Tunnel Modes
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Transport mode, in which data payload is encrypted, but header data is unchanged. Transport mode encrypts data between two hosts that are IPsec-aware and capable of decrypting the payload data directly.
Tunnel mode, in which the entire original packet is encrypted and becomes the payload of a new packet, which then is transmitted between IPsec-aware routers. Tunnel mode enables IPsec-aware routers to encapsulate and encrypt network traffic from non-IPsec-aware hosts, transmit it over an unsecure network, and then decrypt it for use on the destination network by other hosts that are not IPsec-aware.
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Transport mode, in which data payload is encrypted, but header data is unchanged. Transport mode encrypts data between two hosts that are IPsec-aware and capable of decrypting the payload data directly.
Tunnel mode, in which the entire original packet is encrypted and becomes the payload of a new packet, which then is transmitted between IPsec-aware routers. Tunnel mode enables IPsec-aware routers to encapsulate and encrypt network traffic from non-IPsec-aware hosts, transmit it over an unsecure network, and then decrypt it for use on the destination network by other hosts that are not IPsec-aware.
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