[2021] Use Dummynet to explore space, QUIC! - Tom Jones

The Internet has grown vastly in the last 24 years, connection speeds have grown from tens of kilobits a second up to hundreds of gigabits and we have changed our core protocols from plain text to actively protecting privacy. Our connection technologies have changed wildly too, no longer can we assume that a user connecting is using a dial up modem over wet string, instead links vary from wildly from 3G to gigabit FTTP hookups to geostationary orbits and out to satellite whizzing around just above the ISS. The software we develop and the network protocols we use need to be designed to take into account this wide of link technologies. To do this we can still use FreeBSD’s old faithfully network emulator, Dummynet. Dummynet has been core to evaluating the satellite performance of the absolute latest Internet protocol, QUIC. This talk will provide and introduction to Dummynet and how it can be used to emulate satellite links, 4G/5G links and others, and the role it can have in the futu