How to Start Hping3 SYN Flood Attack Projects Using NS2

To simulate an Hping3 SYN Flood Attack using NS2 (Network Simulator 2), follow this guide. SYN flooding is a form of Denial of Service (DoS) attack which exploits the three-way handshake through transferring a large number of SYN packets for overcome the goal.

Steps to Simulate SYN Flood Attack in NS2:

  1. Understand SYN Flooding
  • Attack Mechanism: The attacker transmits the numerous SYN packets for server nevertheless does not comprehensive the handshake, triggering the server for assign the resources for half-open connections.
  • Objective: Overload the victim and follow on the network’s performance degradation.
  1. Set Up NS2 Environment
  • Install NS2:

sudo apt-get install ns2

  • Verify with a sample script:

ns example.tcl

  1. Install Hping3 (Optional)
  • Hping3 is a network tool which builds a TCP/IP packet and can replicate the SYN flooding.
  • Install Hping3 for validate the real-world environment alongside NS2:

sudo apt-get install hping3

  1. Define Network Topology
  • Build a TCL script in NS2 for replicate the attacker, victim, and legitimate nodes.
  • Example topology:
    • Attacker node creates the SYN flood.
    • Victim node receives SYN packets.
    • Legitimate nodes transfer the normal congestion.
  1. TCL Script for SYN Flood

Under is an sample NS2 TCL script for a SYN flood attack replication:

# Initialize the simulator

set ns [new Simulator]

set tracefile [open syn_flood.tr w]

$ns trace-all $tracefile

# Create nodes

set attacker [$ns node]

set victim [$ns node]

set legitimate [$ns node]

# Create links

$ns duplex-link $attacker $victim 1Mb 10ms DropTail

$ns duplex-link $legitimate $victim 1Mb 10ms DropTail

# Create TCP agent for legitimate traffic

set tcp_legit [new Agent/TCP]

$ns attach-agent $legitimate $tcp_legit

set sink_legit [new Agent/TCPSink]

$ns attach-agent $victim $sink_legit

$ns connect $tcp_legit $sink_legit

# Create UDP agent for SYN flood (simulate Hping3)

set udp_attack [new Agent/UDP]

$ns attach-agent $attacker $udp_attack

set null [new Agent/Null]

$ns attach-agent $victim $null

$ns connect $udp_attack $null

# Simulate legitimate traffic

set ftp [new Application/FTP]

$ftp attach-agent $tcp_legit

$ns at 1.0 “$ftp start”

# Simulate SYN flood attack

set cbr [new Application/Traffic/CBR]

$cbr set packetSize_ 40  # Small packets

$cbr set interval_ 0.001  # High-frequency SYN packets

$cbr attach-agent $udp_attack

$ns at 2.0 “$cbr start”

$ns at 5.0 “$cbr stop”

# End simulation

$ns at 6.0 “finish”

proc finish {} {

global ns tracefile

$ns flush-trace

close $tracefile

exit 0

}

$ns run

  1. Analyze Results
  • Trace File:
    • The trace file such as syn_flood.tr encompasses the specific packet information.
    • Filter SYN flood packets using:

grep “UDP” syn_flood.tr > syn_flood.log

  • Visualization:
    • Use the tool Gnuplot for envisions the throughput, latency, and packet loss.
  1. Optional Real-World Hping3 Simulation

We need for associate the outcomes in NS2 tool by a real-world environment:

  1. Use the tool as Hping3 for transmits the SYN packets.
  2. Sample for the command in Hping3 SYN flood:

hping3 -S –flood -V -p 80 <victim-ip>

  1. Simulate Defense Mechanisms

To make the project more comprehensive, implement countermeasures like:

  • Firewall Rules: The rules are stopped the excessive SYN requests.
  • Rate Limiting: The frequencies are limiting the SYN packets.
  • Intrusion Detection System (IDS): Tracking and attack traffic is blocked.

Example countermeasure in TCL:

set firewall [new Firewall]

$firewall set threshold_ 1000

$firewall attach-agent $victim

Tools and Resources

  • Wireshark: Examine the congestion build through NS2 for improved insights.
  • Gnuplot: Envision for effect of attack.
  • Hping3: It replicates the SYN floods outside NS2.

From the above demonstration we all gain knowledge about how the Hping3 SYN Flood Attack project examples were executed in various scenarios using the ns2 simulation tool. For further inquiries about this project, a separate manual will be provided.