Expertise

IPv6

Providing New Services under IPv6

While developing the VoIPv6 platform, the main focus was on providing reliable conferencing services in IPv6 networks. Migration from traditional PSTN/ISDN systems to an IP environment gives users several benefits, including flexibility, ease of implementation and integration with high-level applications. Reliability of the proposed solution, assured through fault detection and, if needed, restoring the conference sessions, was proved in a test-bed environment. The solution also features load balancing of the newly initialized and restored conference sessions on the media servers. The restoring mechanism relocates conferences, considering media mixing and management separation, to one of available media servers.

Speeding Up Migration to IPv6

  • The goal is to accelerate the process of migration from IPv4 to IPv6
  • Application primarily addressed to the SOHO network administrators (further expansion is possible)
  • Capability of easy extension of the knowledge base by a primary development team with multiple independent contributors
  • Validation of correctness in compliance with RFC
  • Multiple operating systems (Windows, Linux, FreeBSD, possibly Mac OS)

Bridging Two IP Worlds

Dibbler: IPv6 Autoconfiguration with DHCPv6

The Dibbler project is an open source, portable implementation of the DHCPv6 protocol, providing client, server, relay and requestor software. Currently available are ports for Linux, Mac OS and Windows based systems Impact on IETF standardization: members of the development team are co-authors of RFC 6334 and RFC 7031.

Wireless Networks

IEEE 802.16d and IEEE 802.16e WiMAX Pilots

Design and deployment of metropolitan-range testbeds of both nomadic and mobile versions of WiMAX technology in cooperation with Alvarion and Alcatel-Lucent companies. Extensive testing of the above versions in real-world operational conditions as an infrastructure for a diverse set of applications.

Mobility Management

Proxy Mobile IPv6 Implementation

An original, research-oriented implementation of the Proxy Mobile IPv6 protocol. Its most attractive feature is the lack of Mobile Host network stack modification requirement. In the proposed testbed, functional qualitative tests and measurements of handover effectiveness have been performed.

Diameter Extension for PMIPv6 Domain and Cross-Layer Integration Using the MIH Protocol

The implementation covers the issues of basic PMIPv6 functionality adding several security extensions to the protocol, namely the usage of the Diameter protocol and IPSec along with handover effectiveness improvements. The tests performed also covered the issue of WAN network compliance in an experimental nation-wide environment. Handover optimizations were evaluated using several different objective and opinion-based metrics.

Future Internet

Interworking Router Module

A router module allowing communication between IPv6 QoS Future Internet network and standard IPv6 systems. Utilizes virtualization technologies to provide high flexibility, which allows it to integrate with a wide variety of network systems, mechanisms and protocols. Includes solutions responsible for translation of both user traffic and control information. Implemented as an easily manageable element integrated with the Future Internet management infrastructure.

Non-cooperative Networking Environments

Among the key aspects of distributed autonomic systems, the impact of limited cooperation among constituent entities is particularly visible in mobile ad hoc, sensor, and mesh networks. Similar problems arise in the virtualized infrastructure of the Future Internet, where virtual routers and servers of heterogeneous technologies under distributed multi-provider administration compete for a common communication infrastructure. Models and mechanisms have been investigated and/or designed using game-theoretic and reputation-building methods, with a view of cooperation enforcement the performance degradation it entails. The investigated non-cooperative environments include:

  • resource multihoming, in which rational entities interact by competing for, and selecting modes of access to, multiple available resources, and
  • reputation systems, in which an entity requests a service from a set of other entities under moral hazard conditions.