In ipsec's TRANSPORT mode, the data within an ip packet is encrypted, but the header information is not.
IPSec transport mode is known to be often used if a given tunneling protocol (like GRE) is used to try and encapsulate the IP data packet, and later on, IPSec act as a form of protection for the GRE tunnel packets.
Therefore, In ipsec's TRANSPORT mode, the data within an ip packet is encrypted, but the header information is not.
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