D-Link DFL-2500 User Guide - Page 232
VPN Protocols & Tunnels
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22 CHAPTER 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) 213