The meaning of tunnel in the tunnel model of IPSec is that
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the IPSec packets are passing through a secure cable shielded from other traffic. |
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the protected IP packets are inside another IP header (the outer header) and the outer headers of many IP packets can be visualized as making a tunnel wall through which the inner IP packets are passing. |
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the cable is secured so that the IP packets do not need to be secured. |
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IPSec replaces IP and the higher layer protocols' packets (TCL, UDP) are the payload of IPSec instead of IP. |
ANSWER
the protected IP packets are inside another IP header (the outer header) and the outer headers of many IP packets can be visualized as making a tunnel wall through which the inner IP packets are passing.
EXPLANATION
The default mode is the IPSec tunnel mode. So, it does the above function.
The meaning of tunnel in the tunnel model of IPSec is that the IPSec packets are...
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