Virtual Private Network Software System
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A Virtual Private Network Software System is a network software system that can create a VPN.
- Example(s):
- Counter-Example(s):
- See: HTTP Proxy, VPN Protocol.
References
2014
- http://en.wikipedia.org/wiki/Virtual_private_network#Type
- Early data networks allowed VPN-style remote connectivity through dial-up modems or through leased line connections utilizing Frame Relay and Asynchronous Transfer Mode (ATM) virtual circuits, provisioned through a network owned and operated by telecommunication carriers. These networks are not considered true VPNs because they passively secure the data being transmitted by the creation of logical data streams.[1] They have been replaced by VPNs based on IP and IP/Multiprotocol Label Switching (MPLS) Networks, due to significant cost-reductions and increased bandwidth[2] provided by new technologies such as Digital Subscriber Line (DSL)[3] and fiber-optic networks.
VPNs can be either remote-access (connecting a computer to a network) or site-to-site (connecting two networks). In a corporate setting, remote-access VPNs allow employees to access their company's intranet from home or while traveling outside the office, and site-to-site VPNs allow employees in geographically disparate offices to share one cohesive virtual network. A VPN can also be used to interconnect two similar networks over a dissimilar middle network; for example, two IPv6 networks over an IPv4 network.[4]
VPN systems may be classified by:
- the protocols used to tunnel the traffic.
- the tunnel's termination point location, e.g., on the customer edge or network-provider edge.
- whether they offer site-to-site or network-to-network connectivity.
- the levels of security provided.
- the OSI layer they present to the connecting network, such as Layer 2 circuits or Layer 3 network connectivity.
- Early data networks allowed VPN-style remote connectivity through dial-up modems or through leased line connections utilizing Frame Relay and Asynchronous Transfer Mode (ATM) virtual circuits, provisioned through a network owned and operated by telecommunication carriers. These networks are not considered true VPNs because they passively secure the data being transmitted by the creation of logical data streams.[1] They have been replaced by VPNs based on IP and IP/Multiprotocol Label Switching (MPLS) Networks, due to significant cost-reductions and increased bandwidth[2] provided by new technologies such as Digital Subscriber Line (DSL)[3] and fiber-optic networks.
- ↑ Cisco Systems, et al.. Internet working Technologies Handbook, Third Edition. Cisco Press, 2000, p. 232.
- ↑ Lewis, Mark. Comparing, Designing. And Deploying VPNs. Cisco Press, 20069, p. 5
- ↑ International Engineering Consortium. Digital Subscriber Line 2001. Intl. Engineering Consortium, 2001, p. 40.
- ↑ Technet Lab. "IPv6 traffic over VPN connections". http://lab.technet.microsoft.com/en-us/magazine/cc138002.