Is it possible, to create an x86-ISO on a Linux-Machine?

Surely this will be possible, but I want to do some modifications to it  
beforehand.
So my problem is to modify the mfsroot.

Currently I can't mount it after unzipping it, so I suspect, it is a  
fileformat,
only common in BSD, right?

Or did I miss something else?

Anyone had success, creating the mfsroot on Linux, and burning it to CD  
afterwards?

As it seems, I need this, to test the OpenVPN-Module.

Greetings, Jan



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