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SCTP: An innovative transport layer protocol for the web

SCTP: An innovative transport layer protocol for the web

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15th International Conference on World Wide Web, WWW'06

作者： Natarajan, Preethi Iyengar, Janardhan R. Amer, Paul. D. Stewart, Randall Protocol Engineering Lab CIS Dept University of Delaware United States Internet Technologies Division Cisco Systems

ISBN: (纸本)9781595933232

We propose using the Stream Control Transmission protocol (SCTP), a recent IETF transport layer protocol, for reliable web transport. Although TCP has traditionally been used, we argue that SCTP better matches the needs of HTTP-based network applications. This position paper discusses SCTP features that address: (i) head-of-line blocking within a single TCP connection, (ii) vulnerability to network failures, and (iii) vulnerability to denial-of-service SYN attacks. We discuss our experience in modifying the Apache server and the Firefox browser to benefit from SCTP, and demonstrate our HTTP over SCTP design via simple experiments. We also discuss the benefits of using SCTP in other web domains through two example scenarios - multiplexing user requests, and multiplexing resource access. Finally, we highlight several SCTP features that will be valuable to the design and implementation of current HTTP-based client-server applications.

关键词： HTTP

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Concurrent multipath transfer using transport layer multihoming: Performance under network failures

Concurrent multipath transfer using transport layer multihom...

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Military Communications Conference 2006, MILCOM 2006

作者： Natarajan, Preethi Iyengar, Janardhan R. Amer, Paul D. Stewart, Randall Protocol Engineering Lab CIS Dept University of Delaware United States Dept of Math and Computer Science Connecticut College United States Internet Technologies Division Cisco Systems

ISBN: (纸本)1424406188

Recent research on Concurrent Multipath Transfer using SCTP multihoming (CMT) proposed various retransmission policies to minimize the negative impacts of receiver buffer (rbuf) blocking that occur during congestion. Here we investigate CMT's throughput degradation caused by rbuf blocking during complete and/or short-term network failures. To improve CMT's performance during failure, we introduce a new state for each destination called the "Potentially Failed" (PF) state and propose a retransmission policy that takes the PF state into account. Using simulation, we evaluate our solution (called CMT-PF), and demonstrate its improved throughput over CMT in failure-prone networks such as FCS battlefield networks.

关键词： Military communications

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Receive buffer blocking in concurrent multipath transfer

Receive buffer blocking in concurrent multipath transfer

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GLOBECOM'05: IEEE Global Telecommunications Conference, 2005

作者： Iyengar, Janardhan R. Amer, Paul D. Stewart, Randall Protocol Engineering Lab. CIS Department University of Delaware Internet Technologies Division Cisco Systems

ISBN: (纸本)0780394143

Previously, we studied the performance of Concurrent Multipath Transfer using SCTP Multihoming (CMT) under the assumption of an infinite receive buffer (rbuf). Here, we study CMT performance when a sender is constrained by the rbuf. We demonstrate using simulation that if two paths are used for CMT, the lower quality (i.e., higher loss rate) path degrades overall throughput of an rbuf-constrained CMT association by blocking the rbuf. We demonstrate that a wise retransmission policy can alleviate some of the throughput degradation by reducing the rbuf blocking problem. We present and discuss CMT performance using several retransmission policies and constrained rbuf values of 16KB, 32KB, 64KB, 128KB, and 256KB. While rbuf blocking cannot be eliminated, it can be reduced by choice of retransmission policy - a facility available to only the transport layer. © 2005 IEEE.

关键词： Multipath propagation

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Receive buffer blocking in concurrent multipath transfer

Receive buffer blocking in concurrent multipath transfer

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： J.R. Iyengar P.D. Amer R. Stewart Protocol Engineering Lab CIS Department University of Delaware USA Internet Technologies Division Cisco Systems Inc. USA

Previously, we studied the performance of concurrent multipath transfer using SCTP multihoming (CMT) under the assumption of an infinite receive buffer (rbuf). Here, we study CMT performance when a sender is constrained by the rbuf. We demonstrate using simulation that if two paths are used for CMT, the lower quality (i.e., higher loss rate) path degrades overall throughput of an rbuf-constrained CMT association by blocking the rbuf. We demonstrate that a wise retransmission policy can alleviate some of the throughput degradation by reducing the rbuf blocking problem. We present and discuss CMT performance using several retransmission policies and constrained rbuf values of 16 KB, 32 KB, 64 KB, 128 KB, and 256 KB. While rbuf blocking cannot be eliminated, it can be reduced by choice of retransmission policy - a facility available to only the transport layer.

关键词： Throughput Degradation Network interfaces Fault tolerance Transport protocols Collaboration Government Computational Intelligence Society Internet Resilience

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Improving file transfers using SCTP multistreaming

Improving file transfers using SCTP multistreaming

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23rd IEEE International Performance, Computing, and Communications Conference, Conference Proceedings, IPCCC 2004

作者： Ladha, Sourabh Amer, Paul D. Protocol Engineering Lab CIS Department University of Delaware

We identify overheads associated with FTP, attributed to separate TCP connections for data and control, non-persistence of the data connections, and the sequential nature of command exchanges. We argue that solutions to avoid these overheads using TCP place an undue burden on the application. Instead we propose modifying FTP to use SCTP and its multistreaming service. FTP over SCTP avoids the identified overheads in the current FTP protocol without introducing complexity at the application, while still remaining "TCP-friendly". We implemented FTP over SCTP in three ways: (1) simply replacing TCP calls with SCTP calls, thus using one SCTP association for control and one SCTP association for each data transfer, (2) using a single multistreamed SCTP association for control and all data transfers, and (3) enhancing (2) with the addition of command pipelining. Our experiments compared these 3 variations with the classic FTP over TCP. Results indicate significant improvements in throughput for multiple file transfers with all three of our variations. The largest benefit occurs for (3) FTP over a single, pipelined, multistreamed SCTP association. More generally, this paper encourages the use of SCTP's innovative services to benefit existing and future application performance and presents the case for multistreaming.

关键词： Electric power transmission networks

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On the prevalence and evaluation of recent TCP enhancements

On the prevalence and evaluation of recent TCP enhancements

引用

GLOBECOM'04 - IEEE Global Telecommunications Conference

作者： Ladha, Sourabh Amer, Paul D. Caro Jr., Armando Iyengar, Janardhan R. Protocol Engineering Lab. Computer and Information Sciences University of Delaware

In recent years several enhancements to TCP congestion control and loss recovery mechanisms have been proposed and accepted as Internet standards. While each proposal has been accompanied with related research, a number of questions remain to be answered both in the research and the implementer community: (i) What is the current deployment status of these TCP enhancements in the Internet, (ii) What is the effect of TCP enhancements on web based transfers, and (iii) How do bulk data transfers benefit from the cumulative addition of these TCP enhancements. In this paper, we attempt to answer these questions. We consider five TCP enhancements: (1) Selective Acknowledgements (SACK) and the SACK-based loss recovery algorithm, (2) Increasing Initial Congestion Window, (3) Limited Transmit, (4) Appropriate Byte Counting, and (5) Early Retransmit. We present results from active measurements performed on web servers on the state of deployment of these enhancements. Our results show that while several web servers support TCP enhancements, the majority still use previous standards for congestion control and loss recovery. Using simulation, we quantify the cumulative effect of these TCP enhancements on web based and bulk data transfers. We hope that such an evaluation provides a clearer view of the applicability of these enhancements, and further motivation for their implementation. © 2004 IEEE.

关键词： Network protocols

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Concurrent multipath transfer using transport layer multihoming: Performance under varying bandwidth proportions

Concurrent multipath transfer using transport layer multihom...

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OtLCOM 2004 - 2004 IEEE Military Communications Conference

作者： Iyengar, Janardhan R. Amer, Paul D. Stewart, Randall Protocol Engineering Lab. Computer and Information Sciences University of Delaware Cisco Systems

We have previously specified three algorithms for the Stream Control Transmission protocol (SCTP) resulting in CMTscd - a protocol that uses SCTP's multihoming feature for correctly transferring data between multihomed end hosts using multiple separate end-to-end paths. In this paper, we evaluate CMTscd against AppStripe (Application-Striping) under uniform losses varying from 0 to 10 percent. We also present results encouraging the use of multiple paths in lossy networks such as battlefield networks. In this work, we operate under the strong assumptions that the receiver's advertised window does not constrain the sender, and that the bottleneck queues on the end-to-end paths used in CMT are independent of each other. © 2004 IEEE.

关键词： Network protocols

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Retransmission policies for concurrent multipath transfer using SCTP multihoming

Retransmission policies for concurrent multipath transfer us...

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2004 12th IEEE International Conference on Networks, ICON 2004 - Unity in Diversity

作者： Iyengar, Janardhan R. Amer, Paul D. Stewart, Randall Protocol Engineering Lab. CIS Dept. University of Delaware United States Transport Technologies Cisco Systems Netherlands

ISBN: (纸本)078038783X

Concurrent Multipath Transfer (CMT) uses the Stream Control Transmission protocol's (SCTP's) multihoming feature to distribute data across multiple end-to-end paths in a multihomed SCTP association. We propose five retransmission policies for CMT. We demonstrate the occurrence of spurious retransmissions in CMT with all of the five policies, and propose an amendment to the timeout retransmission mechanism to avoid spurious retransmissions. We also modify the Cwnd Update for CMT (CUC) algorithm to allow better cwnd growth in CMT with the different retransmission policies. We then evaluate the retransmission policies using ns-2 simulations, and discuss the distributions of traffic that result We operate under the strong assumptions that the receiver's advertised window does not constrain the sender, and that the bottleneck queues on the end-to-end paths used in CMT are independent. © 2004 IEEE.

关键词： Network protocols

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Retransmission schemes for end-to-end failover with transport layer multihoming

Retransmission schemes for end-to-end failover with transpor...

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GLOBECOM'04 - IEEE Global Telecommunications Conference

作者： Caro Jr., Armand O L. Amer, Paul D. Stewart, Randall R. Protocol Engineering Lab Computer and Information Sciences University of Delaware Transport Technologies Internet Technologies Division Cisco Systems Inc.

We previously evaluated five retransmission schemes in non-failure scenarios for transport protocols that support multihoming. In this paper, we introduce five additional retransmission schemes, and evaluate all ten schemes under both non-failure and failure scenarios. We show that the best retransmission policy dictates that (a) new data transmissions and fast retransmissions should be sent to the same peer IP address, and (b) timeout retransmissions should be sent to an alternate peer IP address. This policy performs best if combined with our Multiple Fast Retransmit algorithm. © 2004 IEEE.

关键词： Data communication systems

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End-to-end failover thresholds for transport layer multihoming

End-to-end failover thresholds for transport layer multihomi...

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OtLCOM 2004 - 2004 IEEE Military Communications Conference

作者： Caro Jr., Armando L. Amer, Paul D. Stewart, Randall R. Protocol Engineering Lab. Computer and Information Sciences University of Delaware Transport Technologies Internet Technologies Division Cisco Systems Inc.

SCTP's multihoming failure detection time depends on three tunable parameters: *** (minimum retransmission timeout), *** (maximum retransmission timeout), and *** (threshold number of consecutive timeouts that must be exceeded to detect failure). RFC2960 recommends *** = 5, which translates to a failure detection time of at least 63 seconds - unacceptable to many applications. This research investigates the tradeoff between a more aggressive (i.e., lower) threshold, and spurious failovers for the application of bulk file transfer. We surprisingly find that spurious failovers do not degrade overall performance, and sometimes actually improve goodput performance. © 2004 IEEE.

关键词： Military communications

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