Comment Re:ipfw/dummynet (Score 1) 60
This was my thinking.
It's been ages since I've used ipfw as a WAN simulator, but my memory of it is normally around a fairly static kind of configuration of latencies and bandwidth.
Simulating a cellular link that might hop between LTE and 1x kinds of data might be tough to do without some kind of engine which dynamically reprograms dummynets for vastly different bandwidth/latency scenarios to better simulate a node moving between 1x and LTE speeds. When I built a WAN simulator, I did to actually simulate known WAN link performance parameters.such as bandwidth and latency. I didn't have to worry about my link switching from multilink T1s to 512K frame relay to 56k dynamically.
They could have also provided a ton of statistical profile data so that the simulations closely mirrored real-world throughput associated with various media, especially common variability patterns.
A nice GUI front-end would be useful too, with actual throughput measured.