Simulating router- and domain characteristics

This paper describes the architecture and implementa-tion of a hybrid ns2 based network simulator. The system uses a generic xml description for the simulation jobs and uses the Java Messaging System to communicate with com-ponents like a graphical front-end or a toolkit for a visual-ization of the results. The hybrid simulator is an extension of standard ns2, which supports the representation of au-tonomous systems by delay and loss models and provides a more complex node behavior by adding support for for-warding or processing delays within ns2 nodes. An xml scheme has been developed to describe autonomous sys-tems.