!!! Overview
[{$pagename}] ([ESP]) is a [IP] a security extension for [IPsec] 

[{$pagename}] in transport mode does not provide [integrity] and [authentication] for the entire [IP] packet. 


[{$pagename}] 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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