Re: [ns] new 802.11 - CAP proportion too big
On Mon, 2006-08-14 at 23:54 +0100, Pedro Fortuna wrote: I'll do my best trying to find the problem. I'll submit a patch if I succeed correcting it (assuming there's a problem). There is a question on the DCF implementation part I'd like to ask if you don't mind. It seems that there's no Packet Loss. I know 802.11 DCF MAC's is an acknowledged service with up to 7 retransmissions, which eliminates almost every packet loss due to transmission errors. But shouldn't it at least have some packet loss due to limited queue sizes? I have done a simulation where I create 200 nodes exchanging 400 voip flows and although the maximum delay is a lot higher when compared with a 20 or 50 node simulation, it still does not show any packet loss. This suggests that in your implementation you have a very long queue (or infinite size). Is this true? If so, In your opinion, would it be complicated to implement a limited queue size? I cannot remember if the queue is size-bound or delay-bound. My curent code (in yans) is both size and delay bound with a default size of 400 packets. The relevant code is located in mac-queue-80211.cc. Mathieu
[ns] olsr implementation
hi evrybody, is there any available OLSR implentation under ns-2.? if yes, how could i get it ? thanks a lot ramzi tka
Re: [ns] create environment problem in cygwin
Hi, I don't think it makes sense to put all the /cygdrive/c/ stuff in your path - remember, that under Cygwin /cygdrive/c/cygwin/ already point to your root (/) dir - so it might help if you only put /ns-allinone.../bin into your PATH Regards /Sven Mohadig Rousstia wrote: dear all I have a problem, which is perhaps simple, but that is really consuming my all. So please help me regarding crating the environment. I have made this: export PATH=$PATH:/cygdrive/c/cygwin/ns-allinone-2.29/bin:/cygdrive/c/cygwin/ns-allinone-2.29/tcl8.4.11/unix:/cygdrive/c/cygwin/ns-allinone-2.29/tk8.4.11/unix export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/cygdrive/c/cygwin/ns-allinone-2.29/otcl-1.11:/cygdrive/c/cygwin/ns-allinone-2.29/lib export TCL_LIBRARY=$TCL_LIBRARY:/cygdrive/c/cygwin/ns-allinone-2.29/tcl8.4.11/library and also any kind of slight modification from the FAQ(still didnt work), since that was not working. I have tried to put it in(home directory) bashrc, bash_profile and also in(etc directory) bash, chsrc, profile. And also any combination of those and combination script above. That is really consuming time and my patience. perhaps anybody can help me, please. Thank you Best Regards Mohadig Widha R - How low will we go? Check out Yahoo! Messenger’s low PC-to-Phone call rates.
[ns] Web traffic simulator that can allow multiple client to one server
Hi guys, I was just wondering if I can get an HTTP traffic application simulator (like packmime) but that can send can allow one web server to server multiple clients. Presently, packmime do not support this, it only allows a one-to-one client/server config. Any suggestion will be appreciated. Also, when analysin http traffic, what are the permance metrics to watch out for, apart from bandwidth consumption and latency? Lekkie.
Re: [ns] Web traffic simulator that can allow multiple client to one server
Hi, lekkie
I'm sending you a script with a web server, a cache server and a router that
connects them with the point of entrance for 30 (=clients_num) clients.
In surveying the http (actually is tcp) traffic, you can calculate
bandwidth (be careful about the difference between B and throughput), delay,
jitter, number of dropped packets (important), etc.
Best of luck!
set ns [new Simulator]
set nf [open tcpweb.nam w]
$ns namtrace-all $nf
set allchan [open all.tr.tcp w]
$ns trace-all $allchan
proc finish {} {
global ns nf allchan
$ns flush-trace
close $nf
close $allchan
exec nam tcpweb.nam
exit 0}
set clients_num 30
for {set i 1} {$i = $clients_num} {incr i} {
set peer($i) [$ns node]
}
set jurancon [$ns node]
set lrmon3 [$ns node]
set lmcrt0 [$ns node]
set lmcrt1 [$ns node]
set jacob2 [$ns node]
#legarea nodurilor si a serverelor de fisiere
for {set i 1} {$i = $clients_num} {incr i} {
$ns duplex-link $peer($i) $jurancon .5Mb 30ms DropTail
}
$ns duplex-link $jurancon $lrmon3 .5Mb 30ms DropTail
$ns duplex-link $lrmon3 $lmcrt0 .5Mb 30ms DropTail
$ns duplex-link $lrmon3 $lmcrt1 .5Mb 30ms DropTail
$ns duplex-link $lmcrt0 $jacob2 .5Mb 30ms DropTail
$ns duplex-link $lmcrt0 $lmcrt1 .5Mb 30ms DropTail
set server [new Http/Server $ns $jacob2]
for {set i 1} {$i = $clients_num} {incr i} {
set client($i) [new Http/Client $ns $peer($i)]
}
set cache [new Http/Cache $ns $lmcrt1]
# Create page pool as a central page generator. Use PagePool/Math
set pgp [new PagePool/Math]
set tmp [new RandomVariable/Constant]
$tmp set val_ 4096 ## average page size;
$pgp ranvar-size $tmp
set tmp [new RandomVariable/Exponential]
$tmp set avg_ 6 ## average page age;
$pgp ranvar-age $tmp
$server set-page-generator $pgp
set tmp [new RandomVariable/Exponential]
$tmp set avg_ 0.5 ## average request interval;
for {set i 1} {$i = $clients_num} {incr i} {
$client($i) set-interval-generator $tmp
$client($i) set-page-generator $pgp
}
# Schedule events
set startTime 1
set finishTime 9
$ns at $startTime start-connection
$ns at $finishTime finish
$ns at 10 finish2
proc start-connection {} {
global ns server cache client clients_num
for {set i 1} {$i = $clients_num} {incr i} {
$client($i) connect $cache
$cache connect $server
$client($i) start-session $cache $server}
}
proc finish2 {} {
global ns log
$ns flush-trace
flush $log
close $log}
$ns run
lekkie omotayo [EMAIL PROTECTED] wrote:
Hi guys,
I was just wondering if I can get an HTTP traffic application simulator
(like packmime) but that can send can allow one web server to server
multiple clients. Presently, packmime do not support this, it only allows a
one-to-one client/server config.
Any suggestion will be appreciated. Also, when analysin http traffic, what
are the permance metrics to watch out for, apart from bandwidth consumption
and latency?
Lekkie.
-
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[ns] code for the integration of wlan/umts
Hi everyone, I was reading so many articles of the integration WLAN/UMTS which include some ns simulation results and I have been searching for ns code but I didnt found any so if anyone has codes for such integration I would like to know it will be very helpful. So Im waiting for anybody help, Thank you in advance. _ Dont just search. Find. Check out the new MSN Search! http://search.msn.click-url.com/go/onm00200636ave/direct/01/
[ns] Emulation Error - Ping Responder, help needed!
Hi everyone,
I am a newbie with NS2 and trying to use nse to run a simple ping responder
script on a Linux machine but I get the following error message:
pcap/live object (_o11) couldn't open packet source fxp0: socket: Operation not
permitted
(_o11 cmd line 1)
invoked from within
_o11 cmd open readonly fxp0
invoked from within
catch $self cmd $args ret
invoked from within
if [catch $self cmd $args ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error error when calling class $cls: $args $...
(procedure _o11 line 2)
(SplitObject unknown line 2)
invoked from within
$bpf open readonly fxp0
(file emu1.tcl line 8)
The script is one made by Kevin Fall shown below:
set stoptime 200.0 ; # simulation end time (seconds)
set owdelay 1000ms ; # 1-way delay
set myaddr 10.11.12.13
set ns [new Simulator] ; # create simulator object
$ns use-scheduler RealTime ; # specify the real-time sync?d scheduler
set bpf [new Network/Pcap/Live]; # live traffic -- read IP pkts
$bpf set promisc_ true ; # use promiscuous mode
$bpf open readonly fxp0 ; # specify interface
set ipnet [new Network/IP] ; # live traffic -- write IP pkts
$ipnet open writeonly
$bpf filter icmp and dst $myaddr; # only ICMP packets for me
set pfa [new Agent/Tap]
set ipa [new Agent/Tap]
set echoagent [new Agent/PingResponder]
$pfa network $bpf ; # associate pf net object w/tap agent
$ipa network $ipnet ; # associate ip net object w/tap agent
# create topology in simulator
set node0 [$ns node]
set node1 [$ns node]
set node2 [$ns node]
$ns simplex-link $node0 $node2 100Mb $owdelay DropTail
$ns simplex-link $node2 $node1 100Mb $owdelay DropTail
# place agents in topology
$ns attach-agent $node0 $pfa; # packet filter agent
$ns attach-agent $node1 $ipa; # ip agent (for sending)
$ns attach-agent $node2 $echoagent
$ns simplex-connect $pfa $echoagent
$ns simplex-connect $echoagent $ipa
puts listening for pings on addr $myaddr...
$ns run ; # start emulation
Does anyone know what the problem is?
Thanks,
Vincent Ngo
This mail sent through www.mywaterloo.ca
[ns] Emulation Basic Hardware Requirements
Hi all, I have been trying to blindly run sample emulation scripts using nse without fully understanding the requirements needed to run them. If I were to run a simple ping responder what requirements and steps would I need? ie. I have a Linux machine connected to a LAN. How many network cards do I need in it? When I run an emulation script, do I need to go to another machine and manually ping the emulation machine and see if packets are displayed in the NAM? Do other machines need to be involved in the emulation and have ns2 installed and running simultaneously? Any input is greatly appreciated, Vincent Ngo This mail sent through www.mywaterloo.ca
Re: [ns] Emulation Basic Hardware Requirements
emulation or simulation? On 8/15/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Hi all, I have been trying to blindly run sample emulation scripts using nse without fully understanding the requirements needed to run them. If I were to run a simple ping responder what requirements and steps would I need? ie. I have a Linux machine connected to a LAN. How many network cards do I need in it? When I run an emulation script, do I need to go to another machine and manually ping the emulation machine and see if packets are displayed in the NAM? Do other machines need to be involved in the emulation and have ns2 installed and running simultaneously? Any input is greatly appreciated, Vincent Ngo This mail sent through www.mywaterloo.ca -- Renata Vidal Triste é o destino de quem tenta vencer as batalhas e ter sucesso nos ataques sem cultivar o espírito da iniciativa (A Arte da Guerra – SUN TSU – pg 102)
[ns] Determining nodes along multihop path
Hello, I was wondering if there was a way to determine through what path of nodes a packet takes. I'm looking at my trace file using AODV for my wireless ad-hoc network sim, and can't seem to see but a send and receive line for each individual packet. There is no indication of through what nodes a packet traveled. Any help would be greatly appreciated. Thanks, Arnab
[ns] Determine if there is connectivity in wireless
Is there way to determine if there is connectivity in a wireless simulation
because I want to do somethink similar to:
while(!network_up()) { //waiting}
ggeorgak
[ns] How to access my new ad hoc routing agent from the simulation script.tcl
Hello Melvin and all ns users, Normally, the specification of the ad hoc routing protocol(AODV for example) which will be used by the mobiles nodes during simulation is like follow: In tcl script ,where our scenario of simulation is described ,we do tow thinks: First- In node options we do: set val(rp) AODV Second- In node configuration we do: $ns_ node-config - adhocRouting $$val(rp)\ If my new protocol is called XYZ. it is right if I replace aodv by XYZ in the first or there is more of things to add in the tcl script. Any help would be greatly appreciated. Regards, Wissam.
[ns] Fwd: RED parameters
-- Forwarded message -- From: Bruno Correa [EMAIL PROTECTED] Date: 15/08/2006 19:27 Subject: RED parameters To: ns-users@isi.edu Hi, I am new user of the ns. I am have problem with RED parameters, i set my buffer for 100 packets, maxth for 95 packets and minth to 30 packtes in file ns-default.tcl. But, my queue don't exceeds 50 packets. When the queue arrives the 51 packets, the RED starts the drop of the packets Why?
Re: [ns] Emulation Basic Hardware Requirements
It is for Emulation Renata Vidal wrote: emulation or simulation? On 8/15/06, [EMAIL PROTECTED] [EMAIL PROTECTED] wrote: Hi all, I have been trying to blindly run sample emulation scripts using nse without fully understanding the requirements needed to run them. If I were to run a simple ping responder what requirements and steps would I need? ie. I have a Linux machine connected to a LAN. How many network cards do I need in it? When I run an emulation script, do I need to go to another machine and manually ping the emulation machine and see if packets are displayed in the NAM? Do other machines need to be involved in the emulation and have ns2 installed and running simultaneously? Any input is greatly appreciated, Vincent Ngo This mail sent through www.mywaterloo.ca -- Renata Vidal Triste é o destino de quem tenta vencer as batalhas e ter sucesso nos ataques sem cultivar o espírito da iniciativa (A Arte da Guerra – SUN TSU – pg 102) -- View this message in context: http://www.nabble.com/Emulation-Basic-Hardware-Requirements-tf2111395.html#a5824272 Sent from the ns-users forum at Nabble.com.
[ns] Size's queue in RED
Hi, I am new user of the ns. I am have problem with RED parameters, i set my buffer for 100 packets, maxth for 95 packets and minth to 30 packtes in file ns-default.tcl. But, my queue don't exceeds 50 packets. When the queue arrives the 51 packets, the RED starts the drop of the packets Why?
[ns] energy model problem for mac tdma protocol for sensor networks
I am working mac tdma protocol for sensor networks iam currently using ns-2.27,i need eenrgy details of evry node, problem iam facing is that for ns2.27 enrgy model doesnt work for mac tdma protocl the energy doesnot reduce after transmission or reception for every node, it remains same as initial energy i googled it and found that for ns 2.27 cmutrace.ccdoesnt give enrgy details where as ns 2.29 is working perfectly as its cmutrace.cc is updated ,but iam not able to use ns-2.29 bcoz sensornetworls extension is available only up to ns 2.27 can anybody help me solve this problem i either want do make ns 2.27 give energy details for mac tdma or want NRLsensorsim 2.29 to extend ns 2.29for sensor netwoks. the due date for my project is approaching i want a solution as soon as possible . c u all . hope to get some replies.
