Layer Two Tunneling Protocol

Layer Two Tunneling Protocol (L2TP) is a protocol that combines the features of PPTP with support for IP Security (IPSec) to provide enhanced security. Unlike PPTP, which relies on MPPE for encryption, L2TP relies on IPSec to provide encryption. Therefore, the source and destination routers must support both L2TP and IPSec. Figure 18-3 illustrates how L2TP encapsulates data. L2TP is installed by default when you install Windows Server 2003 RRAS.

Tip L2TP provides better security than PPTP by supporting IPSec. L2TP is a better choice for cre ating VPN connections than PPTP when the remote network is configured to support IPSec.

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