diff --git a/include/nuttx/net/netdev.h b/include/nuttx/net/netdev.h
index a759eac4de6..1b6a10bd5c5 100644
--- a/include/nuttx/net/netdev.h
+++ b/include/nuttx/net/netdev.h
@@ -481,4 +481,47 @@ uint16_t ipv4_chksum(FAR struct net_driver_s *dev);
 #ifdef CONFIG_NET_IPv6
 uint16_t ipv6_chksum(FAR struct net_driver_s *dev);
 #endif
+
+/****************************************************************************
+ * Function: netdev_ipv4_hdrlen
+ *
+ * Description:
+ *    Provide header length for interface based on device
+ *
+ * Input Parameters:
+ *   dev Device structure pointer
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_NET_IPv4
+#if defined(CONFIG_NET_MULTILINK)
+#  define netdev_ipv4_hdrlen(dev) (dev->d_llhdrlen)
+#elif defined(CONFIG_NET_ETHERNET)
+#  define netdev_ipv4_hdrlen(dev) ETH_HDRLEN
+#else /* if defined(CONFIG_NET_SLIP) */
+#  define netdev_ipv4_hdrlen(dev) 0
+#endif
+#endif /* CONFIG_NET_IPv4 */
+
+/****************************************************************************
+ * Function: netdev_ipv6_hdrlen
+ *
+ * Description:
+ *    Provide header lenght for interface based on device
+ *
+ * Input Parameters:
+ *   dev Device structure pointer
+ *
+ ****************************************************************************/
+
+#ifdef CONFIG_NET_IPv6
+#if defined(CONFIG_NET_MULTILINK)
+#  define netdev_ipv6_hdrlen(dev) dev->d_llhdrlen
+#elif defined(CONFIG_NET_ETHERNET)
+#  define netdev_ipv6_hdrlen(dev) ETH_HDRLEN
+#else /* if defined(CONFIG_NET_SLIP) */
+#  define netdev_ipv6_hdrlen(dev) 0
+#endif
+#endif /* CONFIG_NET_IPv6 */
+
 #endif /* __INCLUDE_NUTTX_NET_NETDEV_H */
diff --git a/libc/Kconfig b/libc/Kconfig
index e4da4d61d99..ec20c59113f 100644
--- a/libc/Kconfig
+++ b/libc/Kconfig
@@ -274,6 +274,8 @@ config LIBC_LOCALTIME
 		timezone file is required for any another time zone and the environment
 		variable TZ must be set to the name of that file.
 
+		See https://www.iana.org/time-zones
+
 if LIBC_LOCALTIME
 
 config LIBC_TZ_MAX_TIMES
diff --git a/net/devif/ipv6_input.c b/net/devif/ipv6_input.c
index 680a54371a4..fa155202c6d 100644
--- a/net/devif/ipv6_input.c
+++ b/net/devif/ipv6_input.c
@@ -178,13 +178,8 @@ int ipv6_input(FAR struct net_driver_s *dev)
    * headers.
    */
 
-#if defined(CONFIG_NET_MULTILINK)
-  pktlen = (ipv6->len[0] << 8) + ipv6->len[1] + IPv6_HDRLEN + dev->d_llhdrlen;
-#elif defined(CONFIG_NET_ETHERNET)
-  pktlen = (ipv6->len[0] << 8) + ipv6->len[1] + IPv6_HDRLEN + ETH_HDRLEN;
-#else /* if defined(CONFIG_NET_SLIP) */
-  pktlen = (ipv6->len[0] << 8) + ipv6->len[1] + IPv6_HDRLEN;
-#endif
+  pktlen = (ipv6->len[0] << 8) + ipv6->len[1] + IPv6_HDRLEN + netdev_ip +
+            netdev_ipv6_hdrlen(dev);
 
   if (pktlen <= dev->d_len)
     {
diff --git a/net/icmpv6/icmpv6_rsolicit.c b/net/icmpv6/icmpv6_rsolicit.c
index 03198759e71..58e60fdd3d8 100644
--- a/net/icmpv6/icmpv6_rsolicit.c
+++ b/net/icmpv6/icmpv6_rsolicit.c
@@ -182,15 +182,7 @@ void icmpv6_rsolicit(FAR struct net_driver_s *dev)
   /* Add the size of the layer layer header to the total size of the
    * outgoing packet.
    */
-
-#if defined(CONFIG_NET_MULTILINK)
-  dev->d_len += dev->d_llhdrlen;
-#elif defined(CONFIG_NET_ETHERNET)
-  dev->d_len += ETH_HDRLEN;
-#else /* if defined(CONFIG_NET_SLIP) */
-  /* SLIP has no link layer header */
-#endif
-
+  dev->d_len += netdev_ipv6_hdrlen(dev);
   nllvdbg("Outgoing ICMPv6 Router Solicitation length: %d (%d)\n",
           dev->d_len, (icmp->len[0] << 8) | icmp->len[1]);
 
diff --git a/net/icmpv6/icmpv6_solicit.c b/net/icmpv6/icmpv6_solicit.c
index a6fe352058a..05486200209 100644
--- a/net/icmpv6/icmpv6_solicit.c
+++ b/net/icmpv6/icmpv6_solicit.c
@@ -210,15 +210,7 @@ void icmpv6_solicit(FAR struct net_driver_s *dev,
   /* Add the size of the layer layer header to the total size of the
    * outgoing packet.
    */
-
-#if defined(CONFIG_NET_MULTILINK)
-  dev->d_len += dev->d_llhdrlen;
-#elif defined(CONFIG_NET_ETHERNET)
-  dev->d_len += ETH_HDRLEN;
-#else /* if defined(CONFIG_NET_SLIP) */
-  /* SLIP has no link layer header */
-#endif
-
+  dev->d_len += netdev_ipv6_hdrlen(dev);
   nllvdbg("Outgoing ICMPv6 Neighbor Solicitation length: %d (%d)\n",
           dev->d_len, (icmp->len[0] << 8) | icmp->len[1]);
 
diff --git a/net/neighbor/neighbor_out.c b/net/neighbor/neighbor_out.c
index 615f2c6ad14..f8d3a80d570 100644
--- a/net/neighbor/neighbor_out.c
+++ b/net/neighbor/neighbor_out.c
@@ -245,14 +245,7 @@ void neighbor_out(FAR struct net_driver_s *dev)
    * outgoing packet.
    */
 
-#if defined(CONFIG_NET_MULTILINK)
-  dev->d_len += dev->d_llhdrlen;
-#elif defined(CONFIG_NET_ETHERNET)
-  dev->d_len += ETH_HDRLEN;
-#else /* if defined(CONFIG_NET_SLIP) */
-  /* SLIP has no link layer header */
-#endif
-
+  dev_d_len += netdev_ipv6_hdrlen(dev);
   nllvdbg("Outgoing IPv6 Packet length: %d (%d)\n",
           dev->d_len, (ip->len[0] << 8) | ip->len[1]);
 }