Network testbeds are an invaluable tool for conducting experiments with real hardware and software in a controlled and easily manageable environment. Typically, testbeds employ an emulation component to control the delay and bandwidth of experimental links. On most testbeds, the nodes are only a few milli-seconds away from each other and the link speed is either 100 or 1000Gbps. Such an arrangement is acceptable for LAN only experiments; however, networks, which have long distance links, experience much higher delays. For instance, networks with Geostationary Earth Orbit (GEO) satellite links can experience a delay of 125ms per hop. Additionally, networks with satellite links can have a significant variation of speed between the links. Hence, providing a variable delay and bandwidth is paramount, when conducting Wide Area Network (WAN) experiments.
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