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Using DSR in ns2

Using DSR in ns2. Rishi Sinha. Objective. Quick introduction to using DSR Not about wireless simulation as such Leaves not much in terms of using DSR DSR code recompiling for various options DSR code recompiling for various trace messages. DSR characteristics. Reactive Source-routing

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Using DSR in ns2

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  1. Using DSR in ns2 Rishi Sinha

  2. Objective • Quick introduction to using DSR • Not about wireless simulation as such • Leaves not much in terms of using DSR • DSR code recompiling for various options • DSR code recompiling for various trace messages

  3. DSR characteristics • Reactive • Source-routing • ARP-like behavior • Router object in ns – sends and receives packets from agents and link layer

  4. DSR basic mechanisms • Route discovery – limited • Route discovery – flooding • Source route construction • Route reply • Route error • Salvaging

  5. DSR in ns script $ns_ node-config -adhocRouting $val(rp) \ -llType $val(ll) \ -macType $val(mac) \ -ifqType $val(ifq) \ -ifqLen $val(ifqlen) \ -antType $val(ant) \ -propType $val(prop) \ -phyType $val(netif) \ -channelType $val(chan) \ -topoInstance $topo \ -agentTrace ON \ -routerTrace ON \ -macTrace OFF \ -movementTrace OFF

  6. The val array set val(chan) Channel/WirelessChannel ;# channel type set val(prop) Propagation/TwoRayGround ;# radio-propagation model set val(netif) Phy/WirelessPhy ;# network interface type set val(mac) Mac/802_11 ;# MAC type set val(ifq) Queue/DropTail/PriQueue ;# interface queue type set val(ll) LL ;# link layer type set val(ant) Antenna/OmniAntenna ;# antenna model set val(ifqlen) 50 ;# max packet in ifq set val(nn) 2 ;# number of mobilenodes set val(rp) DSR ;# routing protocol

  7. DSR code in ns • $NS/dsr/dsragent.cc • Edit to make changes • In $NS: • make depend • make • ns defaults - $NS/tcl/lib/ns-default.tcl

  8. DSR traces using node-config • $ns_ node-config -routerTrace ON • s 128.014398266 _0_ RTR --- 3 DSR 24 [0 0 0 0] ------- [0:255 2:255 32 0] 1 [1 2] [0 2 0 0->0] [0 0 0 0->0] • Send • Time • Node • Router or agent • Packet (event) id • Packet type • Size

  9. DSR traces using DSR code • Unconditional trace () statements • Conditional trace statements – verbose • trace() implementation checks for verbose • So unconditional not output • Make changes in dsragent.cc and recompile ns

  10. Non-verbose output void DSRAgent::trace(char* fmt, ...) { ... if (verbose) { va_start(ap, fmt); vsprintf(logtarget->pt_->buffer(), fmt, ap); logtarget->pt_->dump(); va_end(ap); } }

  11. Non-verbose output • Remove the conditional shown above • SRR 127.93668 _0_ new-request 0 0 #1 -> 2 • SRR 128.00957 _0_ new-request 16 0 #2 -> 2 • SRR 128.021161410 _2_ reply-sent 2 -> 0 #2 (len 3) [(0) 1 2 ]

  12. Verbose output • Let the conditional be • Output will include non-verbose output • Change these lines: • static const int verbose = 0; • static const int verbose_srr = 0;

  13. Verbose output • S$miss 127.93668 _0_ 0 -> 2 • Sdebug 127.93668 _0_ stuck into send buff 0 -> 2 • S$hit 135.40639 _0_ 0 -> 2 [(0) 1 2 ]

  14. DSR options • Timeouts • Time arp_timeout = 30.0e-3; // (sec) arp request timeout • Time rt_rq_period = 0.5; // (sec) length of one backoff period • Time rt_rq_max_period = 10.0; // (sec) maximum time between rt reqs • bool dsragent_snoop_forwarded_errors = true; // give errors we forward to our cache? • bool dsragent_snoop_source_routes = true; // should we snoop on any source routes we see?

  15. Trace file analysis • Using grep and awk to get times of all cache misses: $ cat file.tr > awk ‘$1==“S\$miss”{print $2, $3}’ • Using grep and awk to get times of all drops: $ cat file.tr > awk ‘$1==“SRR” && $4==“dropped”{print $2, $3}’

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