ABSTRACT:
A Virtual Private Network (VPN) is a private network that uses a public network (usually the Internet) to connect remote sites or users together. Instead of using a dedicated, real-world connection such as leased line, a VPN uses "virtual" connections routed through the Internet from the company's private network to the remote site or employee.
As its name implies, Virtual Private Network (VPN) technologies allow a secure/private communication channel to take place between two separate parties across an untrusted network (e.g. the Internet). The term “virtual” used in VPN technologies signifies that the communication channel for ensuring privacy of traffic data is not constructed by a real physical cable, linking the communicating parties.
There are two common VPN types:
• Remote-access - Also called a Virtual Private Dial-up Network (VPDN), this is a user-to-LAN connection used by a company that has employees who need to connect to the private network from various remote locations. With just a local phone call to an Internet service provider, a user can have access to the company’s private network.
• Site-to-site - Through the use of dedicated equipment and large-scale encryption, a company can connect multiple fixed sites over a public network such as the Internet. Site-to-site VPNs can be either:
Intranet-based - If a company has one or more remote locations that they wish to join in a single private network, they can create an intranet VPN to connect LAN to LAN.
Extranet-based - When a company has a close relationship with another company (for example, a partner, supplier or customer), they can build an extranet VPN that connects LAN to LAN, and that allows all of the various companies to work in a shared environment.
As its name implies, Virtual Private Network (VPN) technologies allow a secure/private communication channel to take place between two separate parties across an untrusted network (e.g. the Internet). The term “virtual” used in VPN technologies signifies that the communication channel for ensuring privacy of traffic data is not constructed by a real physical cable, linking the communicating parties.
There are two common VPN types:
• Remote-access - Also called a Virtual Private Dial-up Network (VPDN), this is a user-to-LAN connection used by a company that has employees who need to connect to the private network from various remote locations. With just a local phone call to an Internet service provider, a user can have access to the company’s private network.
• Site-to-site - Through the use of dedicated equipment and large-scale encryption, a company can connect multiple fixed sites over a public network such as the Internet. Site-to-site VPNs can be either:
Intranet-based - If a company has one or more remote locations that they wish to join in a single private network, they can create an intranet VPN to connect LAN to LAN.
Extranet-based - When a company has a close relationship with another company (for example, a partner, supplier or customer), they can build an extranet VPN that connects LAN to LAN, and that allows all of the various companies to work in a shared environment.
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