Hi everyone, I'm simulating a protocol for adhoc networks but I'm facing a problem with packets loss. The configuration parameters are:
set opt(chan) Channel/WirelessChannel set opt(prop) Propagation/TwoRayGround set opt(netif) Phy/WirelessPhy set opt(mac) Mac/802_11 set opt(ifq) Queue/DropTail/PriQueue set opt(ll) LL set opt(ant) Antenna/OmniAntenna set opt(eMod) EnergyModel set opt(god) on set opt(iEne) 50.0 set opt(rxP) 0 ; set opt(txP) 0.0001 ; set opt(idlePower) 0000285 ; set opt(logeng) "on" set opt(x) 50 ;# X dimension of the topography set opt(y) 50 ;# Y dimension of the topography set opt(ifqlen) 1000 ;# max packet in ifq set opt(seed) 0.0 set opt(adhocRouting) "NullRouter" set opt(nn) 50 ;# number of sensor nodes are simulated set opt(cp) "" set opt(sc) "./scn/scen- 50x50-50.sce" set opt(stop) 900 ;# simulation time set opt(tr) "./log/out.tr" ;# trace file set opt(nam) "" ;# nam file# Change here if needed set opt(range) 15 I've tried to disseminate my packets with broadcast but the amount of lost packets was very high. So, I've changed to unicast messages to the nodes' neighbors and the amount of lost packets decreased. But I'm still losing important packets. In my trace file I can see (END) d -t 900.000100000 -Hs 40 -Hd -1 -Ni 40 -Nx 40.00 -Ny 40.00 -Nz 0.00 -Ne 28.976234 -Nl IFQ -Nw END -Ma 0 -Md 0 -Ms 28 -Mt 800 -Is 40.251 -Id 49.251-It INITCOLLECT -Il 0 -If 0 -Ii 868 -Iv 1 -Is 40.251 -Id 49.251 -It INITCOLLECT -Il 0 -If 0 -Ii 868 -Iv 1 and sometimes I read (ARP): d -t 601.500028645 -Hs 20 -Hd -1 -Ni 20 -Nx 20.00 -Ny 20.00 -Nz 0.00 -Ne 35.574376 -Nl IFQ -Nw ARP -Ma 0 -Md 0 -Ms 14 -Mt 800 -Is 20.251 -Id 12.251-It INITCOLLECT -Il 0 -If 0 -Ii 334 -Iv 1 -Is 20.251 -Id 12.251 -It INITCOLLECT -Il 0 -If 0 -Ii 334 -Iv 1 and sometimes there is no drops in my trace file but I'm sure that some of them were lost ( I count the amount of packets sent and the amount of of packets received and they should match). * Why are these packets (the ones that don't appear in the trace file) being dropped? * Why are those packets (the ones that show "-Nw ARP" in the trace file) being dropped? * And, most important, what can I do to avoid these drops? Thank you in advance. Regards, Renan
