Projects

Open Source Projects Cybersecurity-Fundamentals (《网络空间安全导论》课程配套资源): Github Link
PacketScope: Introduction Link, Github Link
TrafficLLM: Github Link
NetBeacon: Github Link
TrafficFormer: Github Link
Whisper: Github Link
HyperVision: Github Link

Project Title: Dynamic Reconfigurable Router Platform (DRRP) Author(s): Ke Xu   [Resource download ]  Introduction: Dynamic reconfigurable routing platform (DRRP) goal is to develop “visual development environment for router software developers ” according the strategy of reconfiguration implement. That is, to realize a visual, engineering oriented integrated development environment for router software development. Website: http://drrp.weebly.com/
Project Title: SPEF—Toward Optimal Traffic Engineering Author(s): Ke Xu, Meng Sheng [Resource download ] Introduction: Start with viewing the conventional optimal TE problemin a fresh way, i.e., optimally allocating the residual capacity to every link. Then we make an elegant generalization of network utility maximization (NUM) to close this problem, where the network operator, instead of end users, is associated with a utility function of the residual capacity to be maximized. We demonstrate that under this framework, the optimal routes resulting from the optimal TE are also the shortest paths in terms of a set of positive link weights that are explicitly determined by the objective function and the residual capacity. The network entropy maximization theory is employed to enable routers to exponentially, instead of uniformly, split traffic over ECMP. The Shortest-path Penalizing Exponential Flow-splitting (SPEF) is designed as a link-state protocol with hop-by-hop forwarding to implement our theoretical findings. An alternative MPLS-based implementation is also discussed here. Numerical simulation results have demonstrated the effectiveness of the proposed framework as well as SPEF. Reference: Xu K, Liu H, Liu J, et al. One more weight is enough: Toward the optimal traffic engineering with OSPF[C]//Distributed Computing Systems (ICDCS), 2011 31st International Conference on. IEEE, 2011: 836-846.
Project Title: Measurement Study on Cellular Network Performance under High-speed Mobility
Author(s): Ke Xu, Qingyang Xiao, Li Li [Resource download ] Introduction: MobiNet is an application for measuring mobile network performance on Android platform. You can measure your network’s throughput and latency, as well as other useful network metrics. Now MobiNet can support all the network types in China. See here for updated version. Reference: Q. Xiao, K. Xu, D. Wang, L. Li, Y. Zhong. TCP Performance over Mobile Networks in High-speed Mobility Scenarios, in Proceeding of ICNP’14, IEEE, 2014.
Project Title: Research on Network Security Architecture Author(s): Ke Xu, Lei Xu, Fan Yang, Bo Wu, Yudong Zhao Introduction: The project mainly researches the new generation Internet architecture which is based on advanced network security theory and technology, including building entire trust model covering both network and equipment, proposing a method for identifying and restraining abnormal behavior of network equipment, generating a mechanism of anomaly detection about motion coding routing device, strengthening source authentication and path validation in the process of data transmission, and designing optimal credible routing system at the level of routing protocols. It seeks to make security become a kind of service embedded into network itself. Ultimately, it can ensure network safe operation and data reliable transmission from the perspective of architecture.
​Project Title: A Measurement Study on Multi-path TCP with Multiple Cellular Carriers on High-speed Rails Author(s): Ke Xu, Li Li, Tong Li, Kai Zheng, Chunyi Peng, Dan Wang, Xiangxiang Wang, Meng Shen, Rashid Mijumbi Introduction: Recent advances in high speed rails (HSRs) are propelling the need for acceptable network service in high speed mobility environments. However, previous studies show that the performance of traditional single-path transmission degrades significantly during high speed mobility due to frequent handoff. Multi-path transmission with multiple carriers is a promising way to enhance performance, because at any time, there is possibly at least one path not suffering a handoff. In this paper, for the first time, we measure multi-path TCP (MPTCP) with two cellular carriers on HSRs with a peak speed of 310km/h. We find a significant difference in handoff time between the two carriers.
Moreover, we observe that MPTCP can provide much better performance than TCP in the poorer of the two paths. This indicates that MPTCP’s robustness to handoff is much higher than TCP’s. However, the efficiency of MPTCP is far from satisfactory. MPTCP performs worse than TCP in the better path most of the time. We find that the low efficiency can be attributed to poor adaptability to frequent handoff by MPTCP’s key operations in sub-flow establishment, congestion control and scheduling. Finally, we discuss possible directions for improving MPTCP for such scenarios. ​Website: http://www.thucsnet.org/hsrmptcp.html