Aukru ® USB 2.0 Adapter 10-100 Mbps Ethernet LAN - Cord RJ45 - Compatible with Mac / Linux / Win XP-VISTA-SEVEN-8 - USB 2.0 to Fast Ethernet adapt (White) (Electronics)
Recognized directly under linux, what easily add a 2nd interface to a banana or raspberry pi Not tested in terms of speed / consumption