Figure 104 ESP

As a designer, the first thing to realize is that almost no one uses AH. All the rest of the designs discussed in this book employ ESP. This is primarily because you get almost every benefit of AH by using ESP. And since ESP offers confidentiality, it is superior from a security standpoint. Even IP header authentication, which ESP doesn't offer in transport mode, is possible in tunnel mode (for the original IP header). ESP uses IP protocol 50 for communication.

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