Vpn Protocols & Tunnels; Ipsec - D-Link DFL-1600 User Manual

VPN Protocols & Tunnels
22.1

IPsec

IPsec, Internet Protocol Security, is a set of protocols defined by the
IETF(Internet Engineering Task Force) to provide IP security at the
network layer. It is the most widely used standard for implementing VPNs.
IPsec is designed to work for all IP traffic, independently of application.
This approach results in the advantage that neither the applications nor the
users need to know any details about the encryption.
IPsec uses Diffie-Hellman key exchange protocol and asymmetric encryption
to establish identities, preferred algorithms, and a symmetric key. Then,
the algorithm uses the symmetric encryption scheme to encrypt data as it
is transferred.
Before IPsec can begin encrypting and transferring the data stream, some
preliminary negotiation is necessary. This is accomplished with the Internet
Key Exchange Protocol (IKE).
In summary, an IPsec based VPN, such as D-Link VPN, is made up by two
parts:
Internet Key Exchange protocol (IKE)
IPsec protocols (AH/ESP/both)
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