Solving End-to-End Problems Internet2 Staff Meeting Ann Arbor 29 November, 2001.

Slides:

Advertisements

Similar presentations

End to End Performance Initiative. Internet2 Mission Develop and deploy advanced network applications and technologies, accelerating the creation of tomorrows.

Advertisements

By the end of this section, you will know and understand the hardware and software involved in making a LAN!

Internet Hardware Connected ‘Servers’ Servers provide: – Web pages – – File downloads.

S3 Computer Literacy Internet Technology.

Chapter 5 Networks. Learning Objectives After reading this chapter the reader should be able to: Understand the importance of networks in the field of.

Basic Network Concepts And Troubleshooting. A Simple Computer Network for File Sharing.

QoS Solutions Confidential 2010 NetQuality Analyzer and QPerf.

Introduction to the Internet September 7, 2005 Lecture 1.

The Transport Layer Chapter 6. The TCP Segment Header TCP Header.

The Transport Layer Chapter 6. Performance Issues Performance Problems in Computer Networks Network Performance Measurement System Design for Better Performance.

1 Networks and Internet Objectives Understand basic concepts in Networking Network Types Understand basic concepts in Internet Internet Services Become.

The Transport Layer Chapter 6. The Transport Service Services Provided to the Upper Layers Transport Service Primitives Berkeley Sockets An Example of.

The StarNet Analyzer. Contact SNA Department x172

T.Sharon-A.Frank Multimedia Internet/Web MM Interaction Tools.

TCP/IP Tools Lesson 5. Objectives Skills/ConceptsObjective Domain Description Objective Domain Number Using basic TCP/IP commands Understanding TCP/IP3.6.

2440: 141 Web Site Administration Remote Web Server Access Tools Instructor: Enoch E. Damson.

Semester One 2001/2002 Sheffield Hallam University1 Modems allow computers to exchange information over the telephone network by: –converting outgoing.

Using Multimedia on the Web

LAN Local Area Network A local area network (LAN) is a computer network that interconnects computers in a limited area such as a home, school, computer.

Chapter 9A Network Basics.

1 Web Server Administration Chapter 9 Extending the Web Environment.

Chapter 4. After completion of this chapter, you should be able to: Explain “what is the Internet? And how we connect to the Internet using an ISP. Explain.

Questions about communication link and speed ?. Why was Internet access slower from SAC than from ERC? Packets from both reach the Internet in two “hops.”

Introduction network Protocol

IT Introduction to Information Technology. The Internet & World Wide Web Began in 1969 with the ARPANET (Advanced Research Project Agency Network)

Technical Rehearsals Matter! Bob Riddle, Internet2 14 January 2004 Network Trouble-Shooting.

Chapter 1: The Internet and the WWW CIS 275—Web Application Development for Business I.

Connecting People To Information 강 사 : 전 필 복 [CCIE # 4244] Connecting People To Information.

MySQL and PHP Internet and WWW. Computer Basics A Single Computer.

Copyright Jim Martin The Internet Dr. Jim Martin

1 The Internet and Networked Multimedia. 2 Layering  Internet protocols are designed to work in layers, with each layer building on the facilities provided.

 End to End Performance Initiative Russ Hobby HENP Networking Working Group Meeting, Ann Arbor, Michigan 26 October 2001.

5 October 2001  End to End Performance Initiative Performance Measurement.

Chapter 6-2 the TCP/IP Layers. The four layers of the TCP/IP model are listed in Table 6-2. The layers are The four layers of the TCP/IP model are listed.

Networks CS105. What is a computer network? A computer network is a collection of computing devices that are connected in various ways so that they can.

© 2010 Cisco Systems, Inc. All rights reserved. 1 CREATE Re-Tooling Exploring Protocols with Wireshark March 12, 2011 CREATE CATC and Ohlone College.

Communication Systems The Internet The largest wide area network in the world. It is made up of thousands of linked networks. What.

Teaching and Learning with Technology ck to edit Master title style  Allyn and Bacon 2002 Teaching and Learning with Technology k to edit Master title.

Proxy Installer for Windows Squid: Squid is a caching proxy for the Web supporting HTTP, HTTPS, FTP, and more. It reduces bandwidth and improves response.

Networking Fundamentals. Basics Network – collection of nodes and links that cooperate for communication Nodes – computer systems –Internal (routers,

Lecture (Mar 23, 2000) H/W Assignment 3 posted on Web –Due Tuesday March 28, 2000 Review of Data packets LANS WANS.

WEBMASTER 3224 PHYSICAL VS LOGICAL COMPONENTS OF THE INTERNET AND NETWORKS.

Networks. Ethernet  Invented by Dr. Robert Metcalfe in 1970 at Xerox Palo Alto Research Center  Allows group of computers to communicate in a Local.

ITGS Network Architecture. ITGS Network architecture –The way computers are logically organized on a network, and the role each takes. Client/server network.

CS 101 – Nov. 23 Communication, continued LANs –Bus (ethernet) communication –Token ring communication How the Internet works: TCP/IP.

Internet Essentials.

Internet2 End-to-End Performance Initiative Eric L. Boyd Director of Performance Architecture and Technologies Internet2.

1 Welcome CMSC102 Information Technology and Internet Research I am John Arras Office: 1109 A.V. Williams Building Phone:

TCP continued. Discussion – TCP Throughput TCP will most likely generate the saw tooth type of traffic. – A rough estimate is that the congestion window.

Dr. John P. Abraham Introduction to Computer Networks INTRODUCTION TO COMPUTER NETWORKS.

TCP ETSF10 – Internet Protocols Home / Laboratory Projects II Autumn 2015.

Internet Flow By: Terry Hernandez. Getting from the customers computer onto the internet Internet Browser

Windows Administration How to protect your computer.

Computing Strategies. A computing strategy should identify – the hardware, – the software, – Internet services, and – the network connectivity needed.

Lecture 4 unit 1. categories of network A network can be categorized as a 1.Local area network. 2.Wide area network. 3.Metropolitan area network. 4.Personal.

WHAT'S THE DIFFERENCE BETWEEN A WEB APPLICATION STREAMING NETWORK AND A CDN? INSTART LOGIC.

Chapter 3.  Help you understand what hardware is required to allow networks to work including: ◦ Repeaters ◦ Hub ◦ Switch ◦ Bridge ◦ Gateway (not needed.

COMPUTER NETWORKING 2 LECTURE 5: CABLE MODEMS Cable Modems.

Chapter 7: Using Network Clients The Complete Guide To Linux System Administration.

A Recommendation of Technology EDMT 627 A. Howard A. Mehney.

Oops or How to Recover from Problems with your WRT54G(L)

Website Deployment Week 12. Software Engineering Practices Consider the generic process framework – Communication – Planning – Modeling – Construction.

More on WANs Fiber Optic Cables Used in Internet backbone

Lab 2: Packet Capture & Traffic Analysis with Wireshark

How is all that data traffic controlled on the Internet?

Lab A: Installing and Configuring the Network Load Balancing Driver

Chapter 6 The Transport Layer.

IS 4506 Server Configuration (HTTP Server)

Grace Esteban Crash Course Grace Esteban

Presentation transcript:

Solving End-to-End Problems Internet2 Staff Meeting Ann Arbor 29 November, 2001

The Problem Applications Developer System Administrator LAN Administrator Campus Networking Gigapop BackboneCampus Networking LAN Administrator System Administrator Applications Developer How do you solve a problem along a path? Hey, this is not working right! The computer Is working OK Talk to the other guysEverything is AOK No other complaints The network is lightly loaded All the lights are green We don’t see anything wrong Looks fine Others are getting in ok Not our problem

Problem 1 You finally get your own brand new personal polycom unit to do videoconferencing with your colleagues so you will stop hogging the conference room. You plug it into an ethernet port in your office that has been working just fine for and web surfing. You power it up, and try to contact your colleague in San Diego. It connects,but you get lots of "lightening symbols" on the display, the video is very jerky, and the audio drops out.

Problem 2 You start an application that transfers massive amounts of data overnight. You go home and in the middle of the night the other site calls and tells you the the transfer rate has fallen dramatically, the network must be broken and you need to get it fixed. Of course it all worked fine in the tests on smaller data sets.

Problem 3 You just got your new computer, a GoFast 9000 with GigE interfaces and want to see what this puppy will do. You know that you have a fast path all the way to U of X and want to test the file transfer speed. You crank up an FTP and watch the stats expecting, through slow-start, that it will speed up until some packet loss where it will back down. The performance pegs at 10k packets per second but there is still no packets loss.

Problem 4 You are trying to transfer 10GB of medical research image data between your site in California and your colleague's site in New York.The data servers your site are well tuned for TCP: they have large buffers,and allow large window sizes, and have all the latest spiffy TCP options to recover from packet loss. They both have GigE connections locally, although you know the wide-area bottleneck is an OC- 3 POS connection.You try to run a transfer, and find you get 7 megabits a second! Why aren't you getting a significant fraction of the bandwidth? It's going to require a lot of coffee to wait for this connection to complete...

How can we improve problem solving? Knowing what is possible Diagnostic tools Finding people Modes of communication Scaling of it all