Seeking a suitable VPN solution

This essay is very useful for some people who work in RS field.There are 3 VPN solutions, users can choose according to their own situation. The three solutions are: Remote Access Virtual Network (AccessVPN), Enterprise Internal Virtual Network (IntranetVPN) and Enterprise Extended Virtual Network (ExtranetVPN). These three types of VPNs are respectively associated with traditional remote access networks and intra-enterprise intranets and the extranet of the corporate network and the corporate network of the relevant partners.

n We can consider using AccessVPN if there is necessary for internal staff moves or work remotely for a company or if the merchant wants to provide B2C secure access services. AccessVPN provides remote access to the corporate intranet or extranet through a shared infrastructure that has the same policies as the private network. AccessVPN enables users to access corporate resources in the way with when and where they need it. AccessVPN includes analog, dial-up, ISDN, digital subscriber line (xDSL), mobile IP and cable technologies to secure the connectivity with mobile users, remote workers or branch offices. Diagram 1 explained the above.

AccessVPN is most suitable for those situations where there are frequent mobile workers working remotely within the company. Traveling employees can make use of the local ISP and establish a private tunnel connection with the company's VPN gateway. The RADIUS server authenticates and authorizes employees to ensure the security of the connection, while the cost of the International Direct Dial (IDD) is greatly reduced as users may able to chat even by video or voice through communication application like Skype for business, Lyncs or other kinds of messengers.

The attractive points of AccessVPN to users:

u Reduce capital and expense for associated modems and terminal services devices, simplifying the network

u Achieve the function of local dial-up access instead of long-distance access, which can significantly reduce the cost of long-distance communication

u Great scalability for easy scheduling of new users joining the network

u Remote Authentication Dial-In User Service (RADIUS) standard and policy-based security services can be further enhance

u Core business of the company can be permeate to those staffs which is focusing on work with managing and retaining

n By using of IntranetVPN, this is the best practice if we want to interconnect the various branches within the enterprise. Enterprises establishing various offices, branches, research institutes, etc. in different countries of world becomes popular. The traditional network connection between branches is generally using lease line circuit. Obviously, when the number of branches increases and the business develops growth with further expansion, the network structure tends to be complicated and expensive. The VPN feature allows you to set up a worldwide intranet VPN on the Internet. The Internet is used to ensure the interconnectivity of the network and the VPN features such as tunneling and encryption can ensure the secure transmission of information over the entire intranet VPN. IntranetVPN connects corporate headquarters, remote offices, and branch offices through a shared infrastructure that uses dedicated connections. Enterprises have the same policies as private networks, including security, quality of service (QoS), manageability, and reliability as shown in diagram 2.