L2TP
L2TP is a combination of the best from PPTP and L2F, and was created by the IETF.
It is meant as a replacement of these two previous protocols.
IPSec
May be used with IPv4 or IPv6.
Two modes of operation are transport mode and tunnel mode.
Tunnel mode verses Transport mode.
Transport mode encrypts the IP payload, and not the original IP headers.
Tunnel mode encrypts the entire IP datagram for higher security.
IPSec uses the following to provide for confidentiality, authenticity, and integrity.
Secret keys are delivered with the Public key method (Diffie-Hellman).
Can guarantee that the secret keys are authentic (Diffie-Hellman).
The IPSec authentication header versus the encapsulation header:
Authentication header (AH) ensures integrity and authenticity, but not confidentiality.
Encapsulation header (EH) protects authenticity, integrity, and confidentiality.
Both AH and EH may be used together or seperately.
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