Within the G-Lab NETCOMP project [1], we have developed Multi-Connection TCP (MCTCP) transport as a new multipath transport solution. MCTCP aggregates multiple Transmission Control Protocol (TCP) connections between potentially different addresses into a single session that can be accessed by an application like a single TCP connection. MCTCP encodes control information, as far as possible, in ...

TCP Vegas version is expected to achieve higher throughput than TCP Tahoe and Reno versions, which are currently used in the Internet. However, we need to consider a migration path of TCP Vegas when it is deployed in the Internet. In this paper, we focus on the situation where multiple TCP Reno and Vegas connections coexist at the bottleneck router, by which the fairness property is investigate...

Since its first introduction, TCP has been the major facility to transport best-effort traffic in the Internet. It has been enhanced repeatedly over 3 decades, and is now an integral part of every single computing facility. Today, Internet is again on the move toward more reliable and robust network services. In fact, fault tolerance and network security have become significant issues. To impro...

Everyone is concerned about the Internet security, yet most traffic is not cryptographically protected. The usual justification is that most attackers are only off-path and cannot intercept traffic; hence, challenge-response mechanisms suffice to ensure authenticity. Usually, the challenges re-use existing ‘unpredictable’ header fields to protect widely-deployed protocols such as TCP and DNS. W...

TCP is the most common and important transport layer protocol and its performance in the wireless environments is characterized by two path characteristics not normally present in wired environments: packet losses due to corruption and mobility.. In this research, we have used the perfect cellular model to model the wireless packet losses due to mobility and handoff in order to get the real per...

The use of wireless links causes several problems for TCP connections. Among them are high loss rates, high delay latency, high delay jitter, reverse path contention, dynamic link capacity, and link capacity dependent on transmission rate. These problems can be ameliorated through the use of modifications to TCP, with or without support from a router in the network. Solutions fall into two gene...

Long-hop TCP flows undergo throughput degradation when contending with short-hop TCP flows in a multi-hop wireless network due to collision related losses. Long hop flows compared to the short hop flows have to contend for the medium more number of times and hence suffer more number of collisions. In this paper, we propose a network coding scheme based on the timed network coding to improve the...

We demonstrate that the dynamic behavior of queue and average window is determined predominantly by the stability of TCP/RED, not by AIMD probing nor noise traffic. We develop a general multi-link multi-source model for TCP/RED and derive a local stability condition in the case of a single link with heterogeneous sources. We validate our model with simulations and illustrate the stability regio...