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Thanks for your comment

You are right - I mixed MIDI Clock and time base information. ... but I found (and resolved) another obstacle.

On most distributions spoofing prevention is enabled. The sysctl configuration for net.ipv4.conf.all.rp_filter is enabled in the one I am using.

One has to add a route to the source address to the interface or to disable spoofing prevention.
I did the latter - I have a totally disconnected network.