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    L2TP/IPsec Control and Data Frames Overview

    L2TP and IPsec define control and data messages used for L2TP/IPsec. Figure 1 shows an L2TP control frame encapsulated by IPsec. The shaded area shows the encrypted portion of the frame.

    Figure 1: L2TP Control Frame Encapsulated by IPsec

    L2TP Control Frame Encapsulated by IPsec

    Figure 2 is an L2TP data frame encapsulated by IPsec. The shaded area shows the encrypted portion of the frame.

    Figure 2: L2TP Data Frame Encapsulated by IPsec

    L2TP Data Frame Encapsulated by IPsec

    Published: 2014-08-12