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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.
If the crypto tunnel transits either a Network Address Translation (NAT) or Port Address Translation (PAT) device, tunnel mode is required. In addition, this design guide shows configuration examples for implementing p2p GRE over IPsec where the p2p GRE tunnel endpoints are different than the crypto tunnel endpoints.