All connections no longer work

All my computers in the same network can no longer communicate with each other e.g. ping /ssh etc does not work.
At the beginning there were 5 systems in the same network which worked without any problems!
It beginns thath I could no longer communicate from my Macbook and then from my Linux PC and now all!
Have already tested everything possible (restart, new installations) without success.
The Status of the Network is: OK PRIVATE

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