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Many people don't know the difference between DVPN and VPDN. Here have a simple introduction.
The full name of DVPN is Dynamic Virtual Private Network, through dynamically receive the peer end information to establish VPN connection. DVPN is an extension of the VPN technology, the traditional VPN technology is mainly used static address to set up fixed tunnel connection, and buildup VPN network. DVPN is used to solve the limitation of the VPN network technology.
DVPN technology has two kinds of realization, one is based on VAM (VPN address management), usually use the private protocol to realize, and the same factory devices composed a DVPN domain, by VAM Server unified manage to intra-domain DVPN; Another is based on DDNS technology plan, DVPN device through DDNS protocol to position the targeted communication device.
VPDN full name is Virtual Private Dial Network, which is use public Network (such as ISDN and PSDN of narrowband, ADSL, PPPoE broadband of and so on) dial-up function and access Network to realize Virtual Private Network. Provide access service for the enterprise, small ISP, mobile office personnel. Common VPDN technology has L2TP, PPTP, L2F, L2TP over IPSec and so on.
In short, DVPN and VPDN is the expansion of the VPN technology, DVPN technology mainly solves the connection target positioning problem in dynamic address assignment case, and VPDN mainly use the dialing technology to solve the on-demand access problem. In practical application, often use them together as a combination.
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