Part 4 Adding a New Routing Protocol in Network simulator with idsAODV example
Before you begin
reading this post, I assume that you have already installed NS2 on Linux. I
have used version 2.34, which is current release. If you have not installed
yet, DOWNLOAD ns2.34 and
INSTALL. Okey, simple requirements to write your own routing protocol
- NS2 installed
- You should know how to program in C/C++.
- Optionally, shell scripting and perl.
Let's start with
creating directory of routing protocol.
Download and put idsaodv
folder in $NS_ROOT/
ns-2.34/".
(TO Download this file, You have to take a survey. Click on the Ace2three link or any other link and register yourself there and Activate that link. Mean while don't close that survey window popped. else mail me I will send them to you.)
I will not
explain the code here, and if you don't understand just leave comment I will
try to answer.
Now, we are going to
modify following files. Therefore it is better you backup these files before
you start adding new protocol, so that you can easily go back.
$NS_ROOT/Makefile
$NS_ROOT/queue/priqueue.cc
$NS_ROOT/common/packet.h
$NS_ROOT/trace/cmu-trace.h
$NS_ROOT/trace/cmu-trace.cc
$NS_ROOT/tcl/lib/ns-packet.tcl
$NS_ROOT/tcl/lib/ns-lib.tcl
$NS_ROOT/tcl/lib/ns-agent.tcl
$NS_ROOT/tcl/lib/ns-mobilenode.tcl
Let's start with
~/ns-allinone-2.34/ns-2.34/Makefile just add following lien at 269
idsaodv/idsaodv.o \
Add following lines to
~/ns-allinone-2.34/ns-2.34/queue/priqueue.cc from line 93.
// idsAODV patch
case PT_idsAODV:
To define new routing
protocol packet type we have to modify
~/ns-allinone-2.34/ns-2.34/common/packet.h file.
We change PT_NTYPE to
63, and for our protocol PT_idsAODV = 62.
If you have already
installed another routing protocol. Just make sure PT_NTYPE is last, and
protocol number is ordered sequentially. From line 85 changes would be :
// idsAODV packet
static const packet_t
PT_idsAODV = 62;
// insert new packet
types here
static packet_t
PT_NTYPE = 63; // This MUST be the LAST one
We make following code
change at line 254 of ~/ns-allinone-2.34/ns-2.34/common/packet.h.
The code is used that
the packet is routing protocol packet and has high priority.
type == PT_AODV ||
type == PT_idsAODV)
And at line 390 of the
same file
// idsAODV patch
name_[PT_idsAODV] =
"idsAODV";
Now we will modify tcl
files to create routing agent.
First we define
protocol name to use in tcl file.
It would done by
modifying ~/ns-allinone-2.34/ns-2.34/tcl/lib/ns-packet.tcl @ line 172
# idsAODV patch
idsAODV
Now we set routing
agent by modifying ~/ns-allinone-2.34/ns-2.34/tcl/lib/ns-lib.tcl @ line 633
idsAODV {
set ragent [$self
create-idsaodv-agent $node]
}
From line 860 of the
same file following code should be added.
Simulator instproc
create-idsaodv-agent { node } {
# Create idsAODV
routing agent
set ragent [new Agent/idsAODV
[$node node-addr]]
$self at 0.0
"$ragent start"
$node set ragent_
$ragent
return $ragent
}
Now we will set port
numbers of routing agent. sport is source port, dport is destination port.
Modify
~/ns-allinone-2.34/ns-2.34/tcl/lib/ns-agent.tcl line 202
Agent/idsAODV instproc
init args {
$self next $args
}
Agent/idsAODV set
sport_ 0
Agent/idsAODV set
dport_ 0
Frankly speaking I
have no idea why I have to add following things. But I believe it should be
done according to some tutorial :
~/ns-allinone-2.34/ns-2.34/tcl/lib/ns-mobilenode.tcl
line 201
# Special processing
for idsAODV
set idsaodvonly
[string first "idsAODV" [$agent info class]]
if {$idsaodvonly != -1
} {
$agent if-queue [$self
set ifq_(0)] ;# ifq between LL and MAC
}
We are done.
got to
~/ns-allinone-2.34/ns-2.34/ directory and do
make clean
make
If you face any difficulty please place comment. I will try level best to solve.
