Broadband with USB

Hi, I have established without problems a connection to NTL with both Linux and Windows by using the ethernet interface (eth0). However, when I try to establish a connection by using the USB interface, I succeed only from Window My old Linux 7.3 has plug in support for USB, but does not recognise the NTL connection. I guess that I should probably define manually an interface, but I do not know how to do it. Can somebody help me ? Thank you and best regards Mario Pesce