I know it's possible to connect a computer to a wireless adapter via ethernet and/or USB, likewise for the Raspberry Pi. Is it possible to connect my (Ubuntu) laptop to my Raspberry Pi via a double male USB cable and make them talk like it's an ethernet cable? Also, obviously, if it's possible how do I do it? I've been trying to find an answer and I'm having no luck. Thanks in advance :)
I used to use RNDIS drivers for that purpose, but there are better alternatives available today: http://www.linux-usb.org/usbnet/
Usbnet support is supposed to be included in the latest kernels.
If device mode did work, then you could use the gadget drivers such as g_ether, which would make the model A appear as a USB ethernet device when connected to a PC with a double male cable.