diff --git a/ugreen-nas-led/usr/sbin/ugreen-led-netdev b/ugreen-nas-led/usr/sbin/ugreen-led-netdev
index 54d834d..0b64703 100755
--- a/ugreen-nas-led/usr/sbin/ugreen-led-netdev
+++ b/ugreen-nas-led/usr/sbin/ugreen-led-netdev
@@ -44,15 +44,29 @@ function load_module () {
 }
 
 function set_net_led_color () {
-  local IFS
-  NET_SPEED=$(/usr/bin/cat "/sys/class/net/${NET_DEVICE}/speed")
-  NET_SPEED_PERCENTAGE=$(/usr/bin/bc --mathlib <<< "(${NET_SPEED} - ${NET_SPEED_MIN}) / (${NET_SPEED_MAX} - ${NET_SPEED_MIN})")
-  IFS=' '
+  local IFS=' '
   read -r RGB_RED_MIN RGB_GREEN_MIN RGB_BLUE_MIN <<< "${NET_LED_COLOR_SPEED_MIN}"
   read -r RGB_RED_MAX RGB_GREEN_MAX RGB_BLUE_MAX <<< "${NET_LED_COLOR_SPEED_MAX}"
-  RGB_RED=$(/usr/bin/bc --mathlib <<< "scale=0; ${RGB_RED_MIN} + ${NET_SPEED_PERCENTAGE} * (${RGB_RED_MAX} - ${RGB_RED_MIN})/1")
-  RGB_GREEN=$(/usr/bin/bc --mathlib <<< "scale=0; ${RGB_GREEN_MIN} + ${NET_SPEED_PERCENTAGE} * (${RGB_GREEN_MAX} - ${RGB_GREEN_MIN})/1")
-  RGB_BLUE=$(/usr/bin/bc --mathlib <<< "scale=0; ${RGB_BLUE_MIN} + ${NET_SPEED_PERCENTAGE} * (${RGB_BLUE_MAX} - ${RGB_BLUE_MIN})/1")
+  unset IFS
+  RATIO=$(
+    /usr/bin/awk -v speed="${NET_SPEED}" -v low="${NET_SPEED_MIN}" -v high="${NET_SPEED_MAX}" \
+      'BEGIN {print (speed - low) / (high - low)}'
+  )
+  RATIO=$(
+    /usr/bin/awk -v r="${RATIO}" 'BEGIN {print (r < 0) ? 0 : (r > 1) ? 1 : r}'
+  )
+  RGB_RED=$(
+    /usr/bin/awk -v ratio="${RATIO}" -v low="${RGB_RED_MIN}" -v high="${RGB_RED_MAX}" \
+      'BEGIN {printf "%.0f", low + ratio * (high - low)}'
+  )
+  RGB_GREEN=$(
+    /usr/bin/awk -v ratio="${RATIO}" -v low="${RGB_GREEN_MIN}" -v high="${RGB_GREEN_MAX}" \
+      'BEGIN {printf "%.0f", low + ratio * (high - low)}'
+  )
+  RGB_BLUE=$(
+    /usr/bin/awk -v ratio="${RATIO}" -v low="${RGB_BLUE_MIN}" -v high="${RGB_BLUE_MAX}" \
+      'BEGIN {printf "%.0f", low + ratio * (high - low)}'
+  )
   /usr/bin/echo "${RGB_RED} ${RGB_GREEN} ${RGB_BLUE}" > '/sys/class/leds/netdev/color'
 }
 
@@ -72,16 +86,37 @@ if [[ "${NET_LED_TX_RX}" == 'true' ]]; then
   /usr/bin/echo '1' > '/sys/class/leds/netdev/tx'
   /usr/bin/echo '1' > '/sys/class/leds/netdev/rx'
 fi
-/usr/bin/echo '250' > '/sys/class/leds/netdev/interval'
+/usr/bin/echo '200' > '/sys/class/leds/netdev/interval'
 /usr/bin/echo '255 255 255' > '/sys/class/leds/netdev/color'
 /usr/bin/echo "${NET_LED_BRIGHTNESS}" > '/sys/class/leds/netdev/brightness'
 
+if [[ -f "/sys/class/net/${NET_DEVICE}/speed" ]]; then
+  NET_SPEED=$(/usr/bin/cat "/sys/class/net/${NET_DEVICE}/speed")
+else
+  NET_SPEED='N/A'
+fi
+
 while true; do
   GATEWAY=$(/usr/bin/ip route | /usr/bin/mawk '/default/ { print $3 }')
   if /usr/bin/ping -q -c '1' -W '1' "${GATEWAY}" &> '/dev/null'; then
-    set_net_led_color
+    if ! set_net_led_color; then
+      /usr/bin/echo '255 255 255' > '/sys/class/leds/netdev/color'
+    fi
   else
-    /usr/bin/echo '255 0 0' > '/sys/class/leds/netdev/color'
+    case "${NET_SPEED}" in
+      100)
+        /usr/bin/echo '255 0 0' > '/sys/class/leds/netdev/color'
+      ;;
+      1000)
+        /usr/bin/echo '255 255 0' > '/sys/class/leds/netdev/color'
+      ;;
+      10000)
+        /usr/bin/echo '0 255 0' > '/sys/class/leds/netdev/color'
+      ;;
+      *)
+        /usr/bin/echo '255 255 255' > '/sys/class/leds/netdev/color'
+      ;;
+    esac
   fi
   /usr/bin/sleep '1m'
 done