ABSTRACT
At present, the user community widely employs three main free
software network emulators:
• Dummynet • NIST Net • NetEm
All of these three emulators are of production quality. They are
available in operating systems that are extensively used for research,
such as Linux and FreeBSD. In addition to being used directly,
these emulators are also integrated into testbed-based network
emulators. For example, Emulab reportedly uses Dummynet on its
FreeBSD nodes and NetEm on its Linux nodes [108].