Which is the correct packet encapsulation order for L2TP over IPSec?
The order from the first package to the post package is PPP-->UDP-->L2TP-->IPSec
The order from the first package to the back package is PPP--> L2TP-->UDP--> IPSec
The order of C from pre-package to post-encapsulation is IPSec --> L2TP-->UDP--> PPP
The order of D from pre-package to post-encapsulation is IPSec --> PPP --> L2TP-->UDP
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