PIWIK does not register WAN visits but yes LAN visits (no replies)

Hello: I have a Synology DS213j installed in my home. I installed Piwik but only records visits made from my home intranet (192.168.xx) but it does not record visits made from outside, ie, from WAN.
I have my domain (enriqueizquierdo.com) redirected to my WAN IP address.
Can anyone help me?