Sure. We [0] make APIs for live video and audio, so we do a lot of different kinds of network testing. Over time, we had cobbled together a variety of tools to support load/scaling testing, CI/CD, testing during development, and helping our customers debug and test their applications. For all of these, some ability to simulate packet loss, latency, jitter, and other network realities is somewhere between helpful and critical.

I'm a big fan of Snabb, and had a few conversations with Max Rottenkolber, one of the Snabb authors, about how we might tackle building a common network-simulation framework that we could use across all the different kinds of testing we do. Max suggested more or less the approach that you can see in the synthetic-network repo. (He wrote a series of documents during implementation that are really fun reading. They are in the /doc directory.)

Since we increasingly use Rust in various places, and our use case was a bit different than the core use cases for Snabb, Max took a swing at porting parts of Snabb to Rust for the synthetic-network project. That worked out really well, and that Snabb-implemented-in-Rust is now Rush!

[0] https://www.daily.co/