diff --git a/src/add-ons/kernel/drivers/network/usb_asix/ASIXVendorRequests.h b/src/add-ons/kernel/drivers/network/usb_asix/ASIXVendorRequests.h
index d383368a45..535a60216d 100644
--- a/src/add-ons/kernel/drivers/network/usb_asix/ASIXVendorRequests.h
+++ b/src/add-ons/kernel/drivers/network/usb_asix/ASIXVendorRequests.h
@@ -66,7 +66,11 @@ enum ASIXRXControl {
 	RXCTL_MULTICAST		= 0x0010,
 	RXCTL_AP			= 0x0020, // AX88772-178
 	RXCTL_START			= 0x0080,
-	RXCTL_USB_MFB		= 0x0100  // AX88772-178
+	RXCTL_USB_MFB_2048	= 0x0000, // AX88772-178
+	RXCTL_USB_MFB_4096	= 0x0100, // AX88772-178
+	RXCTL_USB_MFB_8192  = 0x0200, // AX88772-178
+	RXCTL_USB_MFB_MAX   = 0x0300, // aka 16384 + mask AX88772-178
+	RXCTL_LOOPBACK		= 0x1000, // AX88772A / AX88772B
 };
 
 
diff --git a/src/add-ons/kernel/drivers/network/usb_asix/AX88772Device.cpp b/src/add-ons/kernel/drivers/network/usb_asix/AX88772Device.cpp
index 8bb1e4b9a7..66dba422cd 100644
--- a/src/add-ons/kernel/drivers/network/usb_asix/AX88772Device.cpp
+++ b/src/add-ons/kernel/drivers/network/usb_asix/AX88772Device.cpp
@@ -157,9 +157,18 @@ enum AX88772_BBState {
 	LINK_STATE_MDINT	= 0x08
 };
 
+// RX Control Register bits (772B)
+enum ASIX772RXControl {
+	RXCTL_HDR_TYPE_0	= 0x0000,
+	RXCTL_HDR_TYPE_1	= 0x0100,
+	RXCTL_HDR_IPALIGN	= 0x0200,
+	RXCTL_ADD_CHKSUM	= 0x0400,
+};
+
 // EEPROM Map.
 enum AX88772B_EEPROM {
-	EEPROM_772B_NODE_ID	= 0x04
+	EEPROM_772B_NODE_ID	= 0x04,
+	EEPROM_772B_PHY_PWRCFG	= 0x18
 };
 
 enum AX88772B_MFB {
@@ -511,8 +520,11 @@ AX88772Device::StartDevice()
 			TRACE_ALWAYS("Error of writing frame burst:%#010x\n", result);
 			return result;
 		}
-		
-		rxcontrol = RXCTL_USB_MFB;
+		rxcontrol = RXCTL_HDR_TYPE_1;
+	} else {
+		// TODO: FreeBSD documents this to speed up xfers, I don't
+		// have the hardware to test however.
+		//rxcontrol = RXCTL_USB_MFB_MAX;
 	}
 
 	rxcontrol |= RXCTL_START | RXCTL_BROADCAST;