Explanation of protocols in ns-2.35

Network Simulator-2

network simulator-2 is an efficient and open source tool freely available for research community. NS-2 provides support for wired and wireless networks' simulation. In wireless simulation, we mainly focus on MANETs, i.e Mobile Adhoc Networks. As a part of MANET protocols, NS-2 consists of AODV, DSDV, and DSR etc. Other than the common binding architecture in NS package, all protocols have their different functioning and architecture. Understanding of those is also a tough task for a newbie of NS-2. So In this post I am trying to give an overview of these protocols for better understanding for those who want to work on any of these protocols.

AODV:

AODV code in NS-2.35: There is a aodv folder in ns-2.35 directory, which consists of the main coding of all the functioning of aodv. The files in aodv folder includes aodv.cc, aodv.h, aodv_logs.cc, aodv_packet.h, aodv_rtable.cc, aodv_rtable.h, aodv_rqueue.cc, aodv_rqueue.h. For every .cc file there is an entry in Makefile which integrates the whole ns package. Running of those makes .o file for corresponding .cc file.

aodv.cc is the main file which has binding with tcl. It configures the aodv property on every node of MANET where aodv is called, then corresponding functions like route discovery etc are called according to the need of simulation script. aodv protocol consists of various type of times as hellotimer, broadcasttime, neighborTimer, routecacheTimer etc.

There is corresponding entry in cmu-trace.cc file in trace folder which traces all events when protocol is aodv and sends the result trace data to the trace file for analysis after simulation.

There is wide range of extension possibility in code of AODV including, security extension in AODV, trust implementation in AODV, Attack detection and prevention in AODV, use of genetic algorithms to select best path in AODV, and many more...

This post will be extended soon...