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    "For this I want to use no external hardware or switch." You cannot do this on any system period, if you mean you want to use a plain USB cable for the connection. USB is not a symmetrical relationship. You can in fact physically damage either machine by connecting them this way, since there is voltage involved. Commented Apr 12, 2015 at 10:18
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    You can, however, use a special host-to-host cable, in which case, yes there are kernel drivers, so if you are going to buy one, make sure you check around whether there are drivers for that particular cable. Commented Apr 12, 2015 at 10:28
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    That will definitely not work, and is the kind of cable that can fry your computer if you connect it to another computer directly. Commented Apr 12, 2015 at 10:36
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    @Thorongil No, that is not what I mean. It looks like there are not any on that Amazon site that I could find -- they are kind of unusual things. Here's one. Do not confuse this with an OTG ("on-the-go") cable, which are much more common. Basically this is just not worth pursuing -- notice that is a 2.0 cable meaning you would have faster transfers using an ethernet cable if they both have gigabit ethernet (and you could use normal software). Commented Apr 12, 2015 at 10:55
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    i just do networking ... my computers so i know i already have it ... a LAN-over-USB to LAN-over-USB would what i would look for Commented Apr 12, 2015 at 12:10