7.5.5 IPsec Encapsulations

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Windows IPsec supports the following encapsulation modes:

Transport Mode encapsulation: Used for end-to-end IPsec encapsulation between two hosts ([RFC4303] section 3.1.1).

Tunnel Mode encapsulation: Used for an IPsec protected tunnel from a host H to a gateway G ([RFC4303] section 3.1.2).