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Solaris 8 Security by Edgar Danielyan

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IPsec Tunneling

In tunneling mode, IPsec protects the entire IP packet using ESP and/or AH and puts it inside another IP packet (this process is known as encapsulation). This way, the entire IP packet, not just its payload (the contained protocol and the user data), is protected. Figure 9.5 illustrates IPsec in tunneling mode.

Figure 9.5. IPsec in tunneling mode (structure of the packet).

In tunneling mode, source and destination addresses in the outer and inner IP headers might match but also might differ. When they match, this scheme is called self-encapsulation. When they don’t, this probably means that a Virtual Private Network is used. ...

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