Iperf UDP not working

[Raquel1L]

Expected Behavior

I want to evaluate the performance of the network, in the uplink scenario, from my laptop to a Google Cloud VM (where the openMPTCProuter VPS is installed) using an RPI 4 (where the openMPTCProuter router is installed) as a router.

To do this, I ran the Iperf UDP client on the laptop and the iperf server on the VM and, in parallel, did a tcpdump on the VM. So the idea is to generate traffic from the laptop to the VM.

In short, the command I ran on the laptop was: iperf -c -u -b 5M -t 10

and on the GC VM I ran iperf -s -u sudo tcpdump -i any -w packets.pcap port 5001

What I expected to see in the capture I made was only the MPTCP protocol.

Current Behavior

However, the capture shows UDP packets, which means that MPTCP didn't encapsulate the traffic coming from iperf UDP, as I thought it would.

What could be wrong for this to happen? How can I get MPTCP to work with Iperf?

Note that MPTCP is working on other ports, not related to iperf.

And the system status is all alright

Specifications

• OpenMPTCProuter version: v0.59.1
• OpenMPTCProuter VPS version: 0.1028
• OpenMPTCProuter VPS provider: GCP
• OpenMPTCProuter platform: RPI4

[Ysurac]

MPTCP is only for TCP, to aggregate UDP a TCP VPN is used. Server IP have a direct route from the router so direct UDP traffic between router and server is not aggregated (UDP traffic from client use the VPN, so is aggregated).

[Raquel1L]

Thank you very much for your reply!

I've used Iperf with TCP, and the VM's packet capture shows only TCP packets. Shouldn't it be showing MPTCP?

This time, the command I ran on the laptop was: iperf -c -p 59990 -b 5M -t 10

and on the GC VM I ran iperf -s -p 59990 sudo tcpdump -i any -w packets.pcap

So, my other questions are: How can I use iperf from a laptop to the VM with MPTCP working as expected? Which ports should I use?

[github-actions[bot]]

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 5 days