How to Implement Network Access Control in NS2

To implement the Network Access Control (NAC) within NS2, we will require to follow the structured method that includes making a simulation situation in which various network access the control mechanisms are replicated. It can be contained mechanisms such as authentication, authorization, and accounting for network traffic. Now, we provide systematic process to execute the NAC within NS2:

Step-by-Step Implementation:

  1. Set up NS2
  • Make sure NS2 installed on the machine. We can install NS2 on Linux using the below commands:

sudo apt-get update

sudo apt-get install ns2

  1. Understand Network Access Control (NAC) Mechanism

NAC make certain that only authorized users and devices can access the network. General elements to mimic include:

  • Authentication: Make sure that only authorized users/devices can access the network.
  • Authorization: Give permissions to particular users/devices rely on policies.
  • Traffic Filtering: We can use the firewalls or ACLs (Access Control Lists) to block or permit the particular kinds of traffic.
  1. Modify NS2 TCL Script
  • NS2 simulations are normally written within Tcl scripts. To execute NAC, we will make or alter a new Tcl script, which replicates the various network access control policies.

Example snippet for basic traffic filtering using NAC:

set ns [new Simulator]

# Create network nodes

set node1 [$ns node]

set node2 [$ns node]

# Define a link between the nodes

$ns duplex-link $node1 $node2 1Mb 10ms DropTail

# Define Network Access Control policies (filter traffic here)

Agent/UDP set class_ 1 ;# Define UDP traffic class

$node1 filter set policy “deny all”; # Basic policy to block all traffic

# Add authentication mechanism (dummy example)

set auth_method “password”

if { $auth_method == “password” } {

puts “Authentication successful: Node access granted”

} else {

puts “Authentication failed: Access denied”

}

# Create traffic sources

set udp0 [new Agent/UDP]

$ns attach-agent $node1 $udp0

set cbr0 [new Application/Traffic/CBR]

$cbr0 set packetSize_ 500

$cbr0 set interval_ 0.05

$cbr0 attach-agent $udp0

# Simulation start

$ns at 0.5 “$cbr0 start”

$ns at 5.0 “finish”

  1. Simulate NAC Policies
  • Authentication: We can make a dummy authentication approaches in the script to replicate how authentication performs. For instance, users or devices will be allowed access if they pass the authentication (password, certificate-based, etc.).
  • Traffic Filtering: Execute access control lists (ACLs) to allow or block particular traffic types among the nodes. It can be done by setting filter policies on the nodes within NS2.
  • Authorization: Describe policies for particular nodes or users to access specific services, like HTTP, DNS, or custom services.
  1. Add Traffic Sources
  • We require to append the traffic sources to generate network traffic. This traffic will be exposed to the NAC policies we have executed.
  • Instances are contain TCP, UDP, CBR (Constant Bit Rate) traffic.
  1. Run the Simulation

After modifying the Tcl script then run the simulation in NS2 by implementing:

ns your_script.tcl

  1. Analyze Results

When the simulation is done, we can estimate the network behaviour using the trace files generated by NS2. We can envision the outcomes using tools such as NAM (Network Animator) or process the trace file for data analysis.

  1. Extend Functionality

If we need to execute more furthered NAC features such as role-based access control (RBAC) or incorporating firewall rules, we can expand the script by adding:

  • Stateful firewall rules.
  • User or role-based policies.
  • Logging access violations for unauthorized access.

From the above guide, we had discussed on how to approach and execute the Network Access Control within NS2 virtual environment utilizing the brief method. We will distribute more details concerning this topic in upcoming material.

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