Duplicating a data packet transfer on a path in ns2 while modifying the AOMDV protocol requires a combination of approaches:
1. Understanding the Modification:
Identify the specific change you're making: What aspect of AOMDV are you modifying (e.g., route selection, error handling)? This will guide your approach for duplicating the packet.
Determine the need for duplicate packets: Is it necessary to send two identical packets to observe the effect of your modification? Or is it sufficient to analyze individual packet behavior?
2. Packet Duplication Methods:
a) Modifying AOMDV Code:
Inject duplicate packets at the source: If your modification affects how packets are sent, you can directly modify the AOMDV source code to inject a duplicate packet before the original one. However, this requires careful coding and debugging to avoid unintended consequences.
Create a custom agent: Develop a separate agent that intercepts packets sent by AOMDV and duplicates them before forwarding them further. This approach offers more flexibility but requires additional coding effort.
b) Utilizing ns2 Features:
Tcl scripting: Use Tcl scripts to intercept packets at specific points in the network and duplicate them. This approach offers flexibility but might be less efficient for large-scale simulations.
Trace files: Run the simulation once with unmodified AOMDV and capture the packet trace. Then, modify the trace file to create a duplicate packet and re-run the simulation with the modified trace. This is simpler but might be less flexible for complex modifications.
3. Additional Considerations:
Purpose of duplication: Clearly define the purpose of duplicating packets to ensure you choose the most appropriate method.
Impact on simulation performance: Duplicating packets can increase simulation time and resource usage. Be mindful of this impact and optimize your approach if necessary.
Validation: Verify that your chosen method accurately duplicates packets and aligns with your research goals.
Remember, modifying ns2 source code requires caution and understanding of the underlying protocols. Consider consulting online resources, tutorials, and forums for specific guidance and examples related to AOMDV modifications and packet duplication in ns2.