ah ok...
thanks for the general info, im sure that other people visiting will find it helpful...
now , for my specific situation... well, to be honest im living with housemates which suck up the line with file sharing, through a router that i bought, and they make life very unpleasant for me if i block their file sharing ports... however, they did agree to pay for another line , because i will configure 2 routers to distribute the internet access between us... a 512k line that will be for file sharing, it can be as heavily throttled as necessary and nobody will notice , because theres the 1mbit line that we currently have , which will be used for normal internet browsing... i have all the hardware, and i already have a new telephone line, and me and my housemates are simply waiting for a new internet connection
the one condition of that 512k line that i want, is that there are absolutely no blocks on it, every connection attempt to every port inbound and outbound should suceed, sans the line itself being overloaded... it will keep my housemates happy , because they are using emule and it depends on the ports being responsive etc etc... it will give them an illusion of a high-performance connection, when in reality it is not so...