[GSoC 2026] Flent Application API Integration - Week 3 Update
KEDAR KISAN
Hi everyone,
Here is a brief progress update for Week 3 of the Flent Application API Integration project.
1. Cross-Release Compatibility Testing I tested the Flent test suite against historical ns-3 releases to ensure backward compatibility. The suite passes cleanly on versions 3.36 through 3.39. For ns-3.40 and ns-3.41, I observed a slight drop in TCP Upload throughput (from ~44 Mbps to 41.4 Mbps), which caused the hardcoded test bounds to fail. We have not yet confirmed the root cause of this throughput drop, and investigating it is a priority for next week.
2. DSCP/ToS Marking for RRUL Return Traffic Since TCP ACKs returning from the server were not carrying the correct DSCP priority markings in the RRUL test, I Implemented a Tos attribute specifically within the PacketSink application. This allows us to explicitly set the ToS for the server's listening socket, ensuring all returning ACKs are correctly tagged according to their respective traffic classes.
You can view the full details and weekly breakdown of the project using the below Project links:
- Repository: https://gitlab.com/k.kedar/ns-3-dev (Working Branch: GSoC-2026 flent-application, nlohmann-json).
ns-3 wiki: https://www.nsnam.org/wiki/GSOC2026Flent
GSoC Page: https://summerofcode.withgoogle.com/programs/2026/projects/PCXPdFoD