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Tunneling Technology
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Layer2 forwarding : PPP packet is tunneled across the network
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PPTP - Microsoft (In Win NT)
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L2F - Cisco (Layer 2 forwarding)
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ATMP - Ascend (Ascend Tunnel Management Protocol)
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L2TP - Microsoft / Cisco (Layer 2 Tunneling Protocol)
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Layer3 forwarding
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PPP session is terminated at the remote access server and only the layer3 payload is tunneled
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Mobile IP - IETF (for cellular networks)
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