diff --git a/arch/xtensa/src/esp32/esp32_clockconfig.c b/arch/xtensa/src/esp32/esp32_clockconfig.c
index 73abcac8e2..2da4e0b4de 100644
--- a/arch/xtensa/src/esp32/esp32_clockconfig.c
+++ b/arch/xtensa/src/esp32/esp32_clockconfig.c
@@ -72,7 +72,9 @@ enum xtal_freq_e
 
 void esp32_clockconfig(void)
 {
-#ifndef CONFIG_SUPPRESS_CLOCK_CONFIG
+#ifdef CONFIG_SUPPRESS_CLOCK_CONFIG
+#  warning WARNING: Clock coniguration disabled
+#else
   uint32_t freq_mhz = CONFIG_ESP32_DEFAULT_CPU_FREQ_MHZ;
   enum xtal_freq_e freq;
 
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index fc1425a768..a8b76290c4 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -429,24 +429,34 @@ static void tun_net_receive(FAR struct tun_device_s *priv)
 #if defined(CONFIG_NET_IPv4)
   ninfo("IPv4 frame\n");
   NETDEV_RXIPV4(&priv->dev);
+#################################################################################
+@@ -429,20 +431,27 @@ static void tun_receive(FAR struct tun_device_s *priv)
 
-  /* Give the IPv4 packet to the network layer */
+      /* Give the IPv4 packet to the network layer */
 
-  ipv4_input(&priv->dev);
+      ret = ipv4_input(&priv->dev);
 
-  /* If the above function invocation resulted in data that should be
-   * sent out on the network, the field  d_len will set to a value > 0.
-   */
+      if (ret == OK)
+        {
+          /* If the above function invocation resulted in data that should be
+           * sent out on the network, the field d_len will set to a value > 0.
+           */
 
-  if (priv->dev.d_len > 0)
-    {
-      priv->write_d_len = priv->dev.d_len;
-      tun_transmit(priv);
-    }
-  else
-    {
-      priv->write_d_len = 0;
-      tun_pollnotify(priv, POLLOUT);
+          if (priv->dev.d_len > 0)
+            {
+              priv->write_d_len = priv->dev.d_len;
+              tun_fd_transmit(priv);
+            }
+          else
+            {
+              tun_pollnotify(priv, POLLOUT);
+            }
+        }
+      else
+        {
+          priv->dev.d_len = 0;
+          tun_pollnotify(priv, POLLOUT);
+        }
     }
 
 #elif defined(CONFIG_NET_IPv6)
@@ -464,7 +474,7 @@ static void tun_net_receive(FAR struct tun_device_s *priv)
   if (priv->dev.d_len > 0)
     {
       priv->write_d_len = priv->dev.d_len;
-      tun_transmit(priv);
+      tun_fd_transmit(priv);
     }
   else
     {