Skip to main content

ROUTING TABLE GENERATION

 We all know that there was no automatic provisioning to generate a routing table for the nodes  in ns2. One of the way to solve this is by analyzing trace file generated by using some high level scripts like awk script, perl script or some other scripts.But it is little complex and also we have good knowledge in that and another way is to generating routing table is by modifying the existing routing protocol.


Here, we are going to generate routing tables for tcl scripts by modifying AODV protocol. For that we have to modify following files in the AODV directory[for AODV directory look at ns2.35 folder];
  1. aodv.h 
  2. aodv.cc

1. aodv.h modification

First display aodv.h file and then add the following lines inside the class AODV in the protected scope Add the line after the rt_down() function.

void rt_print(nsaddr_t nodeid);




Save the aodv.h file and

2. aodv.cc modification

Now click on aodv.cc file and select display option,

Now add the following function rt_print to the aodv.cc file probably below rt_down function.

void  AODV::rt_print(nsaddr_t nodeid) {
FILE *fp;
fp = fopen("route_table.txt", "a");
aodv_rt_entry *rt;
for (rt=rtable.head();rt; rt = rt->rt_link.le_next) {
fprintf(fp, "NODE: %i \t %f \t %i \t %i \n", nodeid, CURRENT_TIME, rt->rt_dst, rt->rt_nexthop);
}
fclose(fp);
}


















This function records the routing table entry into the file route_table.txt

The above code ;
  1. Creates a file pointer under append mode.
  2. Creates a pointer to routing table entry.
  3. Process the queue and finally print the values to the file with file pointer fp.
  4. Close the file pointer.

Now finally we have to call the function that we written above,we can call it in any part of protocol. Here we are going to call inside recvReply() function.

For that we have to write following line inside if (ih->daddr() == index);

 rt_print(index);



After completing these steps.Open the terminal window and change the directory to the ns2.35 by using following command.

cd /home/user/Desktop/ns-allinone-2.35/ns-2.35 [change path as yours]

and now type 
                                                                     make clean 
then type
                                                                         make
then type
                                                               sudo make install
  
         

























After successful completion of steps.Run a sample program.
For AODV,Click here
For sample program,click here  and run the program using command ns filename.tcl

Screen shot of a routing table



Note: File route_table.txt will be saved in the directory where program is located

This post is taken and modified from www.elmurod.net and www.nsnam.com
Labels:

Comments

Post a Comment

Popular posts from this blog

Link State Routing Protocol

Link state routing is a method in which each router shares its neighborhood’s knowledge with every other router on the internetwork. In this algorithm, each router in the network understands the network topology and then makes a routing table depending on this topology. Each router will share data about its connection to its neighbor, who will, consecutively, reproduce the data to its neighbors, etc. This appears just before all routers have constructed a topology of the network. In LSP, each node transmits its IP address and the MAC to its neighbor with its signature. Neighbors determine the signature and maintain a record of the combining IP address and the MAC. The Neighbor Lookup Protocol (NLP) of LSP derives and maintains the MAC and IP address of every network frame accepted by a node. The extracted data can support the mapping of MACs and IP addresses. The link-state flooding algorithm prevents the general issues of broadcast in the existence of loops by having every node mainta
Post a Comment
Read more

Windows 11

Windows has always existed to be a stage for the world’s innovation. It’s been the backbone of global businesses and where scrappy startups became household names. The web was born and grew up on Windows. It’s the place where many of us wrote our first email, played our first PC game and wrote our first line of code. Windows is the place people go to create, to connect, to learn and to achieve – a platform over a billion people today rely on. The responsibility of designing for that many people is one we don’t take lightly. The past 18 months brought an incredible shift in how we used our PCs; we went from fitting the PC into our lives to trying to fit our whole lives into the PC. Our devices weren’t just where we went for meetings, classes and to get things done, but where we came to play games with friends, binge watch our favorite shows and, perhaps most meaningfully, connect with one another. In the process we found ourselves recreating the office banter, the hallway chatter, worko
Post a Comment
Read more

Matter: A next generation home standard

The smart home is evolving. To date, if you've wanted to get into developing a smart home, you've had to deal with the multitude of smart home ecosystems, and making sure that each device you buy is compatible. That, however, may soon change — thanks to new smart home standard called Matter. Matter isn't available just yet, but when it is finally released, it could completely change how you buy smart home products, for the better. All of the best smart home devices could soon support the standard, helping them all work together nicely, and ensuring that no matter what products you buy, you'll be able to use them. Matter is basically the name of a new smart home connectivity standard . But this standard is a little unlike others. That's because of the fact that it's being developed by the Connectivity Standards Alliance, which counts hundreds of companies as members. That includes the likes of Google, Alexa, and Apple. So, whether you prefer to use Google Assista
1 comment
Read more