Ravanayana: What if Ravana won?

April 21, 2013

What if Ravan had won instead of Ram? What do you people think of it? I think it would have been altogether a different story ...

Women's contribution to the Internet!

August 18, 2012

Whenever we talk of Internet history, big names like Alan Turing, Tommy Flowers and Harold Keen are mentioned who were working at Bletchley Park during the World War II helping to break the encrypted messages used by the German military. However, I couldn’t help but ask myself, “What were the women doing while the men were out inventing the Internet?”

Eat Street Bangalore

August 13, 2012

Undoubtedly a big time foodie, I was starving yesterday night and wanted to have some good food during the weekends (mess food on Saturday nights are really bad). So I thought of exploring some nearby food joints when a friend suggested about the less known 'eat street' (more popularly known as VV puram) in Bangalore.

The Joy of Giving

July 21, 2012

Today when volunteering for "help the needy" initiative by IISc, I was reminded of the wonderful experience I had as a volunteer for the "Notebook Drive" whose objective is providing notebooks, stationery etc. to poor students who otherwise have to drop out of their schools simply because in course of filling their stomachs, they fall short of money to buy notebooks.

Wednesday, May 8, 2013

NS2 simulator : common fixes Part 1

As I am trying to learn NS2 using the online tutorials, most examples given online are using older versions of NS. I am using NS 2.35 in which many syntax and/or file locations have changed. So I am finding my way out to figure how to fix those common errors popping up when trying those demos.

 Will keep updating the page as I keep learning ... :)

 Prob 1. On running the multicasting example ex-mcast.tcl on nile.wpi.edu/NS/ it first gave a warning saying:

 " Warning dst_ is no longer being supported in NS. dst_ 0xffffffff 
Use dst_addr_ and dst_port_ instead "

Fix: 

step 1: Replace "set mrthandle [$ns mrtproto DM {}] #DM = dense mode" with
             set mproto DM
             set mrthandle [$ns mrtproto $mproto {}]

step 2: Create groups for multicasting by adding the following after the above 2 lines:
            set group1 [Node allocaddr]
            set group2 [Node allocaddr]

step 3: Replace dest_ with dest_addr_ and replace the hexadecimal addresses with the group names you want the node to belong to. eg.
            $udp0 set dst_addr_ $group1
            $udp2 set dst_addr_ $group2

 Prob 2: invalid command name "Mac/Csma/Cd" or "Mac/Csma/Ca"

 Fix: Replace Mac/Csma/Cd or Mac/Csma/Ca with Mac/802_3

Prob 3: Segmentation fault when trying to use "namtrace-all-wireless"

Fix: In your script you have to change ifq value Queue/DropTail/PriQueue by CMUPriQueue