ns3-gym + RL-TCP failing on ns-3.40

[Aejaz]

Hello,

I’m trying to run an RL-TCP example (agent_test.py) using ns-3.40 with OpenGym / ns3-gym on Ubuntu 24.04 (Python 3.10).

• OpenGym is placed under ns-3.40/contrib/opengym

• ns-3 builds successfully and detects OpenGym

• Python side fails at runtime (import / env handshake issues)

• RL-TCP code depends on ns3-gym, which appears unmaintained

• Newer guidance suggests Gymnasium, but RL-TCP is tightly coupled to old ns3-gym APIs

Questions:

1. Is ns3-gym actually compatible with ns-3.40 + Python ≥ 3.10?

2. What is the last known working ns-3 version for ns3-gym + RL-TCP?

3. Is there a maintained alternative or fork, or is downgrading the only realistic option?

I want to know clearly whether this setup is fixable or fundamentally broken due to version drift.

Thanks,
Aejaz

[압둘하미드이드리스]

Use 'trial and error' method.

Also check if you can run any other examples.

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Idris Adedamola Abdulhameed, M.Sc.
Ph.D. Candidate, School of Computer Science and Engineering, Kyungpook National University | Lecturer II (on Study Leave), The Polytechnic, Ibadan, Nigeria

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