Typically application developers develop and testing team tests an web based application in a local area network (LAN). And, once everything is completed deployment of the application is done in a wide area network (WAN). This process carries lots of WAN related bugs to the application. This is due to LAN having higher bandwidth (for example, 100 Mbps), lesser delay (~1 ms), almost zero loss, corruption and reordering of packets as compared to WAN. WANem[8] is used to provide real experience of a WAN during application development or testing over LAN environment. Thus, WANem helps both application developers and testers by emulating WAN in a LAN. Next Generation WANem (NxGen WANem) is developed based on existing WANem with enhanced features. With more interactive GUI and modifications on some preexisting commands, the NxGen WANem provides user with facility to model and design a network by dragging the network components available in the interface designed and thereafter emulate the network characteristics. In this paper, we propose an architecture of NxGen WANem. Keywords: Emulation, LAN, WAN, WANem, SWT, GWT, JSP, AJAX