I guess it has do to something with VirtualBox and not Debian itself.
And to prevent that I cannot reach my remote server anymore I test the settings in the VM first. My provider forces me to set a specific MAC address for every IP (I have several IPs and I want to use several). The background is that I want to test the network settings of my dedicated root server which hosts my websites (which has nothing to do with the VM or my local PC). Of course I'm aware of the fact that I can change the MAC address in the VM settings. I know that you now have the question why I want to change the MAC address from within Debian. What's working is the changing of the MAC address. I already googled for many hours and tried many things, it does not work. But "ifconfig", "ip addr show" and "ip route show" do not show any hints what's wrong.
When I change the MAC address within the Debian system, I do not have a working network connection to or from the VM anymore. I use the latest VirtualBox version under Windows 10 Home 圆4.
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