}

	// Also check the method for the older kernels if not tested before
	if hasSOLMPTCP && !isUsingMPTCPProto(tcp.fd) {
		ch <- errors.New("incoming connection is not an MPTCP proto")
		return
	}
}

func dialerMPTCP(t *testing.T, addr string, envVar bool) {
	d := &Dialer{}

	if envVar {
		if !d.MultipathTCP() {
			t.Fatal("MultipathTCP Dialer is not on despite GODEBUG=multipathtcp=1")
		}
	} else {
		if d.MultipathTCP() {