The question is not clear !!!! General Rule dude in order to get the right answers you need to ask the right questions... "Both are connected through telephone line via Modem ." Yeah Right.... In order to get connected the modem does handshaking with the ISP and you get an available IP address that your ISP allots so if you are connecting to PSTN you will get an IP whether you like it or NOt then There is a list of cached ip etc etc ... you keep on getting repeatedly so pl z make your question clear ... If you are asking about virtual private networks...????
