I have a 10MB/1MB connection. Whenever my sister uses her computer my connection speed drops from 10MB to 500KB! I believe she is using some sort of P2P software, and uploading uncontrollably. I cannot think of any solution other than possibly setting up QoS? I have installed tomato firmware on my linksys WRT54GL for this reason. I have enabled QoS and listed the SRC MAC address of her computer and set the priority to lowest. However this is not helping at all. I do not know what I am doing wrong. Can QoS limit upload speed as well? Please someone advice. I have tried searching and reading all over, but cannot find any direct information.