L2TP/IPsec Control and Data Frames Overview

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

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

L2TP Data Frame Encapsulated by IPsec

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