diff --git a/components/net/lwip-1.4.1/src/include/netif/ethernetif.h b/components/net/lwip-1.4.1/src/include/netif/ethernetif.h
index 53dacf2270b33721ea36a8b06343b5ed9bb3da68..2019df701721522f77cfb845b06d9e909ee2b63d 100644
--- a/components/net/lwip-1.4.1/src/include/netif/ethernetif.h
+++ b/components/net/lwip-1.4.1/src/include/netif/ethernetif.h
@@ -5,7 +5,11 @@
 #include <rtthread.h>
 
 #define NIOCTL_GADDR		0x01
+#ifndef RT_LWIP_ETH_MTU
 #define ETHERNET_MTU		1500
+#else
+#define ETHERNET_MTU		RT_LWIP_ETH_MTU
+#endif
 
 struct eth_device
 {
diff --git a/components/net/lwip-1.4.1/src/lwipopts.h b/components/net/lwip-1.4.1/src/lwipopts.h
index dd5a3ace96dc14b5465709c9aa7e435d327d18d5..bff172e280493cafdb27119c18c4418e82a7fd43 100644
--- a/components/net/lwip-1.4.1/src/lwipopts.h
+++ b/components/net/lwip-1.4.1/src/lwipopts.h
@@ -38,8 +38,9 @@
 #define LWIP_PLATFORM_BYTESWAP      0
 #define BYTE_ORDER                  LITTLE_ENDIAN
 
-/* Enable SO_RCVTIMEO processing.   */
+/* Enable SO_RCVTIMEO/LWIP_SO_SNDTIMEO processing.   */
 #define LWIP_SO_RCVTIMEO            1
+#define LWIP_SO_SNDTIMEO            1
 
 /* #define RT_LWIP_DEBUG */
 
@@ -232,10 +233,15 @@
 
 /* IP reassembly and segmentation.These are orthogonal even
  * if they both deal with IP fragments */
-#define IP_REASSEMBLY               0
+#ifdef RT_LWIP_REASSEMBLY_FRAG
+#define IP_REASSEMBLY               1
+#define IP_FRAG                     1
 #define IP_REASS_MAX_PBUFS          10
 #define MEMP_NUM_REASSDATA          10
+#else
+#define IP_REASSEMBLY               0
 #define IP_FRAG                     0
+#endif
 
 /* ---------- ICMP options ---------- */
 #define ICMP_TTL                    255
diff --git a/components/net/lwip-1.4.1/src/netif/ethernetif.c b/components/net/lwip-1.4.1/src/netif/ethernetif.c
index 2853fdcd7c538bb9d6a13bbf624cf0b25eca45e0..ab7743290aa4eb22d5618b4f030bfed71e1928e9 100644
--- a/components/net/lwip-1.4.1/src/netif/ethernetif.c
+++ b/components/net/lwip-1.4.1/src/netif/ethernetif.c
@@ -67,6 +67,7 @@
 #define netifapi_netif_set_link_up(n)      netifapi_netif_common(n, netif_set_link_up, NULL)
 #define netifapi_netif_set_link_down(n)    netifapi_netif_common(n, netif_set_link_down, NULL)
 
+#ifndef LWIP_NO_TX_THREAD
 /**
  * Tx message structure for Ethernet interface
  */
@@ -85,7 +86,9 @@ static char eth_tx_thread_stack[512];
 static char eth_tx_thread_mb_pool[RT_LWIP_ETHTHREAD_MBOX_SIZE * 4];
 static char eth_tx_thread_stack[RT_LWIP_ETHTHREAD_STACKSIZE];
 #endif
+#endif
 
+#ifndef LWIP_NO_RX_THREAD
 static struct rt_mailbox eth_rx_thread_mb;
 static struct rt_thread eth_rx_thread;
 #ifndef RT_LWIP_ETHTHREAD_PRIORITY
@@ -97,12 +100,15 @@ static char eth_rx_thread_stack[1024];
 static char eth_rx_thread_mb_pool[RT_LWIP_ETHTHREAD_MBOX_SIZE * 4];
 static char eth_rx_thread_stack[RT_LWIP_ETHTHREAD_STACKSIZE];
 #endif
+#endif
 
 static err_t ethernetif_linkoutput(struct netif *netif, struct pbuf *p)
 {
+#ifndef LWIP_NO_TX_THREAD
     struct eth_tx_msg msg;
     struct eth_device* enetif;
 
+	RT_ASSERT(netif != RT_NULL);
     enetif = (struct eth_device*)netif->state;
 
     /* send a message to eth tx thread */
@@ -113,7 +119,17 @@ static err_t ethernetif_linkoutput(struct netif *netif, struct pbuf *p)
         /* waiting for ack */
         rt_sem_take(&(enetif->tx_ack), RT_WAITING_FOREVER);
     }
+#else
+    struct eth_device* enetif;
 
+	RT_ASSERT(netif != RT_NULL);
+    enetif = (struct eth_device*)netif->state;
+
+	if (enetif->eth_tx(&(enetif->parent), p) != RT_EOK)
+	{
+		return ERR_IF;
+	}
+#endif
     return ERR_OK;
 }
 
@@ -241,6 +257,7 @@ rt_err_t eth_device_init(struct eth_device * dev, char *name)
     return eth_device_init_with_flag(dev, name, flags);
 }
 
+#ifndef LWIP_NO_RX_THREAD
 rt_err_t eth_device_ready(struct eth_device* dev)
 {
     if (dev->netif)
@@ -267,7 +284,20 @@ rt_err_t eth_device_linkchange(struct eth_device* dev, rt_bool_t up)
     /* post message to ethernet thread */
     return rt_mb_send(&eth_rx_thread_mb, (rt_uint32_t)dev);
 }
+#else
+/* NOTE: please not use it in interrupt when no RxThread exist */
+rt_err_t eth_device_linkchange(struct eth_device* dev, rt_bool_t up)
+{
+	if (up == RT_TRUE)
+		netifapi_netif_set_link_up(dev->netif);
+	else
+		netifapi_netif_set_link_down(dev->netif);
+
+	return RT_EOK;
+}
+#endif
 
+#ifndef LWIP_NO_TX_THREAD
 /* Ethernet Tx Thread */
 static void eth_tx_thread_entry(void* parameter)
 {
@@ -297,7 +327,9 @@ static void eth_tx_thread_entry(void* parameter)
         }
     }
 }
+#endif
 
+#ifndef LWIP_NO_RX_THREAD
 /* Ethernet Rx Thread */
 static void eth_rx_thread_entry(void* parameter)
 {
@@ -349,13 +381,15 @@ static void eth_rx_thread_entry(void* parameter)
         }
     }
 }
+#endif
 
 int eth_system_device_init(void)
 {
     rt_err_t result = RT_EOK;
 
-    /* initialize Rx thread.
-     * initialize mailbox and create Ethernet Rx thread */
+    /* initialize Rx thread. */
+#ifndef LWIP_NO_RX_THREAD
+    /* initialize mailbox and create Ethernet Rx thread */
     result = rt_mb_init(&eth_rx_thread_mb, "erxmb",
                         &eth_rx_thread_mb_pool[0], sizeof(eth_rx_thread_mb_pool)/4,
                         RT_IPC_FLAG_FIFO);
@@ -367,8 +401,10 @@ int eth_system_device_init(void)
     RT_ASSERT(result == RT_EOK);
     result = rt_thread_startup(&eth_rx_thread);
     RT_ASSERT(result == RT_EOK);
+#endif
 
     /* initialize Tx thread */
+#ifndef LWIP_NO_TX_THREAD
     /* initialize mailbox and create Ethernet Tx thread */
     result = rt_mb_init(&eth_tx_thread_mb, "etxmb",
                         &eth_tx_thread_mb_pool[0], sizeof(eth_tx_thread_mb_pool)/4,
@@ -382,8 +418,9 @@ int eth_system_device_init(void)
 
     result = rt_thread_startup(&eth_tx_thread);
     RT_ASSERT(result == RT_EOK);
-	
-	return 0;
+#endif
+
+	return (int)result;
 }
 INIT_DEVICE_EXPORT(eth_system_device_init);