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Crow "Every day's a research experiment" -T. GrayXX W9& Questions   Seen any 404s go away by themselves lately? Is the trend getting better or worse? What is the max retry count in MS Windows? TcpMaxDataRetransmissions = ? Could there be a connection?<}}   $} :'Thesis  >The (open) Internet died in 2003 at the hands of slammer and blaster It's no longer about pervasive connectivity& now it s all about (selective) isolation Tolerance for, and frequency of, glitches.. is increasing Current Internet model is busted& e.g. silent failures, poor diagnostics   ;( Buzz Words   *trust-mediated convergence/virtualization++ *<) Miscellany  Perimeter Protection Paradox Good ol' days of the network utility model Defense-in-Depth vs MTTD, etc Claim: M-T-to-penetration, innovation, diagnosis ~ d**2 How many arbitrary PEPs before the overall system becomes non-deterministic?\m1M&1L >"4U6=*Trends  Software-defined networks Personal lambdas Port 80/443 tunneling to get thru firewalls Encryption End-point firewalls (changes diagnostic picture) More policy boundaries; less effective Regulation/compliance >+Imagine  Being in a NOC with an irate customer on the phone: Customer: "Is the network broken?" NOC: "I give up, is it? L5=5 ?, Hard problems   ADDOS Worsening MTTG Diagnosis complexity (MTTD) Provisioning complexity (vs. network utility) Mismatch between best and common deployment e.g. tcp retry count, duplex mismatch, stack-tuning S/N ratio of behavioral IDS monitors Path policy discovery Trust management Policy enforcement is silent; looks like net failure0BP  4    @-,Hard problems (cont d)  'Managing heterogenity: bugs, conventions (jumbos) Organizational vs. geographic topologies Scaling personal lambdas Managing/diagnosing with e2e encryption Exception management Seduction of more protocols (e.g. MTR) Attribution vs. anonymity Multicast fault containment Optimal fault-zone sizing<2PZ      $ A. Conclusions  ( _Plenty of work to do Help needed now! 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