What is Modem RAS (Remote Access Service) and NDIS (Network Interface Card) Modes
RAS – Remote Access Service.
NDIS – Network Driver Interface Specification.
RAS (modem) mode should be selected, If you just want to make a connection to the Internet using your 3G USB modem,
NDIS mode should be selected, if you are planning to connect to Wi-Fi network or organizing ADSL-connection.