diff --git a/kvmapp/system/init.d/S03usbdev b/kvmapp/system/init.d/S03usbdev
index e4a2c83..3e4c318 100755
--- a/kvmapp/system/init.d/S03usbdev
+++ b/kvmapp/system/init.d/S03usbdev
@@ -39,15 +39,30 @@ start_usb_dev(){
     mkdir configs/c.1/strings/0x409
     echo "NanoKVM" >  configs/c.1/strings/0x409/configuration
 
+    # Deterministic gadget MACs from the chip UID so the host-side RNDIS/NCM
+    # interface keeps a STABLE MAC across re-enumeration/reboot. Without this
+    # the kernel assigns a random dev_addr/host_addr on every bind, so the
+    # attached PC sees a brand-new network adapter (and MAC) each time.
+    usb_uid=$(sha512sum /sys/class/cvi-base/base_uid | head -c 4)
+    if [ -n "$usb_uid" ]
+    then
+        usb_dev_mac="48:da:35:6e:${usb_uid%??}:${usb_uid#??}"
+        usb_host_mac="48:da:35:6d:${usb_uid%??}:${usb_uid#??}"
+    fi
+
     if [ -e /boot/usb.ncm ]
     then
         mkdir functions/ncm.usb0
+        [ -n "$usb_dev_mac" ]  && echo "$usb_dev_mac"  > functions/ncm.usb0/dev_addr
+        [ -n "$usb_host_mac" ] && echo "$usb_host_mac" > functions/ncm.usb0/host_addr
         echo WINNCM > functions/ncm.usb0/os_desc/interface.ncm/compatible_id
         ln -s functions/ncm.usb0 configs/c.1/
     else
         if [ -e /boot/usb.rndis0 ]
         then
                 mkdir functions/rndis.usb0
+                [ -n "$usb_dev_mac" ]  && echo "$usb_dev_mac"  > functions/rndis.usb0/dev_addr
+                [ -n "$usb_host_mac" ] && echo "$usb_host_mac" > functions/rndis.usb0/host_addr
                 echo e0 > functions/rndis.usb0/class
                 echo 01 > functions/rndis.usb0/subclass
                 echo 03 > functions/rndis.usb0/protocol