[strongSwan] Virtual IPs range - but clients get the same one - problem

[lejeczek]

hi guys

a novice here with most likely "regular" question: roadwariors get all 
the same single IP, why?

Snippet of the server side:

    dpdaction=clear
    dpddelay=300s
    rekey=no
    left=%any
    leftfirewall=yes
    leftsubnet=10.3.1.0/24
    #leftsubnet=0.0.0.0/0
    leftcert="vpnserver.cert.der"
    right=%any
    rightdns=10.3.1.99
    rightdomain="mydom.local"
    #rightsourceip=10.3.1.0/24
    rightsourceip=10.3.1.220-10.3.1.225
    #rightsourceip=%dhcp
    auto=add

and clients':

  leftsourceip=%config
  leftcert="my.cert.der"
  leftfirewall=yes

And all, well, two, three clients I connect (at the same time) get the 
same 10.3.1.220 IP, why?

many thanks, L.