[SOLVED] [RTL8151] Ethernet not working via multiport adapter

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Made some progress. In ChromeOS, there is a usb-modeswitching program called MIST (“Modem Interface Switching Tool”).

In the udev rules of mist, there are the following lines relating to Realtek 815x:

# The following devices are Ethernet adapters in USB Storage mode.

ATTRS{idVendor}=="04e8", ATTRS{idProduct}=="a100", ATTR{bInterfaceClass}=="08", GOTO="mist_switch_device"

ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="8151", ATTR{bInterfaceClass}=="08", GOTO="mist_switch_device"

ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="8152", ATTR{bInterfaceClass}=="08", GOTO="mist_switch_device"

ATTRS{idVendor}=="13b1", ATTRS{idProduct}=="0040", ATTR{bInterfaceClass}=="08", GOTO="mist_switch_device"

In MIST’s default.conf, more infomation could be found:

###############################################################################
# The following devices are Ethernet adapters, not cellular modems.
###############################################################################

# Samsung USB Ethernet Adapter AA-AE2N12B
usb_modem_info {
  initial_usb_id { vendor_id: 0x04e8 product_id: 0xa100 }
  final_usb_id { vendor_id: 0x04e8 product_id: 0xa101 }
  initial_reset: true
}

# Realtek RTL8152-based Ethernet Adapters
usb_modem_info {
  initial_usb_id { vendor_id: 0x0bda product_id: 0x8151 }
  final_usb_id { vendor_id: 0x0bda product_id: 0x8152 }
  usb_message: "555342430860d9a9c0000000800006e0000000000000000000000000000000"
}

# Realtek RTL8153-based Ethernet Adapters
usb_modem_info {
  initial_usb_id { vendor_id: 0x0bda product_id: 0x8152 }
  final_usb_id { vendor_id: 0x0bda product_id: 0x8153 }
  usb_message: "555342430860d9a9c0000000800006e0000000000000000000000000000000"
}

It seems that the product ID switches to 0152 after modeswitch. I will try to figure out a working usb-modeswitch command and report here.

Anyway, any help will be greatly appreciated.