How can I run a Windows program without granting it any Internet access? So I have CrossOver on Linux, but since this is basically the project with which I also help the Wine folks and virtually all of the fundamentals are applicable to both, I am asking under wine. Is it possible to start a Windows program under Wine in such a way that it has no access to the Internet at all? So far I have come up empty-handed when it came to this. I was thinking about writing my own shared object in order to tinker around by way of `LD_PRELOAD` but that sort of thing is anyway off-topic here. Is there any way from a pure user perspective to achieve what I want? Could kernel namespaces be used for this in any way?

You could unshare the network namespace:


sudo unshare -n -- su your_user -c your_command