Virtual Private Networks (VPNs) provide a cost-effective way for securing communications using public and insecure networks like the Internet. The main purpose of a VPN is to securely and transparently connect two or more remote networks to form virtually a single network, using centralized security policies for better management and protection. However, in certain scenarios, users may not requ...

Network virtualization provides a promising tool to allow multiple heterogeneous virtual networks to run on a shared substrate network simultaneously. A long-standing challenge in network virtualization is the Virtual Network Embedding (VNE) problem: how to embed virtual networks onto specific physical nodes and links in the substrate network effectively. Recent research presents several heuris...

User-accessed Virtual Private Network systems allow authorized users remote access to protected or otherwise privileged networks while avoiding dependence on ISPs along the route for data confidentiality and integrity. This direct expression of the internet’s end-to-end principle of security is generally accepted as a highly successful design. VPN services and technology advertising censorship ...

This chapter is devoted to Virtual Private Networks (VPNs) designed with Multi Protocol Label Switching (MPLS) [14, 15, 1], one of the most elusive protocols of the network stack. Saying that MPLS is “elusive” is not overemphasizing: starting from its arduous fitting within the ISO/OSI protocol stack, continuing with its entangled relationships with several other routing and forwarding protocol...

We extend traditional Virtual Private Networks (VPNs) with fault-tolerance and dynamic membership properties, deening a Dynamic Virtual Private Network (DVPN). We require no new hardware and make no special assumptions about line security. An implementation exhibits low overheard, provides guarantees of authenticity and conndentiality to any IP application running over the virtual network. Our ...

The current internet is commonly perceived as being too inflexible. Network Virtualization has been recognized lately as a method to overcome these limitations. Previous implementations of Virtual Network (VN) deployment software either provided limited access to the network layer (like PlanetLab), or focused only on specific application scenarios (like VNUML or VLAN). A first step toward the e...

Virtual informal communication networks are widely recognized as an important part of corporate knowledge management (KM). Unfortunately, most practices of community-engineering are characterized by intuitive actions from KM managers rather than systematic network development based on detailed analysis. Therefore, as part of a larger research framework, this paper addresses topological structur...

This proposal describes the Virtual Active Network (VAN) Architecture. A VAN is a dynamically constructed virtual network that provides application specific services, such as web caching, multicasting, and transcoding, etc. The goal of a VAN is to enable large scale network applications to control and configure network topology and resources to best support their needs. The key results of this ...

Service providers have been motivated to develop and offer new services to their customers. The key question is what kind of futuristic and practical services customers need. This paper presents a novel service called Virtual Private Active Network (VPAN) which allows clients to create Virtual Private Networks (VPNs) among domains using Active Network (AN) technology. This service is new in the...