My Reply to this Problem is to tell the deverlopers of the Gnutella-software like limeware that the update hers software with this feature:
Every start of the Gnutella Client, the program must changed automatically the listing incoming port to an another randomized port like 25468 or 80 or each other port until 65536 for instance.
With the same manner must work all Gnutella Clients around the net.
if the hostlist (Gnutella.NET) is update, you can see many hosts with different kinds of Port.
I hope it is manageable.
Sorry about my english. I come from Germany. :-)
Email:
chatcafe@firemail.de