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Technical Rehearsals Matter!

Network Trouble-Shooting. Technical Rehearsals Matter!. Bob Riddle, Internet2 14 January 2004. Rehearse, rehearse, & rehearse. Questions to answer before opening night Can I “stretch” the stage from here to there? do you need a 2 lane road or an expressway?

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Technical Rehearsals Matter!

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

  2. Rehearse, rehearse, & rehearse Questions to answer before opening night • Can I “stretch” the stage from here to there? • do you need a 2 lane road or an expressway? • will you need the highway during rush hour? • do you need to be able to “talk”, “listen”, or both? • Do I live in the right kind of “neighborhood” ? • time to think about FDX, multicast, & switches • time to make some new friends & acquire new toys • What sort of guarantees can I offer my boss?

  3. Stretching the “Stage” Issues to consider when “stretching” the stage • Speed: do you need a freeway, city street, or a dirt road? (mbps) • Latency: is it a “telephone” call or a “movie”? (rtt) • Packet Loss: how much of the content do you care about? (100% … 90% … 50% … 10% …)

  4. Stretching the “Stage” -cont- Plan for a meaningful rehearsal What kind of highway do you need? • H.323 ~= 384 kbps • Mpeg1 ~= 1.5 mpbs • Mpeg2 ~= 4 – 16 mbps • DV ~= 30 mbps • HDTV ~= 19.2 – 270 mbps What kind street do you really need? • One way? (streaming, broadcast) • Two way? (interactive voice & video) • Many way? (more than 2 end points) Do the math! (and budget for the asphalt!)

  5. Rush hour traffic or 3 a.m. traffic? Some lessons learned from the Bing Theater • Good idea - Test early & test often • Sunday evening exercising the network • Monday morning “exercise” • Monday afternoon “exercise” • Result – Hayward suffered from congestion • Lessons learned: • Sun night traffic != to weeknight network traffic • Mon a.m. traffic != to Mon p.m. network traffic it’s important to rehearse the network during show time

  6. You have to live in the Right Neighborhood Take a look at your local neighborhood • Run internal tests across your LAN • Make sure to test what you hope to use! • Find a friend “next door” to test with • Learn about ping, traceroute, iperf, Internet2 Detective, VRVS & what they can tell you • Start thinking about what “roads” you’ll need to travel to the next neighborhood(s)

  7. My list or “normal” E2E tests Bandwidth tests • iperf (http://dast.nlanr.net/Projects/Iperf/) • allows for tcp, udp, multicast, bi-directional • allows testing for FDX needs • allows testing at various rates (KkMm) Multicast Tests • iperf (http://dast.nlanr.net/Projects/Iperf/) • Vic, rat (http://www.vrvs.org) • inSORS (http://internet2.insors.net) • rcBridge (http://if.anu.edu.au/SW/rcbridge.html)

  8. Use the tools! Results of such tests – NWS example! • bandwidth tests: • discovered DHCP server gateway problem at NWS • discovered 30 mbps with 0% packet loss was the best • FDX testing: • discovered misconfiguration between PC & switch in Ann Arbor Internet2 office • PC diagnostics said everything was fine, switch display indicated HDX connection to the PC • Human tests: • involve participants in “successful” network testing • need someone with the correct event perspective

  9. Can I buy these tools at Wal-Mart? What did we learn from the Rialto event? • 2 days to learn/fix/configure the network (help!) • What if we could have shipped a no-brainer PC to “almost” endpoint that would all you to remotely exercise all these tools? Introducing the “cakebox” • No operator, no monitor, keyboard, or mouse required • Small, inexpensive, and easy to ship PC • Just plug in a network cable & a power cable • Provide user interface for non-network geeks • http://envoy.internet2.edu/pioneer/

  10. Tools - cont - http://detective.internet2.edu • Runs on Windows XP • Runs on Mac OSX • Runs E2E on detective machines • Its purpose is to tell you if there is any “hope”!

  11. Other tools you can use • http://e2epi.internet2.edu// • http://www.pingplotter.com/ • http://www.insecure.org/nmap/ • http://www.traceroute.org/ • E2EP (end-to-end performance group) • Questions?

  12. www.internet2.edu

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