L2TP and IPSec define control and data messages used for L2TP/IPSec. Figure 24 shows an L2TP control frame encapsulated by IPSec. The shaded area shows the encrypted portion of the frame.
Figure 24: L2TP Control Frame Encapsulated by IPSec
Figure 25 is an L2TP data frame encapsulated by IPSec. The shaded area shows the encrypted portion of the frame.
Figure 25: L2TP Data Frame Encapsulated by IPSec
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