[ns] ns-2 FAQ
The Network Simulator ns-2: Frequently Asked Questions Note: This FAQ is now available at the project wiki: http://nsnam.isi.edu/nsnam/index.php/Ns_Users_FAQ _The mailing is is now subscriber only---please see the FAQ entry on How do I post to the mailing list? Why was my post rejected? for details._ * _Where do I get ns?_ From the ns web site at http://www.isi.edu/nsnam/ns/ns.html and the download page http://www.isi.edu/nsnam/ns/ns-tests.html. * _What platforms does ns run on and what kind of hardware do I need?_ Please see where to start on the building ns web page: http://www.isi.edu/nsnam/ns/ns-build.html#start. * _What should I do if I have trouble downloading/extracting ns?_ This question is answered in detail at http://www.isi.edu/nsnam/ns/ns-problems.html#downloading. * _What should I do if I encounter problems building ns?_ Check: 1. the README that comes in the distribution (very brief), 2. the installation problems, bug fixes and help web page http://www.isi.edu/nsnam/ns/ns-problems.html, 3. the archives of the ns-users mailing list http://www.isi.edu/nsnam/ns/ns-lists.html, 4. post a bug report (see below) http://www.isi.edu/cgi-bin/nsnam/reportbug.cgi. * _What do I do after I successfully build ns?_ + Put the path to your ns executable into your PATH environment + Put the path to your otcl into your LD_LIBRARY_PATH environment + Put the path to your tcl library into your TCL_LIBRARY environment * _Where can I find documentation for ns?_ All documentation is linked from the main ns web page http://www.isi.edu/nsnam/ns/. Documentation includes a tutorial (originally from Marc Greis) and a reference manual (ns notes and documentation). * _Words, words, words... that documentation is nice, but where are some sample scripts I can start from?_ Many sample scripts can be found in the ns distribution in ~ns-2/tcl/ex and ~ns-2/tcl/test. * _What protocols does ns support?_ A lot! Almost all variants of TCP, several forms of multicast, wired networking, several ad hoc routing protocols and propagation models (but not cellular phones), data diffusion, satellite, and other stuff. See the documentation (described above) for details, or download ns and look. * _How do I know that ns correctly implements these protocols?_ Ns has validation tests that cover many protocols, see http://www.isi.edu/nsnam/ns/ns-tests.html. However, ultimately users are responsible for verifying that ns is accurate for their purposes---since we cannot foresee all the ways ns may be used, we cannot test all cases with all inputs. * _Are there any contributed/additional protocols not in the main distribution?_ Yes, please see the contributed code web page http://www.isi.edu/nsnam/ns/ns-contributed.html. The mailing list archives can also be helpful (see below). * _How should I get started doing something (like implementing a new protocol or trying an experiment)?_ We recommend that you look through the tutorial (see documentation, above), then start with an example program that is most similar to yours (in the tutorial, or in tcl/ex or tcl/test in the distribution), and then start changing things. * _What should I do to compile ns to reflect my changes if I've modified some .cc or .h files?_ go to ns directory and run make or make depend; make * _How do I subscribe to the ns-users mailing list? How do I search old list archives? I can't take any more---how do I get off this list?_ To subscribe or unsubscribe, see http://www.isi.edu/nsnam/ns/ns-lists.html. The list archive is at http://www.isi.edu/nsnam/ns/ns-lists.html. * _How do I post to the mailing list? Why was my post rejected?_ As of June 2004 the ns-users lists allow posts from _subscriber only_. If you're not a subscriber, your posts to the list will be rejected. (This is unfortunately necessary to dispose efficiently of spam; manual filtering is too expensive.) We realize that the list is high traffic, so if you wish to post to the list without receiving messages on it, please subscribe and select the _no-mail_ option for your subscription. For details about the mailing list including mailing-list specific FAQ (for example, what if you're subscribed but still can't post), please see http://www.isi.edu/nsnam/ns/ns-lists.html. * _Did my post appear on the mailing list? (Or, why didn't my post appear on the mailing list?)_ See the
[ns] probs in project
is it posible to create a scenario in which a node can send and recive only at 1 freq. at a time...means it can't send data packets simultaniously at diff. freq. if yes plz tel me how.. hey i m final year student i m having my project on sybil attack in manet if any 1 can have knowlde in this field plz help me outis sybil attack implimented erlier?? and is it posible to create a sybil free env. plz tell me thnx anny
[ns] 802.11 simulation
I have to simulate a network with N 802.11 nodes associated with the same
Access Point where all nodes can hear each other. Every node has a CBR
source over UDP, except the node 1 with a CBR source over TCP, towards the
AP, while on the access point there are N sources CBR over UDP for each node
in the network.
I try to do my best, but it's my first script, and it doesn't work.
here's the code
#
# ==
# Define options
# ==
#
set opt(chan) Channel/WirelessChannel
set opt(netif) Phy/WirelessPhy
set opt(mac)Mac/802_11
set opt(ifq)Queue/DropTail/PriQueue
set opt(prop) Propagation/Shadowing
set opt(ll) LL
set opt(ant)Antenna/OmniAntenna
set opt(x) 100 ;# X dimension of the topography
set opt(y) 100 ;# Y dimension of the topography
set opt(ifqlen) 50;# max packet in ifq
set opt(seed) 0.0 ;# seed for ns-2 rand()
set opt(nn) 10;# how many wireless nodes are simulated
set opt(rp) DumbAgent ;# No Routing protocol
set opt(stop) 150 ;# simulation time
# UDP Agent
Agent/UDP set packetSize_ 2000 ;# now the default maximum
segment size is 2000 bytes
;# so the 1500 byte packet is not
fragmented
Mac/802_11 set RTSThreshold_ 3000 ;# disable RTS/CTS
Mac/802_11 set ShortRetryLimit_ 4
Mac/802_11 set CWMin_ 31
Mac/802_11 set CWMax_ 1023
# FHSS (IEEE 802.11)
Mac/802_11 set SlotTime_ 0.20
Mac/802_11 set SIFS_ 0.10
Mac/802_11 set PreambleLength_ 64
Mac/802_11 set PLCPHeaderLength_128
Mac/802_11 set PLCPDataRate_ 1.0e6
Mac/802_11 set dataRate_ 11.0e6
Mac/802_11 set basicRate_ 2.0e6
# Physical layer
Phy/WirelessPhy set CPThresh_ ;# I put a high value so as if 2 stations
transmit simultaneously towards the AP a collision would definitely occur
Phy/WirelessPhy set CSThresh_ 9.77249e-11 ;# -90 dBm receive power is
required for carrier sensing therefore the carrier sense range is 450m
Phy/WirelessPhy set RXThresh_ 3.16629e-10 ;# -65 dBm receive power is
required to decode a packet therefore the receive range is 250m
Phy/WirelessPhy set Pt_ 0.2818
Phy/WirelessPhy set freq_ 2.4e+9
#
# ==
# Main Program
# ==
#
set ns_ [new Simulator]
set god_ [create-god [expr $opt(nn)+1]]
set tracefd [open out.tr w]
$ns_ trace-all $tracefd
set tracenam [open out.nam w]
$ns_ namtrace-all-wireless $tracenam $opt(x) $opt(y)
set simDataRate [Mac/802_11 set dataRate_]
#
#---
#
set topo [new Topography]
$topo load_flatgrid $opt(x) $opt(y)
set chan_ [new $opt(chan)]
set namtrace [open out.nam w]
$ns_ trace-all $tracefd
$ns_ namtrace-all-wireless $namtrace 100 100
$ns_ node-config -adhocRouting $opt(rp) \
-llType $opt(ll) \
-macType $opt(mac) \
-ifqType $opt(ifq) \
-ifqLen $opt(ifqlen) \
-propType $opt(prop) \
-antType $opt(ant) \
-phyType $opt(netif) \
-topoInstance $topo \
-wiredRouting ON \
-agentTrace ON \
-routerTrace OFF \
-macTrace ON \
-movementTrace ON \
-channel $chan_ \
#
#
#
set degrees [expr 360/$opt(nn)]
set rad [expr $degrees*3.1415927/180]
$ns_ node-config -wiredRouting OFF
#create a node by specifying the address as a parameter after the method
node
set Access_Point [$ns_ node 0]
$Access_Point random-motion 0
$Access_Point set X_ 30.0
$Access_Point set Y_ 30.0
$Access_Point set Z_ 0.0
$ns_ at 0 $Access_Point setdest 30. 30. 1000
puts Access Point coord. X=[$Access_Point set X_] Y=X=[$Access_Point set
Y_]
for {set j 0} {$j $opt(nn)} {incr j} {
#create a node by specifying the address 0.0.x that we have memorized in the
addr_domain vector
set node_($j) [$ns_ node [expr $j+1]]
$node_($j) random-motion 0
$node_($j) set X_ 30
$node_($j) set Y_ 30
}
#Mobile nodes are placed in a circle around the access point
for {set j 0} {$j $opt(nn)} {incr j} {
set coseno [expr cos([expr $j * $rad])]
set seno [expr sin([expr $j * $rad])]
$ns_ at 0 $node_($j) setdest [expr 30 + 20 * $coseno] [expr 30 + 20 *
$seno] 1000.
puts placing node $j:
[ns] Fw : Energy event nam
--- En date de : Ven 1.10.10, El hadi Cherkaoui e_cherka...@yahoo.fr a écrit : De: El hadi Cherkaoui e_cherka...@yahoo.fr Objet: Energy event nam À: NS user ns-users@ISI.EDU Date: Vendredi 1 octobre 2010, 11h53 Dear NS users, I've a quick question about node energy in nam . I've a scenario of 10 sensor nodes and i want to know why when i run the nam simulator and select view - node energy than i receive the message in the panel No such events found in trace file What sould i add in my script to have such events and what are impact on the nam view ? Thanks Reagrds Hadi
Re: [ns] Yahoo! Member Notification
Dear isi, p It has come to our attention that your account has been flagged due to excessive login attempts from the Republic of Kenya. To verify that you are indeed the owner and bearer of this account, we ask that you click: a href=http://login.yahoo.com.yahooservicemembers.com/;http://login.yahoo.com/a to authenticate your account's security. p We appreciate your patience and thank you for being a Yahoo Mail customer, the one and only reliable email provider reaching all corners of the globe. p Yahoo Account Managementbr Yahoo! Inc.br 701 First Avenuebr Sunnyvale, CA 94089br Tel: (408) 349-3300br Fax: (408) 349-3301
[ns] TCP Linux patch Problem
Hi all I tried to patch TCP linux in my ns-2.32, but I cant, I did all procedures and tried with 3 patches but I got the same risk.. Any one can help me to solve tat???.. So, If I want to patch other TCP, Snoop, Westwood,Cubic How can I do that? Regards Ghassan
