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Because IPSec is integrated at the Internet layer (layer 3), it provides security for almost all protocols in the TCP/IP suite, and because IPSec is applied transparently to applications, there is no need to configure separate security for each application that uses TCP/IP.
In tunnel mode, an IPSec header (AH or ESP header) is inserted between the IP header and the upper layer protocol. Between AH and ESP, ESP is most commonly used in IPSec VPN Tunnel configuration.The packet diagram below illustrates IPSec Tunnel mode with ESP header : ESP is identified in the New IP header with an IP protocol ID of 50.The packet diagram below illustrates IPSec Tunnel mode with AH header :The AH can be applied alone or together with the ESP, when IPSec is in tunnel mode. AHâs job is to protect the entire packet.PSec transport mode is usually used when another tunneling protocol (like GRE) is used to first encapsulate the IP data packet, then IPSec is used to protect the GRE tunnel packets. IPSec protects the GRE tunnel traffic in transport mode.