hello & uploads troubles

Hello,

i am a french user using lw since a week or so. I downloaded files already with sucess http://www.gnutellaforums.com/images/smilies/super.gif. I used two ways : my neigbourgh network through my laptop wifi (relax guys, my neigbourg agrees that) and my own dsl on my imac. The trouble is that quite many people are downloading the files i put in a sharable folder in the wifi manner (althrough it is quite slow or uncertain), and on the other hand i cannot see any transfer from my imac althrough the dsl is far more faster and demands for files in great number :is that due to an unknown trick from leopard's firewall ? http://www.gnutellaforums.com/images/smilies/frown.gif ?
Please answer me. I don't want to be considered as an asymetrical partner !