Hi all,
in my scenario there is 2 node
node 1 create cbr over udp and in th nocde 2 the null-agent
the source craete a paket with size of 100 Bytes the rate is 115 Kb/s
like follow:
-----------------------------------------------------------
set null1 [new Agent/Null]
$ns_ attach-agent $node_(1) $null1
set source [new Agent/UDP]
$source set class_ 2
$ns_ attach-agent $node $source
set cbr0 [new Application/Traffic/CBR]
#
$cbr0 set packetSize_ 100
$cbr0 set rate_ 115kb
#
$cbr0 attach-agent $source
$ns_ connect $source $sink
$ns_ at 0.001 "$cbr0 start"
$ns_ at 4.9 "$cbr0 stop"
------------------------------------------------------
In the Trace file i get the at AGENT 120 Byte, 20Byte more than what the
source does create (100 Byte)
Trace FIle: (*) Paket created (**) paket received AT AGENT
------------------------------------------------------
(*)
s 0.001000000 _0_ AGT --- 0 cbr 100 [0 0 0 0] ------- [0:0 1:0 32 0] [0] 0 0
r 0.001000000 _0_ RTR --- 0 cbr 100 [0 0 0 0] ------- [0:0 1:0 32 0] [0] 0 0
s 0.001000000 _0_ RTR --- 0 cbr 120 [0 0 0 0] ------- [0:0 1:0 32 1] [0] 0 0
s 0.001095000 _0_ MAC --- 0 ARP 80 [0 ffffffff 2 806] ------- [REQUEST 2/0
0/1]
r 0.001735333 _1_ MAC --- 0 ARP 28 [0 ffffffff 2 806] ------- [REQUEST 2/0 0/1]
s 0.002090333 _1_ MAC --- 0 ARP 80 [13a 2 4 806] ------- [REPLY 4/1 2/0]
r 0.002730667 _0_ MAC --- 0 ARP 28 [13a 2 4 806] ------- [REPLY 4/1 2/0]
s 0.002740667 _0_ MAC --- 0 ACK 38 [0 4 0 0]
r 0.003045000 _1_ MAC --- 0 ACK 38 [0 4 0 0]
s 0.003354667 _0_ MAC --- 0 cbr 172 [13a 4 2 800] ------- [0:0 1:0 32 1] [0] 0 0
r 0.004731000 _1_ MAC --- 0 cbr 120 [13a 4 2 800] ------- [0:0 1:0 32 1] [0] 1 0
s 0.004741000 _1_ MAC --- 0 ACK 38 [0 2 0 0]
(**)
r 0.004756000 _1_ AGT --- 0 cbr 120 [13a 4 2 800] ------- [0:0 1:0 32 1] [0] 1 0
r 0.005045333 _0_ MAC --- 0 ACK 38 [0 2 0 0]
------------------------------------------------------
WHY????
thank you
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