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Encapsulating Security Payload

Overview#

Encapsulating Security Payload (ESP) is a IP a security extension for IPSec

Encapsulating Security Payload in transport mode does not provide integrity and authentication for the entire IP packet.

Encapsulating Security Payload in Tunnel Mode, where the entire original IP packet is encapsulated with a new packet header added, ESP protection is afforded to the whole inner IP packet (including the inner header) while the outer header (including any outer IPv4 options or IPv6 extension headers) remains unprotected. ESP operates directly on top of IP, using IP protocol number 50.

More Information#

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