https://www.freebsd.org/cgi/man.cgi?dummynet https://www.freebsd.org/cgi/man.cgi?dummynet The dummynet system facility permits the control of traffic going thr

https://www.freebsd.org/cgi/man.cgi?dummynet https://www.freebsd.org/cgi/man.cgi?dummynet The dummynet system facility permits the control of traffic going through the various network interfaces, by applying bandwidth and queue size limitations, implementing different scheduling and queue management policies, and emulating delays and losses. ... The dummynet facility was initially implemented as a testing tool for TCP congestion control by Luigi Rizzo, as described on ACM Computer Communication Review, Jan.97 issue.