Introduction to Network Simulator NS2

By Teerawat Issariyakul

Creation to community Simulator NS2 is a primer offering fabrics for NS2 rookies, no matter if scholars, professors, or researchers for figuring out the structure of community Simulator 2 (NS2) and for incorporating simulation modules into NS2. The authors speak about the simulation structure and the major elements of NS2 together with simulation-related items, community items, packet-related items, and helper items. The NS2 modules incorporated inside are nodes, hyperlinks, SimpleLink items, packets, brokers, and purposes. additional, the ebook covers 3 helper modules: timers, random quantity turbines, and blunder types. additionally integrated are chapters on precis of debugging, variable and packet tracing, outcome compilation, and examples for extending NS2. appendices give you the information of scripting language Tcl, OTcl and AWK, to boot item orientated programming used broadly in NS2.

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222 10. 2. 1 type Acker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224 10. 2. 2 classification TcpSink . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228 10. three TCP Sender . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 10. four TCP Packet Transmission capabilities . . . . . . . . . . . . . . . . . . . . . . . 230 10. four. 1 functionality sendmsg(nbytes) . . . . . . . . . . . . . . . . . . . . . . . . 231 10. four. 2 functionality ship much(force,reason,maxburst) . . . . . . 232 10. four. three functionality output(seqno,reason) . . . . . . . . . . . . . . . . . . 234 10. four. four functionality ship one() . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236 10. five ACK Processing services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237 10. five. 1 functionality recv(p,h) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238 10. five. 2 functionality recv newack helper(pkt) . . . . . . . . . . . . . . . . 239 XVI Contents 10. five. three 10. 6 Timer 10. 6. 1 10. 6. 2 10. 6. three 10. 6. four 10. 6. five 10. 6. 6 10. 6. 7 10. 6. eight 10. 6. nine functionality newack(pkt) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241 comparable capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242 RTT pattern assortment . . . . . . . . . . . . . . . . . . . . . . . . . . . 242 RTT Estimation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244 evaluation of country Variables . . . . . . . . . . . . . . . . . . . . . . . 244 Retransmission Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246 functionality evaluate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247 functionality rtt update(tao) . . . . . . . . . . . . . . . . . . . . . . . . 248 functionality rtt timeout() . . . . . . . . . . . . . . . . . . . . . . . . . . 250 functionality rtt backoff() . . . . . . . . . . . . . . . . . . . . . . . . . . 251 functionality set rtx timer()and functionality reset rtx timer(mild,backoff) . . . . . . . . . . . . . . . . . . 252 10. 6. 10 functionality newtimer(pkt) . . . . . . . . . . . . . . . . . . . . . . . . . . 253 10. 6. eleven functionality timeout(tno) . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 10. 7 Window Adjustment services . . . . . . . . . . . . . . . . . . . . . . . . . . . . 255 10. 7. 1 functionality opencwnd() . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256 10. 7. 2 functionality slowdown(how) . . . . . . . . . . . . . . . . . . . . . . . . . . 256 10. eight bankruptcy precis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 259 eleven software: person call for Indicator . . . . . . . . . . . . . . . . . . . . . . . 261 eleven. 1 courting among an program and a delivery Layer Agent . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 261 eleven. 2 information of sophistication software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265 eleven. 2. 1 capabilities of sessions program and Agent . . . . . . . . 265 eleven. 2. 2 Public capabilities of sophistication program . . . . . . . . . . . . . 266 eleven. 2. three similar Public services of sophistication Agent . . . . . . . . . . . . 267 eleven. 2. four OTcl instructions of sophistication software . . . . . . . . . . . . . 268 eleven. three Traffic turbines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268 eleven. three. 1 an outline of sophistication TrafficGenerator . . . . . . . . . . . 268 eleven. three. 2 major Mechanism of a Traffic Generator . . . . . . . . . . . . . 270 eleven. three. three integrated Traffic turbines in NS2 . . . . . . . . . . . . . . . . . . 272 eleven. three. four type CBR site visitors: An instance Traffic Generator . . . 275 eleven. four Simulated functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277 eleven. four. 1 FTP (File move Protocol) . . . . . . . . . . . . . . . . . . . . . . 278 eleven. four. 2 Telnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278 eleven. five bankruptcy precis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279 12 similar Helper sessions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281 12. 1 Timers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281 12. 1. 1 Implementation idea of Timer in NS2 .

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