Summary
This chapter discussed L2TP as one of the protocols used to create VPNs. L2TP is a useful protocol in some situations, because it allows a simulated PPP connection to the LNS device to be set up. This is a suitable means of creating a VPN, provided that a means of encryption is used to protect the L2TP tunnel. Because it operates at Layer 2, L2TP can carry almost any Layer 3 protocol. This is unlike Layer 3 VPN protocols such as IPsec. However, L2TP has major shortcomings in that it does not provide encryption, integrity, and authentication mechanisms on a per-packet basis. This shortcoming is often overcome by combining L2TP with another protocol, such as IPsec. L2TP was discussed in this chapter using local authentication and authorization ...
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