Why does qemu use tun0 instead of tap0 like VDE? Shouldn't qemu be using ethernet frames instead of IP frames?

Qemu already does. Like VDE, qemu uses a tap device (not a tun device) but the kernel allows you to create a tap device with the name "tun0" (and conversely, a tun device with the name "tap0"). Qemu just uses confusing names, but it always uses a tap device - and thus, it always uses ethernet frames.

Q: When I run qemu, the mouse doesn't work. I set everything else right, and everything else works, but the mouse doesn't. The mouse pointer is either not there, frozen, or hidden in the bottom right corner of the screen.

I am using SDL-1.2.8 with qemu. A: Try doing "SDL_VIDEO_X11_DGAMOUSE=0 qemu parameters", or doing "export SDL_VIDEO_X11_DGAMOUSE=0" or "setenv SDL_VIDEO_X11_DGAMOUSE 0" (depending on if you use the bash shell or the C shell) before running qemu. More.

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