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Last modified: Thursday, September 08, 2005 

Short for Encapsulating Security Payload, the ESP header is designed to provide a mix of security services in IPv4 and IPv6. ESP may be applied alone, in combination with the IP Authentication Header (AH), or in a nested fashion. The ESP header is inserted after the IP header and before the upper layer protocol header (transport mode) or before an encapsulated IP header (tunnel mode). ESP is used to provide confidentiality, data origin authentication, connectionless integrity, an anti-replay service, and limited traffic flow confidentiality. [Adapted from (RFC2406)]

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RFC 2406 
RFC 2406 — IP Encapsulating Security Payload (ESP). This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements.

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