MPTCP Connection Check

Multipath TCP or MPTCP is an extension to the standard TCP and is described in RFC 8684. It allows a device to make use of multiple interfaces at once to send and receive TCP packets over a single MPTCP connection. MPTCP can aggregate the bandwidth of multiple interfaces or prefer the one with the lowest latency, it also allows a fail-over if one path is down, and the traffic is seamlessly reinjected on other paths.

For more informations, visit mptcp.dev

cURL

With cURL on Linux, you can easily check the status of your connection. Simply use the following command:
mptcpize run curl https://check.mptcp.dev/

The response is limited to the status message., e.g.:
You are not using MPTCP!

Static files

You can download files of various sizes from the files directory, for additional tests using MPTCP.