Research paper on computer programming

Publicado em Agosto 2017

This issue contains three technical contributions and two editorials. However, the existing Internet architecture is seriously challenged to ensure universal service provisioning at economically sustainable price points, largely due to the costs associated with providing services in a perceived always-on manner. Poptrie outperforms the state-of-the-art technologies, Tree BitMap, DXR and SAIL, in all of the evaluations using random and real destination queries on 35 routing tables, including the real global tier-1 ISP's full-route routing table. This is the basic level and we expect that all CCR papers are repeatable. The third editorial is looking at an alternative information centric architecture for the Internet, while the last one presents a really nice exposition of how people think about network neutrality in different countries, and possible ways that one could use to get their head around the topic. In this position paper, we take the first steps towards making this vision concrete by identifying a few such interfaces that are both simple-to-support and safe-to-deploy (for the carrier) while being flexibly useful (for third-parties). We argue that this in-band approach is attractive as it keeps the failure scope local and does not require additional out-of-band coordination mechanisms. We also found that the geographic location of IP blocks has continuously changed but has been stable. , that integrates the tradeoffs associated with speculation into job scheduling decisions. Interestingly, by using part of the data plane configuration space as a shared memory and leveraging the match-action paradigm, we can implement our synchronization framework in today’s standard OpenFlow protocol, and we report on our proof-ofconcept implementation. I found SIGCOMM to be a stimulating, vibrant venue with ever increasing reach. I agree with the editors of this series that technology transfer from academia occurs in a variety of ways with different tradeoffs. Some of these works have been presented at ACM Sigcomm, always attracting attention and follow up work. We refer to this vision of human-centered edge-device based computing as Edge-centric Computing. Phillipa Gill, from Stonybrook University, and Prof. These artifacts contain additional material related to the article such as datasets, proofs for some theorems, multimedia sequences, software (source code or binaries), … These artifacts are important to ease the replication and the reproduction of our published research results. This last issue of 2015 features five papers, out of which four are technical contributions and one is an editorial. However, new flexible hardware is on the horizon that will provide customizable packet processing pipelines needed to implement Paxos. The Paxos protocol is the foundation for building many fault-tolerant distributed systems and services. In this work, we report upon the network traffic observed in some of Facebook's datacenters. We demonstrate how the framework encompasses existing models and measurements, and we apply it in a simple case study to illustrate the value. Silo builds upon network calculus to place tenant VMs with competing requirements such that they can coexist. The Domain Name System Security Extensions (DNSSEC) add authenticity and integrity to the DNS, improving its security. The virtualization and softwarization of modern computer networks offers new opportunities for the simplified management and flexible placement of middleboxes as e. I hope you do enjoy all the articles. Backscatter provides dual-benefits of energy harvesting and low-power communication, making it attractive to a broad class of wireless sensors. Their feedback is often very detailed and it clearly contributes to the quality of the papers that you read. Some papers already include links to author's web pages for some of these artifacts. My deepest gratitude to all the authors of editorial submissions. As those used for the paper. C. We address these questions in three steps: (1) modeling the cloud provider's setting of the spot price and matching the model to historically offered prices, (2) deriving optimal bidding strategies for different job requirements and interruption overheads, and (3) adapting these strategies to MapReduce jobs with master and slave nodes having different interruption overheads. Jin, Abdul Kabbani, Michalis Kallitsis, Naga Katta, Ethan Katz-Bassett, Eric Keller, Manjur Kolhar, Balachander Krishnamurthy, Kun Tan, Mirja Kuhlewind, Anh Le, Jungwoo Lee, Zhenhua Liu, Matthew Luckie, Sajjad Ahmad Madani, Olaf Maennel, John Maheswaran, Petri Mahonen, Saverio Mascolo, Deepak Merugu, Jelena Mirkovic, Vishal Misra, Radhika Mittal, Tal Mizrahi, Amitav Mukherjee, Dragos Niculescu, Nick Nikiforakis, Dave Oran, Chiara Orsini, Patrick P. Additionally, key management policies are often complex. We also show that Condor supports the daunting task of designing multi-phase network expansions that can be carried out on live networks. A key challenge we address is linking IXP identifiers across databases maintained by different organizations. In August, we held our most successful ever “best of CCR session” that saw tremendous attendance but also very positive feedback. Traffic matrices naturally possess complex spatiotemporal characteristics, but their proprietary nature means that little data about them is available publicly, and this situation is unlikely to change. Implementing Paxos provides a critical use case for P4, and will help drive the requirements for data plane languages in general. Moreover, the limited large-scale workload information available in the literature has, for better or worse, heretofore largely been provided by a single datacenter operator whose use cases may not be widespread. I have attended the SIGCOMM executive committee meetings and realized the tremendous amount of work that happens behind the scenes and that underlies the success of each one of our conferences. The challenge, however, lies in decoding concurrent streams at the reader, which we achieve using a novel combination of time-domain separation of interleaved signal edges, and phase-domain separation of colliding transmissions. While Facebook operates a number of traditional datacenter services like Hadoop, its core Web service and supporting cache infrastructure exhibit a number of behaviors that contrast with those reported in the literature. We report on the contrasting locality, stability, and predictability of network traffic in Facebook's datacenters, and comment on their implications for network architecture, traffic engineering, and switch design. Dear students: I hope you have been enjoying reading the column. Traffic matrices describe the volume of traffic between a set of sources and destinations within a network. Technological advances such as powerful dedicated connection boxes deployed in most homes, high capacity mobile end-user devices and powerful wireless networks, along with growing user concerns about trust, privacy, and autonomy requires taking the control of research paper on computer programming computing applications, data, and services away from some central nodes (the “core”) to the other logical extreme (the “edge”) of the Internet. Akella, from University of Wisconsin. Network architects must trade off many criteria to design costeffective, reliable, and maintainable networks, and typically cannot explore much of the design space. I am very proud to have had the opportunity to be part of that team and to have affected some of the changes in our conferences' practices. An inexpensive approach for IP routing table lookup is required against diverstiy essay ever growing size of the Internet. During the last few years, the number and size of IXPs have increased rapidly, driving the flattening and shortening of Internet paths. Link-flooding attacks have the potential to disconnect even entire countries from the Internet. These past three years have also given me a completely new perspective on what it takes to run a professional society based on volunteers. As a community, we do not frequently encourage the reproduction of previous articles since we usually focus on original results. I am very excited about what CCR has achieved so far and thank all the authors for their interest in CCR. I left London with lots of new ideas, and a sense that our community research paper on computer programming has the potential to make a true difference in the world. It starts with the editorial board but it does not end there. This means DNSSEC is more susceptible to packet fragmentation and makes DNSSEC an attractive vector to abuse in amplificationbased denial-of-service attacks. In this paper, we propose an IP geolocation DB creation method based on a crowd-sourcing Internet broadband performance measurement tagged with locations and present an IP geolocation DB based on 7 years of Internet broadband performance data in Korea. G. An article is considered to be replicable if a different team than the authors of the paper can obtain the same results as those stated in the paper by using the same division administrator resume software, datasets, etc. Everflow traces specific packets by implementing a powerful packet filter on top of "match and mirror" functionality of commodity switches. IXP participants, geographical coverage, and co-location facilities. In particular, we consider the number of used middleboxes and highlight the benefits of the approximation algorithm in incremental deployments. In addition to storing pdf versions of the articles and the associated metadata, it is now possible to associate artifacts to each published article. Dr. This security task has become challenging due to the complexity of the modern web, of the data delivering technology, and even to the adoption of encryption, which, while improving privacy, makes innetwork services ineffective. All the committee members continuously think how to improve the benefits to our community's members and make our conferences exciting, informative, and fun venues where not only collaborations but also friendships form for life. This paper shows the suitability of Poptrie in the future Internet including IPv6, where a larger route table is expected with longer prefixes. Internet eXchange Points (IXPs) are core components of the Internet infrastructure where Internet Service Providers (ISPs) meet and exchange traffic. Aalo's performance is comparable to that of solutions using prior knowledge, and Aalo outperforms them in presence of cluster dynamics. This column is similar to the previous one: it attempts to address a few more of your questions. The questions below don’t provide comprehensive coverage of either topic; as such, we may revisit them in future editions. In this work, we do the first cross-comparison of three well-known publicly available IXP databases, namely of PeeringDB, Euro-IX, and PCH. We demonstrate how ReWiFlow can be used to implement applications such as dynamic proactive routing. "Net neutrality" and Internet "fast-lanes" have been the subject of raging debates for several years now, with various viewpoints put forth by stakeholders (Internet Service Providers, Content Service Providers, and consumers) seeking to influence how the Internet is regulated. Welcome to the last CCR issue for the year 2015. For an experimental paper, this implies that the software used for the experiment produces the same results multiple times. Traffic Engineering (TE) is the network’s natural way of mitigating link overload events, balancing the load and restoring connectivity. R. Initial flow setup delay, can overcome the benefits, for example when we have many time-sensitive short flows. Control planes of forthcoming Software-Defined Networks (SDNs) will be distributed : to ensure availability and faulttolerance, to improve load-balancing, and to reduce overheads, modules of the control plane should be physically distributed. However, it is a very important step in the validation of new scientific results. Datix is a system that deals with an important problem in the intersection of data management and network monitoring while utilizing state-of-the-art distributed processing engines. These matrices are used in a variety of tasks in network essay on earthquake planning and traffic engineering, such as the design of network topologies. This classification provides a precise definition for three words: Repeatability, Replicability and Reproducibility that could be considered as synonyms by nonnative English speakers like me. We outline the architecture and design of Datix and we present the evaluation of Datix using real traces from an operational IXP. We show that these are highly attractive for use in DNSSEC, although they also have disadvantages. I encourage you to read this editorial and then take some time to think about your ongoing work and the impact that it could have on values such as human The ACM publications board has recently discussed this problem and came up with an interesting classification that applies to experimental papers. As you can see from this list, producing CCR relies on the efforts of a large number of members of our community. The first level is Repeatability. In this work, we present Hopper, a job scheduler that is speculationaware, i. We identify three key requirements for such predictability: guaranteed network bandwidth, guaranteed packet delay and guaranteed burst allowance. , tasks that take significantly longer than expected to run. Networks are the cornerstone of day to day discovery, and are an indispensable component of our societies. Our first contribution is to highlight the contentions in the net neutrality debate from the viewpoints of technology (what mechanisms do or do not violate net neutrality? Condor then uses constraint-based synthesis to rapidly generate candidate topologies, which can be analyzed against multiple criteria. Enabling universal Internet access has been recognized as a key issue to enabling sustained economic prosperity, evidenced by the myriad of initiatives in this space. In fact, to realize their full potential for both supporting innovation and generating revenue, we should think of carrier networks as servicedelivery platforms. Silo does not require any changes to applications, guest OSes or network switches. I wanted to thank with all my heart all the associate editors I have had the pleasure to work with during the past 3 years. The algorithm is based on optimizing over a submodular function which can be computed efficiently using a fast augmenting path approach. I got to read articles that I would probably not have read otherwise, and get excited by the increasing number of opportunities that computing and computer networks put at our disposal every day. We also position that this development can help blurring the boundary between man and machine, and embrace social computing research paper on computer programming in which humans are part of the computation and decision making loop, resulting in a human-centered system design. 93x faster on average and 3. Computing users' bidding strategies is particularly challenging: higher bid prices reduce the probability of, and thus extra time to recover from, interruptions, but may increase users' cost. 3 % more IXP participants than the commonly-used PeeringDB. I am delighted they will lend us their expertise for the next 2 years. We present Condor, our approach to enabling a rapid, efficient design cycle. The overheads of this fine-grained control, e. I hope that future CCR issues will contain such papers. Lee, Christos Papadopoulos, Dimitris Papadopoulos, Craig Partridge, Peter Peresini, Ben Pfaff, Guillaume Pierre, David Plonka, Ingmar Poese, Lucian Popa, Ihsan Qazi, Zafar Qazi, Feng Qian, Costin Raiciu, Bhaskaran Raman, Fernando Ramos, Ashwin Rao, Ravishankar Ravindran, Mark Reitblatt, James Roberts, Franziska Roesner, Dario Rossi, Michele Rossi, Mario Sanchez, Stuart Schechter, Fabian Schneider, Julius Schulz-Zander, Sayandeep Sen, Soumya Sen, Zubair Shafiq, Craig Shue, Georgos Siganos, Georgios Smaragdakis, Joel Sommers, Alex Sprintson, Stephen Strowes, Srikanth Sundaresan, Muhammad Talha Naeem Qureshi, Vamsi Talla, Boon Thau Loo, Brian Trammel, Martino Trevisan, Narseo Vallina-Rodriguez, Roland van Rijswijk-Deij, Matteo Varvello, Aravindan Vijayaraghavan, Stefano Vissicchio, Ashish Vulimiri, Mythili Vutukuru, Nick Weaver, Michael Welzl, James Westall, Erik Wilde, Walter Willinger, Craig Wills, Rolf Winter, Bernard Wong, Wenfei Wu, Matthias Wählisch, Di Xie, Teck Yoong Chai, Yan Zhang and Haitao Zhao. Our goal is to develop techniques to synthesize traffic matrices for researchers who wish to test new network applications or protocols. However, speculation mechanisms are designed and operated independently of job scheduling when, in fact, scheduling a speculative copy of a task has a direct impact on the resources available for other jobs. Inter-coflow scheduling improves application-level communication performance in data-parallel clusters. But the design of a protocol that enables extremely power-efficient radios for harvesting-based sensors as well as high-rate data transfer for data-rich sensors presents a conundrum. Computers have a huge impact on our life, and computer programs tell those computers what to do and how to do it. We elaborate in this position paper on research paper on computer programming this vision and present the research challenges associated with its implementation. In particular, many thanks to Kyle Jamieson (Princeton), Ethan Katz-Bassett (USC), George Porter (UCSD), Vyas Sekar (CMU), and Minlan Yu (USC) for contributing answers. Our final contribution is to propose a new model that engages consumers in fast-lane negotiations, allowing them to customize fast-lane usage on their broadband link. , in the context of incremental deployment of software-defined networks. We also present a generalization of ReWiFlow, called MultiReWiFlow, and show how it can be used to efficiently represent access control rules collected from Stanford’s backbone network. We implement defense prototypes using simulation mechanisms and evaluate them extensively on multiple real topologies. Named after our approach to traversing the tree, it leverages the population count instruction on bit-vector indices for the descendant nodes to compress the data structure within the CPU cache. I got plenty of help in preparing this edition. I would like to thank him for all the efforts he put in handling CCR papers and I welcome Prof. David Choffnes, Northeastern University. Preliminary results obtained executing a prototype implementation demonstrate the feasibility and potential of CROWDSURF. This model enables fully flexible node designs, from extraordinarily powerefficient backscatter radios that consume barely a few micro-watts to high-throughput radios that can stream at hundreds of Kbps while consuming a paltry tens of micro-watts. This requires providing open interfaces that allow third-parties to leverage carrier-network infrastructures in building global-scale services. A measurement described in an article is considered to be repeatable if the same write an argumentative essay team can obtain the same results with the same setup in multiple trials. As a side-product of our linkage heuristics, we make publicly available the union of the three databases, which includes 40. Let’s keep it up! In the long term, we imagine that consensus could someday be offered as a network service, just as point-to-point communication is provided today. However, existing efficient schedulers require a priori coflow information and ignore cluster dynamics like pipelining, task failures, and speculative executions, which limit their applicability. The result is the creation of “suggestions” that individuals can transform in enforceable “rules” to customize their web browsing policy. Our technical papers cover open networking and SDN, middleboxes, IXPs and ways to create an IP geolocation database. We show how the principle of maximum entropy can be used to generate a wide variety of traffic matrices constrained by the needs of a particular task, and the available information, but otherwise avoiding hidden assumptions about the data. To address these, we have initiated research that aims to investigate the viability of deploying ECC at a large scale in DNSSEC. The first editorial, “Global Measurements: Practice and Experience (Report on Dagstuhl Seminar #16012)” summarizes the lessons learned from a recent workshop on global Internet measurements. Although our IP geolocation DB is limited to Korea, the 32 million broadband performance test records over 7 years provide wide coverage as well as finegrained accuracy. Many cloud applications can benefit from guaranteed latency for their network messages, however providing such predictability is hard, especially in multi-tenant datacenters. firewalls and proxies. For both good and bad, computer programs have altered our existence, so it's about time you learned a little something about them. Dear students: This edition of the Student Mentoring Column focuses on program committees (their composition and how they work) and the importance of social networking at conferences. We present a deterministic O(log(min{n, κ})) approximation algorithm for n-node computer networks, where κ is the middlebox capacity. Not only because they allowed me to experience the energy behind a newsletter like CCR, but also because I was given the opportunity to interact with a much broader part of our community. It reminds us that when we decide to carry out research on a given topic, our research results may have a broader impact than simply a series of papers published in conference proceedings, journals or online libraries. We have had quite an intensive year. CCR heavily depends on reviewers who agree to spend time to comment submitted papers. Dina Papagiannaki CCR Editor Individuals lack proper means to supervise the services they contact and the information they exchange when surfing the web. I am also very pleased with the introduction of the ILB column and the student mentoring column, which I believe have given freshness to CCR. E. Silo leverages the tight coupling between bandwidth and delay: controlling tenant bandwidth leads to deterministic bounds on network queuing delay. Without the work of all these volunteers CCR would not be the same. In brief, Datix manages to efficiently answer queries within minutes compared to more than 24 hours processing when executing existing Pythonbased code in single node setups. G. By performing prioritization across queues and by scheduling coflows in the FIFO order within each queue, Aalo's non-clairvoyant scheduler reduces coflow completion times while guaranteeing starvation freedom. Large cloud service providers have invested in increasingly larger datacenters to house the computing infrastructure required to support their services. Unfortunately, most of the current network analysis approaches are ad-hoc and centralized, and thus not scalable. Joel Sommers, from Colgate University, are ending their tenure at CCR. ). Thanks for the great questions; keep them coming! Fahad Dogar, TUMS University, and Prof. We confirm that the low accuracy of commercial IP geolocation DBs mainly results from selecting a single representative location for a large IP block from the Whois registry DB, parsing city names in a naive way, and resolving the wrong geolocation coordinates. Jobs with lower bids (including those already running) are interrupted and must wait for a lower spot price before resuming. I find his “lessons learnt” a useful guideline to consider before embarking in such a journey. A novel hypervisor-based policing mechanism achieves packet pacing at sub-microsecond granularity, ensuring tenants do not exceed their allowances. Unfortunately, DNSSEC is not without problems. With this, it was a great pleasure to see some of you in London. The ACM Digital Library provides a permanent storage for all the papers published in CCR and our conferences. Finally, this issue sees the end of term for two of our associate editors. In this paper, we propose research paper on computer programming a synchronization framework for control planes based on atomic transactions, implemented in-band, on the data-plane switches. The technical papers cover topics such as secure DNS, OpenFlow, network analytics, and transparency in the Web. Position papers made me think "why not" and "what if". An article is considered to be reproducible if an independent group can implement the solution described in a paper and obtain similar results as those described in the paper without using the paper's artifacts. We implement both centralized and decentralized prototypes of the Hopper scheduler and show that 50% (66%) improvements over state-of-the-art centralized (decentralized) dissertation defense outline schedulers and speculation strategies can be achieved through the coordination of scheduling and speculation. C. I have seen papers mature through the revise-and-resubmission process, and submissions addressing important problems through clear, practical solutions. Until recently, the notion of a switchbased implementation of Paxos would be a daydream. Accordingly, researchers and industry practitioners alike have focused a great deal of effort designing network fabrics to efficiently interconnect and manage the traffic within these datacenters in performant yet efficient fashions. I will miss our monthly interactions Keshav, Renata, Jorg, Hamed, Yashar, Olivier, Bruce, and Bruce. “Paxos Made Switch-y” proposes an implementation of the Paxos distributed consensus protocol in P4. In this paper, we present a new fully asymmetric backscatter communication protocol where nodes blindly transmit data as and when they sense. I believe that we could also learn a lot from articles that write executive summary master thesis reproduce important results. He uses 3 different examples and clearly demonstrates that there is no “one size fits all” approach to technology transfer. The third level is Reproducibility. Poptrie peaks between 174 and over 240 Million lookups per second (Mlps) with a single core and tables with 500- 800k routes, consistently 4-578% faster than all competing algorithms in all the tests we ran. We present Everflow, a packet-level network telemetry system for large DCNs. EC2 deployments and trace-driven simulations show that communication stages complete 1. Throughout the entire year of 2015 we received 105 submissions and published 19 papers (both technical and editorial). This work poses the question: Do we need a new kind of TE to expose an attack as well? Varghese discusses his experience in moving academic knowledge to commercial products. A crucial roadblock to achieving predictable performance is stragglers, i. Amazon sets the spot price dynamically and accepts user bids above this price. I would like to thank them both for having produced some of the most thought provoking public reviews and for always having provided considerate, constructive feedback in research paper about english language all the papers they had to deal with in the past 2 years. While preparing this editorial, I research paper on computer programming checked the submission site and found that last year 150 members of our community agreed to review one or more papers for CCR: Cedric Adjih, Mohamed Ahmed, Mark Allman, Luigi Atzori, Brice Augustuin, Ihsan Ayyub Qazi, Jingwen Bai, Aruna Balasubramanian, Nicola Baldo, Sujata Banerjee, Theophilus Benson, Robert Beverly, Nevil Brownlee, Ed Bugnion, Giovanna Carofiglio, Antonio Carzaniga, Pedro Casas, Kai Chen, Chih-Chuan Cheng, David Choffnes, Antonio Cianfrani, Jon Crowcroft, Italo Cunha, Alberto Dainotti, Lara Deek, Shuo Deng, Luca Deri, Xenofontas Dimitropoulos, Ning Ding, Yongsheng Ding, Nandita Dukkipati, Alessandro Finamore, Davide Frey, Timur Friedman, Xinwen Fu, Erol Gelenbe, Aaron Gember-Jacobson, Minas Gjoka, Lukasz Golab, Andrea Goldsmith, Sergey Gorbunov, Tim Griffin, Arjun Guha, Saikat Guha, Deniz Gunduz, Chuanxiong Guo, Berk Gurakan, Gonna Gursun, Hamed Haddadi, Emir Halepovic, Sangjin Han, David Hay, Oliver Hohlfeld, essay writing services forum Shengchun Huang, Asim Jamshed, R. We show that Silo can ensure predictable message latency for cloud applications while imposing low overhead. However, understanding the present status of the IXP ecosystem and its potential role in shaping the future Internet requires rigorous data about IXPs, their presence, status, participants, etc. I am glad that our community continues to innovate and broadening its reach to encompass wired, and wireless networks, social networks, virtual infrastructures, data centers, while thinking about specific use cases of the underlying capabilities. The committee has been further working on a number of projects to encourage participation from under-represented areas, create and archive educational material, encourage good research practices, etc. Coarse-grained control of groups of flows, on the other hand, can be very complex: each packet may match multiple rules, which requires conflict resolution. Amazon's Elastic Compute Cloud (EC2) uses auction based spot pricing to sell spare capacity, allowing users to bid for cloud resources at a highly reduced rate. In this paper, we present Datix, a fully decentralized, open-source analytics system for network traffic data that relies on smart partitioning storage schemes to support fast join algorithms and efficient execution of filtering queries. Similarly to crowdsourced efforts, we enable users to contribute in building awareness, supported by the semi-automatic analysis of data offered by a cloud-based system. The past three years have been a true learning experience for me. Aalo employs Discretized Coflow-Aware Least-Attained Service (D-CLAS) to separate coflows into a small number of priority queues based on how much they have already sent across the cluster. G. Dr. Starting with this issue of CCR, the authors of accepted papers will be encouraged to provide artifacts that will be linked to the paper in the ACM Digital Library. While this new hardware is still not readily available, several vendors and consortia have made the programming languages that target these devices public. We also publish our analysis code to foster reproducibility of our experiments and shed preliminary insights into the accuracy of the union dataset. We run our strategies on EC2 for a variety of job sizes and instance types, showing that spot pricing reduces user cost by 90% with a modest increase in completion time compared to on-demand pricing. We provide the comprehensive performance evaluation, remarkably with the CPU cycle analysis. 2 % more IXPs and 66. Our industrial liaison board column features Dr. The meeting provided a platform for the attendees from 49 institutions across 13 countries to exchange their recent NDN research and development results, to debate existing and proposed functionality in NDN forwarding, routing, and security, and to provide feedback to the NDN architecture design evolution. The editorial presents a position around what the authors call edge-centric computing. The design space for large, multipath datacenter networks is large and complex, and no one design fits all purposes. The ever-increasing Internet traffic poses challenges to network operators and administrators that have to analyze large network datasets in a timely manner to make decisions regarding network routing, dimensioning, accountability and security. Tens of reviewers are involved in the review process of CCR every quarter. The derived approximation bound is optimal: the underlying problem is computationally hard to approximate within sublogarithmic factors, unless P = NP holds. The workshop reports take so much work but made me feel I was attending venues thousands of miles away. Network datasets collected at large networks such as Internet Service Providers (ISPs) or Internet Exchange Points (IXPs) can be in the order of Terabytes per hour. Debugging faults in complex networks often requires capturing and analyzing traffic at the packet level. They both join with tremendous energy. As I have said in previous issues, CCR would not be possible without the work of a very large number of volunteers. Our farewell to Joel and Phillipa comes with our welcome to two new associate editors. We additionally present an exact algorithm based on integer programming, and complement our formal analysis with simulations. We position that a new shift is necessary. However, these links are rarely permanent and they often disappear after a few months or years. Internet of Things leads to routing table explosion. Reproducing an experimental paper is not a simple job since it often requires an engineering effort to implement the software used for all experiments. In this paper, we argue that the choice for RSA as default cryptosystem in DNSSEC is a major factor in these three problems. The second level is Replicability. The executive committee meetings happen monthly and I have never seen an agenda with less than 5-10 items. With the research paper on computer programming increasing prevalence of middleboxes, networks today are capable of doing far more than merely delivering packets. Compared with other commercial IP geolocation DBs, our crowd-sourcing IP geolocation DB shows increased accuracy with fine-grained granularity. I have to commend all the authors of editorial submissions. This paper describes an implementation of Paxos in one of those languages, P4. At this point, speculative execution has been widely adopted to mitigate the impact of stragglers. This paper posits that there are significant performance benefits to be gained by implementing Paxos logic in network devices. We show that TDL supports concise descriptions of topologies such as fat-trees, BCube, and DCell; that we can generate known and novel variants of fat-trees with simple changes to a TDL file; and that we can synthesize large topologies in tens of seconds. The paucity of available data, and the desire to build a general framework for synthesis that could work in various settings requires a new look at this problem. As clusters continue to grow in size and complexity, providing scalable and predictable performance is an increasingly important challenge. It is my great pleasure to welcome to the CCR editorial board Prof. Maybe one of the most surprising elements of my tenure is how much I enjoyed reading the editorial submissions. George Varghese. I really liked seeing the many different views on network neutrality as instantiated across different countries. CROWDSURF provides the core infrastructure to let individuals and enterprises regain visibility and control on their web activity. Our approach also finds interesting applications, e. With that, I invite you to read the current issue. Particularly, we are interested in the initial as well as the incremental deployment of middleboxes. However, in order to guarantee consistency of network operation, actions performed on the data plane by different controllers may need to be synchronized, which is a nontrivial task. This report is a brief summary of the second NDN Community Meeting held at UCLA in Los Angeles, California on September 28–29, 2015. To troubleshoot faults in a timely manner, DCN administrators must a) identify affected packets inside large volume of traffic; b) track them across multiple network components; c) analyze traffic traces for fault patterns; and d) test or confirm potential causes. The questions below don't provide comprehensive coverage of either topic; as such, we may revisit them in future editions. In this paper, we present ReWiFlow, a restricted class of OpenFlow wildcard rules (the fundamental way to control groups of flows in OpenFlow), which allows managing groups of flows with flexibility and without loss of performance. Prof. Computing exhibits the same phenomenon; we have gone from mainframes to PCs and local networks in the past, and over the last decade we have seen a centralization and consolidation of services and applications in data centers and clouds. Special thanks to Prof. Moreover, newly proposed indirect link-flooding attacks, such as “Crossfire”, are extremely hard to expose and, subsequently, mitigate effectively. Our second contribution is to survey the state-of-play of net neutrality in various regions of the world, highlighting the influence of factors such as consumer choice and public investment on the regulatory approach taken by governments. Alternative cryptosystems, based on elliptic curve cryptography (ECDSA and EdDSA), exist but are rarely used in DNSSEC. We find different AS-centric versus IXP-centric views provided by the databases as a result of their data collection approaches. In this paper we summarize the perspectives on this debate from multiple angles, and propose a fresh direction to address the current stalemate. Again, many thanks to Brighten Godfrey (UIUC) and Vyas Sekar (CMU) for contributing their thoughts. The key idea is that a carefully crafted, attack-aware TE could force the attacker to follow improbable traffic patterns, revealing his target and his identity over time. ), and society (do fast-lanes disempower consumers? Our Associate Editors selected these reviewers. Dear students: This edition of the Student Mentoring Column focuses on various testbeds (for wired networking researching) and datasets. In addition, we highlight differences and similarities w. I describe, to the best of my recollection, some of my experiences with ideas that originated or were described in academic papers, from Deficit Round Robin to Conga. E. In this task, datacenter networks (DCNs) present unique challenges with their scale, traffic volume, and diversity of faults. We believe that our approach can provide a compromise solution that can break the current stalemate and be acceptable to all parties. Taking time out of busy schedules to put one's thoughts in paper is a task that is not to be underestimated. We also offer some insight into ongoing work to realize our vision in a concrete test bed and trial setting. We present experiments that demonstrate Everflow's scalability, and share experiences of troubleshooting network faults gathered from running it for over 6 months in Microsoft's DCNs. “On the Interplay of Link-Flooding Attacks and Traffic Engineering” discusses a specific type of denial of service attack where an attacker tries to disconnect some targets by overloading key links in their target’s neighborhood. Networking research is highly selective and I feel that our community could certainly use a little more recognition in their day to day. Condor allows architects to express their requirements as constraints via a Topology Description Language (TDL), rather than having to directly specify network structures. The ability to manage individual flows is a major benefit of Software-Defined Networking. Through my participation to those meetings I have come to respect and admire (even more than before) the members of the executive committee for their dedication and unconditional service. Augustin Chaintreau that is ending his tenure at CCR with this issue. To empower transparency and the capability of taking informed choices in the web, we propose CROWDSURF, a system for comprehensive and collaborative auditing of data exchanged with Internet services. We present Silo, a system that offers these guarantees in multi-tenant datacenters. Finally, thanks to all the authors of technical submissions that continuously advance the state of the art in computer networking. ), economics (how does net neutrality help or hurt investment and growth? In this paper, we provide an outlook on the main concepts underlying our universal architecture and the opportunities arising from it. To our knowledge, no tool today can achieve both the specificity and scale required for this task. The decoupling in space and time, achieved through these underlying paradigms, is key to aggressively widen the connectivity options and provide flexible service models beyond what is currently pursued in the game around universal service provisioning. This makes DNSSEC fragile and leads to operational failures. The second editorial, “Towards Considering Relationships between Values and Networks” looks at the interactions between human rights and the technology that we resume writing services in usa develop. Spot pricing thus raises two basic questions: how might the provider set the price, and what prices should users bid? In this paper, we present Aalo that strikes a balance and efficiently schedules coflows without prior knowledge. We have implemented a Silo prototype comprising a VM placement manager and a Windows filter driver. Datix also achieves nearly 70% speedup compared to baseline query implementations of popular big data analytics engines such as Hive and Shark. We provide an implementation of our protocol, LF-Backscatter, and show that it can achieve an order of magnitude or more improvement in throughput, latency and power over state-of-art alternatives. They usually serve for a period of three years. I would greatly encourage all PhD students to go through the executive committee meeting notes that are publicly available online. Schedulers without prior knowledge compromise on performance to avoid head-of-line blocking. T. My deepest thanks to the Industrial Liaison Board and Prof. We contribute by a fast and scalable software routing lookup algorithm based on a multiway trie, called Poptrie. It allows us to realize fundamental consensus primitives in the presence of controller failures, and we discuss their applications for consistent policy composition and fault-tolerant control-planes. This paper initiates the study of algorithmically exploiting the flexibilities present in virtualized and software-defined networks. It features four editorials, two of which present the reports for the 7th Workshop on Active Internet Measurements (AIMS-7), and the 2nd Named Data Networking Community meeting (NDNcomm). I am particularly excited that our award committees are now publicly released, offering increased transparency around our most cherished processes that acknowledge outstanding scientific contributions. We show that both existing and novel TE modules can efficiently expose the attack, and study the benefits of each approach. I also hope to talk about wireless testbeds and datasets in a future column. “Attacking NTP's Authenticated Broadcast Mode” analyses the security problems that can occur when the Network Time Protocol (NTP) is used in broadcast mode. DNSSEC adds digital signatures to the DNS, significantly increasing the size of DNS responses. Two papers published in this issue already provide such artifacts. Pedro Garcia Lopez (Universitat Rovira i Virgili), Alberto Montresor (University of Trento), Dick Epema (Delft University of Technology), Anwitaman Datta (Nanyang Technological University), Teruo Higashino (Osaka University), Adriana Iamnitchi (University of South Florida), Marinho Barcellos (Universidade do Vale do Rio dos Sinos), Pascal Felber, Etienne Riviere (University of Neuchatel) In many aspects of human activity, there has been a continuous struggle between the forces of centralization and decentralization. 59x faster at the 95th percentile using Aalo in comparison to per-flow mechanisms. Costin Raiciu from University Politehnica of Bucharest (Romania) who joins our Editorial board. You probably use computers and programs on a daily basis, but you might not be aware that the first "pre-computers" didn't even use electricity or that the first computer programmer was a woman. Replication of research results is obviously facilitated if the artifacts used to write the paper are available. It shuffles captured packets to multiple analysis servers using load balancers built on switch ASICs, and it sends "guided probes" to test or confirm potential faults. Unfortunately, datacenter operators are generally reticent to share the actual requirements of their applications, making it challenging to evaluate the practicality of any particular design. I am also quite excited about a recent change by which our SIG conferences will make public the list of the papers nominated for best papers awards, beyond the winning one. The implications are serious, from a person contacting undesired services or unwillingly exposing private information, to a company being unable to control the flow of its information to the outside world. This paper puts forth our vision to provide global access to the Internet through a universal communication architecture that combines two emerging paradigms, namely that of Information Centric Networking (ICN) and Delay Tolerant Networking (DTN). Some of our work can influence, in one direction or another, the evolution of our society and some of our design choices may have a huge impact in the long term. Hitesh Ballani has finished his tenure.