Computer Networks
Access to the Internet and the quality of the access play an important role in our everyday lives . With the integration of different medias (TV, Phone, Internet), computer networks are becoming more and more complex. The monitoring of the actual and past state of a network is critical for troubleshooting, traffic engineering and anomaly detection. We have participated in numerous R&D projects connected to network monitoring and testing. We are currently working an an overlay based network monitoring and anomaly detection framework for very large networks (> 1000 nodes). Below is a short list of the detailed competences and a short description of our activity in the given fields:
- Network monitoring: We have extended the passive measurement framework from CAIDA with delay, jitter, and packet loss measurement capabilities (C@R) and we have developed a framework for monitoring the usage of the psychical resources in wireless networks (C@R)
- Network testing We have developed a system (Netspotter) for distributed network testing, we have conducted measurements to study the vulnerability of the PC based IPv6 multicast networks to DOS or DDOS attacks (Campus6)
- Topology discovery We have developed a novel architecture for network topology discovery (GN2, Campus6). On the top of the network discovery architecture, we have implemented various plug ins for network discovery. (Ethernet level discovery (802.1d-w,802.3ad, 802.1ab) (GN2, Campus6), IP level discovery (Campus6), MPLS level discovery(Campus6), Multicast topology discovery(Campus6)
- Signaling Compression We have developed novel compression algorithms for statci and dynamic SIP compression (SigComp)
- Wireless Mesh Networks: We have a deployed WMN with about 10 nodes (we are going to extend it with 20 nodes). The network is used on a daily basis by end users. We are testing our resource monitoring/management and self organizing network monitoring solutions on this network. (C@R, WMN monitoring )
- WMN-Energy: We've made a research about WMN routing protocol energy consumption measurement using the NS-2 simulation framework, XEEMU and OLSRD as a routing protocol. The results were that the consumption of the software itself is commensurable with the consumption of the signal emittion so it is worth doing further and more detailed measurements in this area.(C@R, WMN Energy)
Projects
- C@R: Collaboration @ Rural
- Geant2
- SigComp
- MCC: Maemo as a Communication Central
- Campus6: IPv6 based campus networks