Transport Layer protocols supporting multipath transfer, i.e. to simultaneously utilise multiple Network Layer paths, are actively discussed in the IETF – particularly in the context of Multi-Path TCP (MPTCP) and Concurrent Multipath Transfer for SCTP (CMT-SCTP). Congestion control for such protocols is an important research topic. In this code contribution paper, we introduce our application m...

In this paper, we present preliminary results of measuring TCP data-path quality using a new measurement tool called OneProbe. Unlike the existing tools, OneProbe uses legitimate TCP data probes to profile TCP data-path quality by sampling round-trip delay, one-way loss rate, and one-way reordering rate at the same time. This paper presents a set of recent measurement studies on a set of web se...

The TCP congestion-control mechanism is an algorithm designed to probe the available bandwidth of the network path that TCP packets traverse. However, it is wellknown that the TCP congestion-control mechanism does not perform well on networks with a large bandwidth-delay product due to the slow dynamics in adapting its congestion window, especially for short-lived flows. One promising solution ...

A TCP trunk is an aggregate traffic stream whose data packets are transported at a rate dynamically determined by TCPÕs congestion control. Typically such a trunk is implemented on top of a layer-2 virtual circuit or an MPLS label switched path. A management TCP connection is used to regulate the rate at which the trunk transmits its data packets. Setting up a TCP trunk over a circuit or a path...

We present a new implementation of TCP that is better suited to today’s Internet than TCP Reno or Tahoe. Our implementation of TCP, which we call TCP Santa Cruz, is designed to work with path asymmetries, out-of-order packet delivery, and networks with lossy links, limited bandwidth and dynamic changes in delay. The new congestion-control and error-recovery mechanisms in TCP Santa Cruz are base...

The results of experiments with Multipath TCP (Multipath Transmission Control Protocol) in LTE (3GPP Long Term Evolution) networks are presented. Our results show increased resiliency and availability of network Multipath TCP connection. Using multiple sub-flows over diverse network paths inside Multipath TCP session results in greatly increased bandwidth and availability. When Multipath TCP is...

Vehicular Ad hoc Networks (VANET) exhibit highly dynamic behaviour with high mobility and random network topologies. The performance of Transmission Control Protocols (TCP) on such wireless ad hoc networks is plagued by a number of problems: link failures, scalability, multi-hop data transmission and data loss. In this work, we make use of the vehicle’s movement pattern, density, velocity and v...

Multipath TCP (MPTCP), which is based on TCP, transports data through multiple network interfaces at the same time. It is well known that MPTCP shows better throughput than legacy single path TCP. However, we argue that single path TCP may be better than MPTCP in terms of the flow completion time when delays of paths are significantly different. To avoid this problem, we propose an efficient pa...

We examine the validity of TCP-friendliness and the utility of equation-based congestion control as a mean for the media streaming service in 802.11 multi-hop networks. Our investigation is motivated by the recent findings of the bandwidth-delay product of 802.11 multi-hop networks via intensive computer simulations. We show that TCP behavior in 802.11 multi-hop networks is generally inefficien...

TCP is the main transport protocol over the Internet, ensuring reliable and efficient connections. TCP is trivially vulnerable to man-in-the-middle (MitM) attackers; they can intercept, modify and inject TCP traffic [Joncheray 1995]. Despite significant possible threats, a common assumption is that MitM capabilities are difficult to obtain; this assumption is demonstrated by OWASP’s list of top...