Wide-Area Traffic: Vern Lawrence The Failure of Poisson Modeling Paxson Berkeley University Road, and Sally Floyd* and Berkeley 94720 Laboratory of California, CA EECS Division, 1 Cyclotron vern Berkeley @ee.lbl.gov, firstname.lastname@example.org Abstract Network arrivals are often modeled as Poisson processes for anaeven though a number of traffic studies have shown are not exponentially distributed. We evalcontraces, investigating a number of wide-area TCP arrivals, FTPDATA packet arrivals) such lytic simplicity, of user sessions (TELNET connections, lTP control connections); processes; that they fail as accurate models for other WAN self-similar processes. arrival and that WAN packet arrival processes appear better modeled using that packet interarrivals uate 21 wide-area For our study we analyze 21 traces of wide-area TCP traffic. NET traffic, discuss the implications at different We consider both previous and new models of aspects of FTP and TELof these models for burstiness Poisson time scales, and compare the results of the models with of the burstiness of TCP (We restrict our study to arrivaf processes (session and connection nection arrivals within to determine processes. cesses with interarrivals interarrivals FI PDATA completely liminary self-similarity the error introduced and tile-transfer, FTP sessions, and TELNET by modeling them using Poisson as Poisson
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