這個功能 需要核心編譯時就得包含 USBNET (Multi-purpose USB Networking Framework) CDCEther (Communications Device Class Ethernet) 還有網路卡驅動
查看原廠編譯設定shinano_leo_defconfig CONFIG_USB_USBNET=y # CONFIG_USB_NET_CDCETHER is not set CONFIG_USB_NET_CDC_EEM=y # CONFIG_USB_NET_CDC_NCM is not set CONFIG_USB_NET_DM9601=y CONFIG_USB_NET_SMSC75XX=y CONFIG_USB_NET_SMSC95XX=y CONFIG_USB_NET_GL620A=y # CONFIG_USB_NET_NET1080 is not set CONFIG_USB_NET_PLUSB=y CONFIG_USB_NET_MCS7830=y # CONFIG_USB_NET_CDC_SUBSET is not set # CONFIG_USB_NET_ZAURUS is not set CONFIG_USB_NET_CX82310_ETH=y CONFIG_USB_NET_KALMIA=y CONFIG_USB_NET_INT51X1=y CONFIG_USB_SIERRA_NET=y