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When the refresh command is issued, instead of trying to replace all NTP sources as if they were unreachable or falsetickers, keep using the current address if it is still returned by the resolver for the name. This avoids unnecessary loss of measurements and switching to potentially unreachable addresses.
This is a collection of simulation tests using the clknetsim simulator (supported on Linux only). https://github.com/mlichvar/clknetsim The CLKNETSIM_PATH environment variable should point to the directory where clknetsim was downloaded and compiled. If the variable is not set, the tests will look for clknetsim in ./clknetsim in the current directory. The tests are written in bash and they can be run directly. The ./run script runs all tests.