Latest clknetsim now allows source and destination port numbers to
differ. This fixes the tests to work with the recent changes that added
client NTP sockets.
Use clknetsim to run multiple chronyd instances with simulated clocks
and network. It allows fast and reproducible testing, without real
network.
Included are several tests of performance in different clock/network
conditions, chronyd options, NTP authentication, chronyc, and past bug
fixes.