Monday, April 30, 2012

[ns] Broadcasting a UDP ns2.34 802.11Ext

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


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