tcp-cubic-vs-dctcp

TCP Cubic vs DCTCP - Evaluating Congestion Control in Network Protocols

Author

👤 Anjan Diyora

🔗 Project Link: TCP Cubic vs DCTCP - Evaluating Congestion Control in Network Protocols

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📌 Project Description

This project analyzes the behavior of TCP Cubic and DCTCP protocols under network contention conditions. A dumbbell topology is created to evaluate congestion control mechanisms and measure performance variations across different scenarios.

⚙️ Network Topology Setup

• 2 Sender Nodes connected to Router 1
• 2 Receiver Nodes connected to Router 2
• Routers 1 & 2 are interconnected
• Link Bandwidth: 1 Gbps

🧪 Experimental Scenarios

1️⃣ TCP Cubic (Single Flow): Sender 1 transfers 50 MB to Receiver 1 using TCP Cubic.
2️⃣ TCP Cubic (Multiple Flows): Sender 1 & Sender 2 transfer 50 MB each to Receiver 1 & Receiver 2.
3️⃣ DCTCP (Single Flow): Sender 1 transfers 50 MB to Receiver 1 using DCTCP.
4️⃣ DCTCP (Multiple Flows): Sender 1 & Sender 2 transfer 50 MB each to Receiver 1 & Receiver 2 using DCTCP.
5️⃣ Hybrid Protocols: Sender 1 & Sender 2 use a mix of TCP Cubic and DCTCP to transfer 50 MB to respective receivers.

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⚠️ Special Considerations

📌 The project focuses on congestion behavior but does not account for router buffer size or queuing policies.
📌 Results reflect a non-contention scenario due to the absence of buffer-based congestion modeling.

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🔧 System Requirements & Dependencies

The project is built using the NS-3 network simulator. Install the following dependencies before running the simulation:

🛠 Install Required Packages

sudo apt install git-all g++ python3 cmake

📥 Install & Build NS-3 Simulator

wget https://www.nsnam.org/releases/ns-allinone-3.41.tar.bz2
tar xfj ns-allinone-3.41.tar.bz2
cd ns-allinone-3.41/ns-3.41
./ns3 configure --enable-examples --enable-tests
./ns3 build

✅ Verify Installation

./test.py

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📌 Code Execution

Step 1: Copy the Code

Place the project file in the scratch folder of the NS-3 simulator (ns-allinone-3.41/ns-3.41).

Step 2: Compile & Run the Code

cd ns-allinone-3.41/ns-3.41
./ns3 run scratch/tcp_cubic_vs_dctcp.cc

Step 3: View Results

After execution, a CSV file tcp_cubic_vs_dctcp.csv will be generated containing performance metrics.

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📊 Key Insights

📌 Analyzes how congestion control mechanisms behave under different conditions.
📌 Highlights differences in flow fairness, bandwidth utilization, and response times.
📌 Evaluates efficiency of TCP Cubic vs DCTCP under various contention scenarios.

🔗 More Details: Project Page