MPTCP don't create multiple subflows

That's it. I've installed it in one machine, and tested it in https://amiusingmptcp.com and gave positive. Now, when I do iperf -c multipath-tcp.org like they say here: http://multipath-tcp.org/pmwiki.php?n=Users.UseMPTCP I only see one connection:

root@user:~# netstat -m
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       Local Token Remote Token
mptcp      0 602616 streaming.local:47914   mptcp.info.ucl.ac.:5001 ESTABLISHED 2590462875  3979247341

and iperf shows the same, one connection:

root@user:~# iperf -c multipath-tcp.org
------------------------------------------------------------
Client connecting to multipath-tcp.org, TCP port 5001
TCP window size:  512 KByte (default)
------------------------------------------------------------
[  3] local 192.168.1.11 port 47914 connected with 130.104.230.45 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.3 sec  6.75 MBytes  5.48 Mbits/sec

What should I do more to divide the data between multiple subflows?

Thank you.