Hi, I have no solution for you in NS2. However, I have a remark on your address/port choice. I guess that by choosing -1, you fill the address field with 255.255.255.255 as IP address in dotted decimal notation? The port number choice of 0 is a bit strange. Although you are using IP broadcast you - strictly speaking - still need a legitimate port number. Indeed, you choose a particular protocol by choosing the port address. As an example, DHCP uses IP broadcast initially based on UDP67 / UDP68.
Regards, Frank On May 1, 2012, at 5:36 AM, Paulo Robson S. F. wrote: > > Hi, > > I want to broadcast a packet using an udp agent. I found some solutions at > this maillist but > neither satisfactory. > > I just want to send broadcast packet from 1 node to another 2 nodes in his > range. My idea was > change the dst ip to -1 and dst port to 0 because i saw somewhere that is > the way to broadcast. > > I'm using the 802.11Ext model of MAC, the new module of the NS 2.34 > > Well, I made this way: > > set udp0 [new Agent/UDP] > $ns attach-agent $node $udp0 > set cbr2 [new Application/Traffic/CBR] > > $cbr2 set packetSize_ 128 > $cbr2 set interval_ 0.015 > $cbr2 set random_ 1 > $cbr2 set maxpkts_ 1000 > > $cbr2 attach-agent $udp0 > > #to broadcast i used this: > $udp0 set dst_addr_ -1 > $udp0 set dst_port_ 0 > > In the trace file seems to be right, but i dont know if only this change of > address and port of destination > is indeed a broadcast to all neighbors. > > First lines of trace file: > s 0.500000000 _2_ AGT --- 0 cbr 128 [0 0 0 0] ------- [2:0 -1:0 32 0] [0] > 0 0 > r 0.500000000 _2_ RTR --- 0 cbr 128 [0 0 0 0] ------- [2:0 -1:0 32 0] [0] > 0 0 > s 0.500000000 _2_ RTR --- 0 cbr 148 [0 0 0 0] ------- [2:0 -1:0 32 0] [0] > 0 0 > s 0.500025000 _2_ MAC --- 0 cbr 176 [0 ffffffff 2 0] ------- [2:0 -1:0 32 > 0] [0] 0 0 > r 0.500546664 _1_ MAC --- 0 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 32 > 0] [0] 1 0 > r 0.500546841 _0_ MAC --- 0 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 32 > 0] [0] 1 0 > r 0.500571664 _1_ RTR --- 0 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 32 > 0] [0] 1 0 > r 0.500571664 _1_ AGT --- 0 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 31 > 0] [0] 1 0 > r 0.500571841 _0_ RTR --- 0 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 32 > 0] [0] 1 0 > r 0.500571841 _0_ AGT --- 0 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 31 > 0] [0] 1 0 > s 0.507505094 _2_ AGT --- 1 cbr 128 [0 0 0 0] ------- [2:0 -1:0 32 0] [1] > 0 0 > r 0.507505094 _2_ RTR --- 1 cbr 128 [0 0 0 0] ------- [2:0 -1:0 32 0] [1] > 0 0 > s 0.507505094 _2_ RTR --- 1 cbr 148 [0 0 0 0] ------- [2:0 -1:0 32 0] [1] > 0 0 > s 0.507530094 _2_ MAC --- 1 cbr 176 [0 ffffffff 2 0] ------- [2:0 -1:0 32 > 0] [1] 0 0 > r 0.508051758 _1_ MAC --- 1 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 32 > 0] [1] 1 0 > r 0.508051934 _0_ MAC --- 1 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 32 > 0] [1] 1 0 > r 0.508076758 _1_ RTR --- 1 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 32 > 0] [1] 1 0 > r 0.508076758 _1_ AGT --- 1 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 31 > 0] [1] 1 0 > r 0.508076934 _0_ RTR --- 1 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 32 > 0] [1] 1 0 > r 0.508076934 _0_ AGT --- 1 cbr 148 [0 ffffffff 2 0] ------- [2:0 -1:0 31 > 0] [1] 1 0 > > > Thanks guys > > > Att, > > -- > Paulo Robson SF > Computação UFC > Semestre VII
