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Nick Feamster

Nick Feamster. Research Interest: Networked Systems Arriving January 2006 Likely teaching CS 7260 in Spring 2005 Here off-and-on until then. Email works well. CS 7001 Mini-projects posted: http://www.cc.gatech.edu/~feamster/mini-projects/.

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Nick Feamster

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  1. Nick Feamster • Research Interest: Networked Systems • Arriving January 2006 • Likely teaching CS 7260 in Spring 2005 • Here off-and-on until then. Email works well. • CS 7001 Mini-projects posted: • http://www.cc.gatech.edu/~feamster/mini-projects/ feamster@cc.gatech.eduhttp://www.cc.gatech.edu/~feamster/

  2. The Internet Internet Routing • Large-scale: Thousands of autonomous networks • Self-interest: Independent economic and performance objectives Abilene Georgia Tech Comcast AT&T Level3

  3. Problems • Network Security • How to guarantee where traffic will or won’t go? • How to counter Web censorship and surveillance? • What techniques are spammers using? • Network Reliability and Troubleshooting • How can operators tell when they’ve made mistakes? • How to protect the network from others? • Connectivity at the network edge

  4. Today: Reactive Operation What happens if I tweak this policy…? • Problems cause downtime • Problems often not immediately apparent Revert No Yes Desired Effect? Wait for Next Problem Configure Observe

  5. Catastrophic Configuration Faults “…a glitch at a small ISP… triggered a major outage in Internet access across the country. The problem started when MAI Network Services...passed bad router information from one of its customers onto Sprint.” -- news.com, April 25, 1997 “Microsoft's websites were offline for up to 23 hours...because of a [router] misconfiguration…it took nearly a day to determine what was wrong and undo the changes.” -- wired.com, January 25, 2001 “WorldCom Inc…suffered a widespread outage on its Internet backbone that affected roughly 20 percent of its U.S. customer base. The network problems…affected millions of computer users worldwide. A spokeswoman attributed the outage to "a route table issue." -- cnn.com, October 3, 2002 "A number of Covad customers went out from 5pm today due to, supposedly, a DDOS (distributed denial of service attack) on a key Level3 data center, which later was described as a route leak (misconfiguration).” -- dslreports.com, February 23, 2004

  6. “Drive-By” ISP • More coverage: • Buy service - Charge passersby • Challenges: • Privacy- Accounting How to get credit for opening my access point while preserving the privacy of those who use it?

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