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How to for L2TP Server/Client
Please Refer to PPTP.
IPSec
Internet Protocol Security (IPSec) is a protocol suite for securing Internet Protocol (IP) communications by
authenticating and encrypting each IP packet of a communication session. IPsec also includes protocols for
establishing mutual authentication between agents at the beginning of the session and negotiation of
cryptographic keys to be used during the session.
IPSec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite. It can be
used in protecting data flows between a pair of security gateways (network-to-network), or between a security
gateway and a host (network-to-host).