Virtual Private Networks

Benefits of VPN Include
Cost Savings - VPNs enable organizations to utilize cost-effective third-party Internet transport to connect remote offices and remote users to the main corporate site, thus eliminating expensive dedicated WAN links and modem banks. Furthermore, the advent of cost-effective, high-bandwidth technologies like DSL, organizations can use VPNs to reduce their connectivity costs while simultaneously increasing remote connection bandwidth.

Security - VPNs provide the highest level of security using advanced encryption and authentication protocols that protect data from unauthorized access.

Scalability - VPNs enable corporations to utilize easy to provision Internet infrastructure with ISPs and devices that allow for the easy addition of new users. Therefore, corporations are able to add large amounts of capacity without adding significant infrastructure.

Compatibility with Broadband Technology - VPNs allow mobile workers, telecommuters and day extenders to take advantage of high-speed, broadband connectivity, such as DSL and Cable, when gaining access to their corporate networks, providing, workers significant flexibility and efficiency. Furthermore, high-speed broadband connections provide a cost-effective solution for connection remote offices.

VPN Applications
VPN is one of the most used words in networking today and has many different meanings. The broadest definition of a VPN is "Any network built upon a public network and partitioned for use by individual customers". This results in public frame relay, X.25, and ATM networks being considered as VPNs. These types of VPNs are generically referred to as Layer 2 VPNs. The emerging form of VPNs are networks constructed across shared IP backbones, referred to as "IP VPNs".

There are fundamentally three different corporate or business uses of VPNs:
* Remote Access VPNs
* Site-to-Site VPNs
* Extranet VPNs

DTI Provides comprehensive design guidance for remote access, site-to-site, and extranet VPNs for all scales of deployments. Implementation decisions vary, depending on the network functionality required. However, the following design objectives, listed in order of priority, guide the decision-making process.
* Secure connectivity
* Reliability, performance, and scalability
* Options for high availability
* Authentication of users and devices in the VPN
* Secure management
* Security and attack mitigation before and after IPSec

First and foremost, a VPN needs to provide private, ubiquitous communications to the locations and users that require it. It must do this in a secure manner while maintaining as many of the characteristics of traditional private WAN connections as possible. It must integrate with the overall network.

Remote Access VPNs:
Provide remote access to a corporate intranet or extranet over a shared infrastructure with the same policies as a private network. Access VPNs enable users to access analog, dial, ISDN, digital subscriber, line (DSL), mobile IP, and cable technologies to securely connect mobile users, telecommuters, or branch offices.

Site-to-Site VPNs
This type of VPN is an alternative WAN infrastructure that is used to connect branch offices, home offices, or business partners' sites to all or portions of a company's network. VPNs do not inherently change private WAN requirements, such as support for multiple protocols, high reliability, and extensive scalability, but instead meet these requirements more cost-effectively and with greater flexibility.

Extranet VPNs
Extranet VPN's link customers, suppliers, partners, or communities of interest to a corporate Intranet over a shared infrastructure using dedicated connections. Businesses enjoy the same policies as a private network, including security, QoS, manageability, and reliability.

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