Hi Pinball_NL,
if you are directly or via a simple switch connected, you can always reach your ctrlX via the IPv6 Link-local address.
This can be calculated from the MAC address which you can find on the type plate.
Here is a link to a online calculator: https://nettools.club/mac2ipv6
Or you go to the network explorer of your windows, here you should see the ctrlX COREs in your network as well, you may have to enable the discovery function.
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