Can RM520 support L4s explicit congestion marking?

IoT Modules 5G Module
1

I’m starting to see support for L4S in mobile networks. Can we take advantage of it?

Can the RM520 support the ECN marking as described RFC 9331 - The Explicit Congestion Notification (ECN) Protocol for Low Latency, Low Loss, and Scalable Throughput (L4S) ?
a) if I send a packet with ECT(1) will the marking be forwarded to the network?
b) if the RM520 needs to queue an ECT(1) marked packet, will it add the CE marking ?

Thanks.

Tim.

2

Dear @steely-glint
Which module did you use?RM520N-GL or RM520N-EU?

3

@silvia hi,

I’ve got the global variant.

RM520NGLAA-M20-SGASA
Running
RM520NGLAAR03A03M4G

Thanks.
Tim.

4

Dear @steely-glint
It depends on kernal version.

You can enable ECN tcp mask by command below and try.

sysctl net.ipv4.tcp_ecn=1
Currently, this feature didn’t test on our side.