just a few updates.

- router config
with Belkin54g, go to the control panel and activate the UPnP utility. it allows server and clients to auto-accomodate settings for UPnP services (or something similar!)

- ports
if you have problems with ports (for ex., gnump3d tells "port 49152 already in use?") you have to switch down the executable which is using that port, the one we previously configured in Canola Configuration Panel (search up the thread). useful commands are:
netstat -ltp - lists port, connections and processes running, with their PID
kill PID - kills process with pid PID...
traceroute WEB_ADDRESS - is fun! try to run with www.internettablettalk.com, it will tell you how long it takes to exchange information from you IP to this server and back!

Back to our issue: retried after having switched UPnP utility on in the router.

so? nothing.