The goal of our project is to develop a general traffic client node with "smart" packet switching mechanism by merging IPv6 and the Asynchronous Transfer Mode (ATM) as the protocol for the QoS enabled Internet. By examining the "Type Of Service" field in the IPv6 packets, the general traffic client can channel different QoS packets onto the appropriate PVC/SVC which has matching QoS parameters. The IPv6 and ATM cell co-switching mechanism implemented by the general traffic client preserves the connectionless feature for non-realtime applications and provide the QoS for realtime applications through merging the IPv6 and ATM protocols. The application of Type Of Service on congestion control algorithm (such as establishing SVC dynamically in case of high QoS traffic experiences congestion) will also be examined in the course of the project if time permitted. The Opnet standard ATM model, in particular the raw packets over ATM model, will be employed as the starting point for our project.