Abstract
A network emulator enables real hosts to interact via a virtual network. It combines a real-time network simulator with a mechanism to capture packets from and write packets to a real network. Packets generated by external hosts interact with synthetic traffic within the virtual network, providing a controlled environment for testing real Internet applications. This paper focuses on two aspects related to the scalability of network emulators. The scalability of the virtual network run within the emulator and the scalability of the number of external hosts that can interact via the emulator concurrently. For the scalability of the virtual network, parallel discrete event simulation (PDES) techniques can be employed. The scalability of the number of external hosts requires handling varying amounts of network I/O and mapping packets into the simulator efficiently. These issues are discussed in terms of work being done on the Internet Protocol Traffic and Network Emulator (IP-TNE) developed at the University of Calgary.
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