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http://sce.uhcl.edu/yang/teaching/.../VPN.ppt

18

Layer 2 Tunneling Protocol

Types of L2TP Tunnels

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Compulsory L2TP Tunneling

The client is completely unaware of the presence of an L2TP connection.

The L2TP Access Concentrator (LAC) is aware of L2TP.

Figure 12-3: (client) PPP + Data   (LAC)  L2TP + Data (LNS)

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Voluntary L2TP Tunneling

The client is aware of the presence of an L2TP connection.

The LAC is unaware of L2TP.

Figure 12-4: (client) PPP + L2TP + Data (LAC) L2TP + Data (LNS)

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