Issue with ECN Marking in Experimental Network Configuration.

[Anjali-19]

Hi everyone,

I'm encountering an issue with obtaining a CE mark via a router. Below is the topology I'm utilizing for an experiment, where h1 and h2 serve as senders, h3 as the receiver, and there exists a bottleneck bandwidth of 10 mbps between routers r1 and r2, with a propagation delay of 10ms. Prague is being employed as a scalable congestion control from flow h1 to h3, while cubic serves as the classic congestion control from flow h2 to h3.

To facilitate the operation of Prague and dualpi2, I've incorporated the kernel tree from (https://github.com/L4STeam/linux) and installed iproute2 from (https://github.com/L4STeam/iproute2). Additionally, I'm conducting the experiment using Linux namespaces.

Here are the sysctl commands I've used to configure the experiment:

sysctl -w net.ipv4.tcp_congestion_control=prague (at h1) sysctl -w net.ipv4.tcp_congestion_control=cubic (at h2) sysctl -w net.ipv4.tcp_ecn=3 (enabled Accurate ECN at h1, r1, r2, and h3) sysctl -w net.ipv4.tcp_ecn=1 (classic ECN at h2) These are the parameters I've set for running the experiment:

limit: 10000 target: 15ms tupdate: 16ms alpha: 0.16 beta: 3.25 step.thresh: 1ms step.in_packets: false c_protection: 10% ecn_mask: 1 coupling_factor: 2 drop_overload: true drop_early: false split_gso: true

I'm using Wireshark to capture packets, but I'm not observing any ECN marking whereas I can see ECT(1) for scalable traffic and ECT(0) for classic traffic. Any assistance in resolving this issue would be greatly appreciated.

Thank you.

[minuscat]

This issue is closed after communication with Anjali directly in email