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When separate client and server instances of chronyd are running on one computer (e.g. for security or performance reasons) and are synchronized to each other, the server instance provides a reference ID based on the local address used for synchronization of its NTP clock, which breaks detection of synchronization loops for its own clients. Add a "copy" option to specify that the server and client are closely related, no loop can form between them, and the client should assume the reference ID and stratum of the server to fix detection of loops between the server and clients of the client.
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.