IMUNES

A realistic network topology emulation/simulation framework based on the FreeBSD and Linux operating system kernel partitioned into multiple lightweight virtual nodes, which can be interconnected via kernel-level links to form arbitrarily complex network topologies.

Main advantages:

Real time IP network topology emulation/simulation at Gigabit speeds
100s to 1000s of virtual nodes on one physical machine, each node capable of running unmodified UNIX applications
Scalable architecture for real-time large scale experiments
GUI: management plane, automated node, and link creation and configuration
Lightweight, portable experiments which can be quickly and easily instantiated
FreeBSD kernel-level network stack virtualization technology developed at the University of Zagreb
Open source and free