Queuing Models in NS2

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M/M/1 is a system with poisson arrival time, servicing exponentially and a queue of unlimited capacity and type of FIFO Queue. This is the simplest queuing system.  NS2 supports various distributions like pareto, exponential, constant, unifrom, etc to handle the network dynamics and metrics. So it is very easy to test the given network link to monitor a given queue using any of these queuing models. The listing 3 and 4 are monitoring the link when DropTail queue is used with a capacity of finite and infinite. Listing 13.3 uses infinite capacity and Listing 13.4 uses Finite capacity The output screen shot is shown below the scripts for further understanding
Listing 3 – M/M/1 Queuing Model #new Simulator creation set ns [new Simulator] #trace file creation for capturing the UDP data set tf [open out.tr w] $ns trace-all $tf
#setting the exponential distribution param set lambda 30.0 set mu     33.0
#creation of nodes set n1 [$ns node] set n2 [$ns node] #The queue limit is 1Lakh as the capacity is infin…

Installing ns-2.29 in Ubuntu 12.04

Off late, we try to use(install) a old software in a new Operating System for want of backward compatibility or to survey.  This following post shows you how to install ns-2.29 in Ubuntu 12.04.

Unlike other ns2 installations, this installation has so many errors, warnings and patchings. Once everything is overcome, ns installs successfully

Step 1: Download and untar ns-2.29 from this link (http://sourceforge.net/projects/nsnam/files/allinone/ns-allinone-2.29/ns-allinone-2.29.3.tar.gz/download)

Step 2: install the necessary dependancy packages using the command "sudo apt-get install build-essential libxmu-dev autoconf automake" (without quotes). This will install the necessary developmental packages

Step 3: Since ns-2.29 is older software, some of the pointer conversion have to be changed inside ns-2.29

Step 4: go to terminal, point to the location of ns-allinone-2.29 using the command "cd ~/ns-allinone-2.29/" and type "./install"

Step 5: there may be the following errors during the installation, please correct one by one

1. OTcl-1.11 error make failed.

for this error, open the file under the folder otcl-1.11/configure.in and go to line number  

Change the following block to 

 Linux*)

        SHLIB_CFLAGS="-fpic"

        SHLIB_LD="ld -shared"

        SHLIB_SUFFIX=".so"

        DL_LIBS="-ldl"

        SHLD_FLAGS=""

        ;;

Linux*)
        SHLIB_CFLAGS="-fpic"
        SHLIB_LD="gcc -shared"
        SHLIB_SUFFIX=".so"
        DL_LIBS="-ldl"
        SHLD_FLAGS=""
        ;;
2. tclcl-1.17 error, in line number 566 of Tcl.cc file (~tclcl-1.17/Tcl.cc) (See the upper case Tcl.cc)
change the following to 
char *p = strchr(localName, '(');
this following line
char *p =const_cast<char*>( strchr(localName, '('));
3. there will be so many errors in the queue/ folder (~ns-allinone-2.29/ns-2.29/queue/), there may be some pointer conversion errors
Error 1:
------
queue/red.cc:877:41: error: invalid conversion from ‘const char*’ to ‘char*’
make: *** [queue/red.o] Error 1
In queue/red.cc at 874 line
Change the following to
 
if (((p = strstr(v->name(), "ave")) == NULL) &&
   ((p = strstr(v->name(), "prob")) == NULL) &&
   ((p = strstr(v->name(), "curq")) == NULL) &&
   ((p = strstr(v->name(), "cur_max_p"))==NULL) ) {
this 
if (((p = const_cast<char*>(strstr(v->name(), "ave"))) == NULL) &&
       ((p = const_cast<char*>(strstr(v->name(), "prob"))) == NULL) &&
        ((p = const_cast<char*>(strstr(v->name(), "curq"))) == NULL) &&
       ((p = const_cast<char*>(strstr(v->name(), "cur_max_p")))==NULL) ) {

Error 2:
queue/rio.cc:568:36: error: invalid conversion from ‘const char*’ to ‘char*’
queue/rio.cc:569:39: error: invalid conversion from ‘const char*’ to ‘char*’
queue/rio.cc:570:40: error: invalid conversion from ‘const char*’ to ‘char*’
queue/rio.cc:571:36: error: invalid conversion from ‘const char*’ to ‘char*’
make: *** [queue/rio.o] Error 1
 

in queue/rio.cc and in line number 565 
 find the following lines
if (((p = strstr(v->name(), "ave")) == NULL) &&
   ((p = strstr(v->name(), "in_ave")) == NULL) &&
   ((p = strstr(v->name(), "out_ave")) == NULL) &&
   ((p = strstr(v->name(), "prob")) == NULL) &&
   ((p = strstr(v->name(), "in_prob")) == NULL) &&
   ((p = strstr(v->name(), "out_prob")) == NULL) &&
   ((p = strstr(v->name(), "curq")) == NULL)) {

and replace these lines
if (((p = const_cast<char*>(strstr(v->name(), "ave"))) == NULL) &&
       ((p = const_cast<char*>(strstr(v->name(), "in_ave"))) == NULL) &&
        ((p = const_cast<char*>(strstr(v->name(), "out_ave"))) == NULL) &&
       ((p = const_cast<char*>(strstr(v->name(), "prob"))) == NULL) &&
        ((p = const_cast<char*>(strstr(v->name(), "in_prob"))) == NULL) &&
        ((p = const_cast<char*>(strstr(v->name(), "out_prob"))) == NULL) &&
        ((p = const_cast<char*>(strstr(v->name(), "curq"))) == NULL)) {
Error 3: 
queue/pi.cc:316:36: error: invalid conversion from ‘const char*’ to ‘char*’
queue/pi.cc:317:36: error: invalid conversion from ‘const char*’ to ‘char*’
make: *** [queue/pi.o] Error 1



in queue/pi.cc at line number 316
Find these lines and 
if (((p = strstr(v->name(), "prob")) == NULL) &&
    ((p = strstr(v->name(), "curq")) == NULL)) {
replace with these lines

 if (((p = const_cast<char*>(strstr(v->name(), "prob"))) == NULL) &&
        ((p = const_cast<char*>(strstr(v->name(), "curq"))) == NULL)) {

Error 4:
 
queue/vq.cc: In member function ‘virtual void Vq::trace(TracedVar*)’:
queue/vq.cc:333:35: error: invalid conversion from ‘const char*’ to ‘char*’
make: *** [queue/vq.o] Error 1
Find the following line and
if ((p = strstr(v->name(), "curq")) == NULL) {
replace this line
if ((p = const_cast<char*>(strstr(v->name(), "curq"))) == NULL) {

 
Error 5
queue/rem.cc:337:36: error: invalid conversion from ‘const char*’ to ‘char*’
queue/rem.cc:338:36: error: invalid conversion from ‘const char*’ to ‘char*’
make: *** [queue/rem.o] Error 1

In queue/rem.cc: in line number 336
Find the following lines and 
if (((p = strstr(v->name(), "ave")) == NULL) &&
    ((p = strstr(v->name(), "prob")) == NULL) &&
    ((p = strstr(v->name(), "curq")) == NULL)) {

replace these lines
if (((p =const_cast<char*>(strstr(v->name(), "ave"))) == NULL) &&
       ((p = const_cast<char*>(strstr(v->name(), "prob"))) == NULL) &&
       ((p = const_cast<char*>(strstr(v->name(), "curq"))) == NULL)) {


Error 6: 
queue/gk.cc:207:35: error: invalid conversion from ‘const char*’ to ‘char*’
make: *** [queue/gk.o] Error 1

In queue/gk.cc in line number 207
find the following line and 
if ((p = strstr(v->name(), "curq")) == NULL) {
 replace this line
if ((p = const_cast<char*>(strstr(v->name(), "curq"))) == NULL) {
Step 6: Once the errors are corrected, go back to ns-allinone-2.29 and press ./install and see whether the installation is successful
Step 7: Set the PATH information in /home/pradeep/.bashrc and  execute "source .bashrc"
Check whether ns and nam are working (for me nam was not working, Since mine is ubuntu I installed NAM separately using "sudo apt-get install nam"
Thats all!!!!.

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