diff --git a/components/net/lwip-1.3.2/apps/ping.c b/components/net/lwip-1.3.2/apps/ping.c
index d3c3dd399b..1e595dce61 100644
--- a/components/net/lwip-1.3.2/apps/ping.c
+++ b/components/net/lwip-1.3.2/apps/ping.c
@@ -39,135 +39,140 @@
 static u16_t ping_seq_num;
 struct _ip_addr
 {
-	rt_uint8_t addr0, addr1, addr2, addr3;
+    rt_uint8_t addr0, addr1, addr2, addr3;
 };
 
 /** Prepare a echo ICMP request */
 static void ping_prepare_echo( struct icmp_echo_hdr *iecho, u16_t len)
 {
-	size_t i;
-	size_t data_len = len - sizeof(struct icmp_echo_hdr);
+    size_t i;
+    size_t data_len = len - sizeof(struct icmp_echo_hdr);
 
-	ICMPH_TYPE_SET(iecho, ICMP_ECHO);
-	ICMPH_CODE_SET(iecho, 0);
-	iecho->chksum = 0;
-	iecho->id     = PING_ID;
-	iecho->seqno  = htons(++ping_seq_num);
+    ICMPH_TYPE_SET(iecho, ICMP_ECHO);
+    ICMPH_CODE_SET(iecho, 0);
+    iecho->chksum = 0;
+    iecho->id     = PING_ID;
+    iecho->seqno  = htons(++ping_seq_num);
 
-	/* fill the additional data buffer with some data */
-	for(i = 0; i < data_len; i++)
-	{
-		((char*)iecho)[sizeof(struct icmp_echo_hdr) + i] = (char)i;
-	}
+    /* fill the additional data buffer with some data */
+    for(i = 0; i < data_len; i++)
+    {
+        ((char*)iecho)[sizeof(struct icmp_echo_hdr) + i] = (char)i;
+    }
 
-	iecho->chksum = inet_chksum(iecho, len);
+    iecho->chksum = inet_chksum(iecho, len);
 }
 
 /* Ping using the socket ip */
-static err_t ping_send(int s, struct ip_addr *addr)
+static err_t ping_send(int s, struct ip_addr *addr, int size)
 {
-	int err;
-	struct icmp_echo_hdr *iecho;
-	struct sockaddr_in to;
-	size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE;
-	LWIP_ASSERT("ping_size is too big", ping_size <= 0xffff);
+    int err;
+    struct icmp_echo_hdr *iecho;
+    struct sockaddr_in to;
+    size_t ping_size = sizeof(struct icmp_echo_hdr) + size;
+    LWIP_ASSERT("ping_size is too big", ping_size <= 0xffff);
 
-	iecho = rt_malloc(ping_size);
-	if (iecho == RT_NULL)
-	{
-		return ERR_MEM;
-	}
+    iecho = rt_malloc(ping_size);
+    if (iecho == RT_NULL)
+    {
+        return ERR_MEM;
+    }
 
-	ping_prepare_echo(iecho, (u16_t)ping_size);
+    ping_prepare_echo(iecho, (u16_t)ping_size);
 
-	to.sin_len = sizeof(to);
-	to.sin_family = AF_INET;
-	to.sin_addr.s_addr = addr->addr;
+    to.sin_len = sizeof(to);
+    to.sin_family = AF_INET;
+    to.sin_addr.s_addr = addr->addr;
 
-	err = lwip_sendto(s, iecho, ping_size, 0, (struct sockaddr*)&to, sizeof(to));
-	rt_free(iecho);
+    err = lwip_sendto(s, iecho, ping_size, 0, (struct sockaddr*)&to, sizeof(to));
+    rt_free(iecho);
 
-	return (err ? ERR_OK : ERR_VAL);
+    return (err ? ERR_OK : ERR_VAL);
 }
 
 static void ping_recv(int s)
 {
-	char buf[64];
-	int fromlen, len;
-	struct sockaddr_in from;
-	struct ip_hdr *iphdr;
-	struct icmp_echo_hdr *iecho;
-	struct _ip_addr *addr;
+    char buf[64];
+    int fromlen, len;
+    struct sockaddr_in from;
+    struct ip_hdr *iphdr;
+    struct icmp_echo_hdr *iecho;
+    struct _ip_addr *addr;
 
-	while((len = lwip_recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr*)&from, (socklen_t*)&fromlen)) > 0)
-	{
-		if (len >= (sizeof(struct ip_hdr)+sizeof(struct icmp_echo_hdr)))
-		{
-			addr = (struct _ip_addr *)&(from.sin_addr);
-			rt_kprintf("ping: recv %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
+    while((len = lwip_recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr*)&from, (socklen_t*)&fromlen)) > 0)
+    {
+        if (len >= (sizeof(struct ip_hdr)+sizeof(struct icmp_echo_hdr)))
+        {
+            addr = (struct _ip_addr *)&(from.sin_addr);
+            rt_kprintf("ping: recv %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
 
-			iphdr = (struct ip_hdr *)buf;
-			iecho = (struct icmp_echo_hdr *)(buf+(IPH_HL(iphdr) * 4));
-			if ((iecho->id == PING_ID) && (iecho->seqno == htons(ping_seq_num)))
-			{
-				return;
-			}
-			else
-			{
-				rt_kprintf("ping: drop\n");
-			}
-		}
-	}
+            iphdr = (struct ip_hdr *)buf;
+            iecho = (struct icmp_echo_hdr *)(buf+(IPH_HL(iphdr) * 4));
+            if ((iecho->id == PING_ID) && (iecho->seqno == htons(ping_seq_num)))
+            {
+                return;
+            }
+            else
+            {
+                rt_kprintf("ping: drop\n");
+            }
+        }
+    }
 
-	if (len <= 0)
-	{
-		rt_kprintf("ping: timeout\n");
-	}
+    if (len <= 0)
+    {
+        rt_kprintf("ping: timeout\n");
+    }
 }
 
 rt_err_t ping(char* target, rt_uint32_t time, rt_size_t size)
 {
-	int s;
-	int timeout = PING_RCV_TIMEO;
-	struct ip_addr ping_target;
-	rt_uint32_t send_time;
-	struct _ip_addr
-	{
-		rt_uint8_t addr0, addr1, addr2, addr3;
-	} *addr;
+    int s;
+    int timeout = PING_RCV_TIMEO;
+    struct ip_addr ping_target;
+    rt_uint32_t send_time;
+    struct _ip_addr
+    {
+        rt_uint8_t addr0, addr1, addr2, addr3;
+    } *addr;
 
     send_time = 0;
 
-	if (inet_aton(target, (struct in_addr*)&ping_target) == 0) return -RT_ERROR;
-	addr = (struct _ip_addr*)&ping_target;
+    if(size == 0)
+        size = PING_DATA_SIZE;
 
-	if ((s = lwip_socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP)) < 0)
-	{
-	    rt_kprintf("create socket failled\n");
-		return -RT_ERROR;
-	}
+    if (inet_aton(target, (struct in_addr*)&ping_target) == 0) return -RT_ERROR;
+    addr = (struct _ip_addr*)&ping_target;
 
-	lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
+    if ((s = lwip_socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP)) < 0)
+    {
+        rt_kprintf("create socket failled\n");
+        return -RT_ERROR;
+    }
 
-	while (1)
-	{
-		if (ping_send(s, &ping_target) == ERR_OK)
-		{
-			rt_kprintf("ping: send %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
-			ping_recv(s);
-		}
-		else
-		{
-			rt_kprintf("ping: send %d.%d.%d.%d - error\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
-		}
+    lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
 
-		send_time ++;
-		if (send_time >= time) break; /* send ping times reached, stop */
+    while (1)
+    {
+        if (ping_send(s, &ping_target, size) == ERR_OK)
+        {
+            rt_kprintf("ping: send %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
+            ping_recv(s);
+        }
+        else
+        {
+            rt_kprintf("ping: send %d.%d.%d.%d - error\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
+        }
 
-		rt_thread_delay(PING_DELAY); /* take a delay */
-	}
+        send_time ++;
+        if (send_time >= time) break; /* send ping times reached, stop */
 
-	return RT_EOK;
+        rt_thread_delay(PING_DELAY); /* take a delay */
+    }
+
+    lwip_close(s);
+
+    return RT_EOK;
 }
 #ifdef RT_USING_FINSH
 #include <finsh.h>
diff --git a/components/net/lwip/apps/ping.c b/components/net/lwip/apps/ping.c
index d3c3dd399b..1e595dce61 100644
--- a/components/net/lwip/apps/ping.c
+++ b/components/net/lwip/apps/ping.c
@@ -39,135 +39,140 @@
 static u16_t ping_seq_num;
 struct _ip_addr
 {
-	rt_uint8_t addr0, addr1, addr2, addr3;
+    rt_uint8_t addr0, addr1, addr2, addr3;
 };
 
 /** Prepare a echo ICMP request */
 static void ping_prepare_echo( struct icmp_echo_hdr *iecho, u16_t len)
 {
-	size_t i;
-	size_t data_len = len - sizeof(struct icmp_echo_hdr);
+    size_t i;
+    size_t data_len = len - sizeof(struct icmp_echo_hdr);
 
-	ICMPH_TYPE_SET(iecho, ICMP_ECHO);
-	ICMPH_CODE_SET(iecho, 0);
-	iecho->chksum = 0;
-	iecho->id     = PING_ID;
-	iecho->seqno  = htons(++ping_seq_num);
+    ICMPH_TYPE_SET(iecho, ICMP_ECHO);
+    ICMPH_CODE_SET(iecho, 0);
+    iecho->chksum = 0;
+    iecho->id     = PING_ID;
+    iecho->seqno  = htons(++ping_seq_num);
 
-	/* fill the additional data buffer with some data */
-	for(i = 0; i < data_len; i++)
-	{
-		((char*)iecho)[sizeof(struct icmp_echo_hdr) + i] = (char)i;
-	}
+    /* fill the additional data buffer with some data */
+    for(i = 0; i < data_len; i++)
+    {
+        ((char*)iecho)[sizeof(struct icmp_echo_hdr) + i] = (char)i;
+    }
 
-	iecho->chksum = inet_chksum(iecho, len);
+    iecho->chksum = inet_chksum(iecho, len);
 }
 
 /* Ping using the socket ip */
-static err_t ping_send(int s, struct ip_addr *addr)
+static err_t ping_send(int s, struct ip_addr *addr, int size)
 {
-	int err;
-	struct icmp_echo_hdr *iecho;
-	struct sockaddr_in to;
-	size_t ping_size = sizeof(struct icmp_echo_hdr) + PING_DATA_SIZE;
-	LWIP_ASSERT("ping_size is too big", ping_size <= 0xffff);
+    int err;
+    struct icmp_echo_hdr *iecho;
+    struct sockaddr_in to;
+    size_t ping_size = sizeof(struct icmp_echo_hdr) + size;
+    LWIP_ASSERT("ping_size is too big", ping_size <= 0xffff);
 
-	iecho = rt_malloc(ping_size);
-	if (iecho == RT_NULL)
-	{
-		return ERR_MEM;
-	}
+    iecho = rt_malloc(ping_size);
+    if (iecho == RT_NULL)
+    {
+        return ERR_MEM;
+    }
 
-	ping_prepare_echo(iecho, (u16_t)ping_size);
+    ping_prepare_echo(iecho, (u16_t)ping_size);
 
-	to.sin_len = sizeof(to);
-	to.sin_family = AF_INET;
-	to.sin_addr.s_addr = addr->addr;
+    to.sin_len = sizeof(to);
+    to.sin_family = AF_INET;
+    to.sin_addr.s_addr = addr->addr;
 
-	err = lwip_sendto(s, iecho, ping_size, 0, (struct sockaddr*)&to, sizeof(to));
-	rt_free(iecho);
+    err = lwip_sendto(s, iecho, ping_size, 0, (struct sockaddr*)&to, sizeof(to));
+    rt_free(iecho);
 
-	return (err ? ERR_OK : ERR_VAL);
+    return (err ? ERR_OK : ERR_VAL);
 }
 
 static void ping_recv(int s)
 {
-	char buf[64];
-	int fromlen, len;
-	struct sockaddr_in from;
-	struct ip_hdr *iphdr;
-	struct icmp_echo_hdr *iecho;
-	struct _ip_addr *addr;
+    char buf[64];
+    int fromlen, len;
+    struct sockaddr_in from;
+    struct ip_hdr *iphdr;
+    struct icmp_echo_hdr *iecho;
+    struct _ip_addr *addr;
 
-	while((len = lwip_recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr*)&from, (socklen_t*)&fromlen)) > 0)
-	{
-		if (len >= (sizeof(struct ip_hdr)+sizeof(struct icmp_echo_hdr)))
-		{
-			addr = (struct _ip_addr *)&(from.sin_addr);
-			rt_kprintf("ping: recv %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
+    while((len = lwip_recvfrom(s, buf, sizeof(buf), 0, (struct sockaddr*)&from, (socklen_t*)&fromlen)) > 0)
+    {
+        if (len >= (sizeof(struct ip_hdr)+sizeof(struct icmp_echo_hdr)))
+        {
+            addr = (struct _ip_addr *)&(from.sin_addr);
+            rt_kprintf("ping: recv %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
 
-			iphdr = (struct ip_hdr *)buf;
-			iecho = (struct icmp_echo_hdr *)(buf+(IPH_HL(iphdr) * 4));
-			if ((iecho->id == PING_ID) && (iecho->seqno == htons(ping_seq_num)))
-			{
-				return;
-			}
-			else
-			{
-				rt_kprintf("ping: drop\n");
-			}
-		}
-	}
+            iphdr = (struct ip_hdr *)buf;
+            iecho = (struct icmp_echo_hdr *)(buf+(IPH_HL(iphdr) * 4));
+            if ((iecho->id == PING_ID) && (iecho->seqno == htons(ping_seq_num)))
+            {
+                return;
+            }
+            else
+            {
+                rt_kprintf("ping: drop\n");
+            }
+        }
+    }
 
-	if (len <= 0)
-	{
-		rt_kprintf("ping: timeout\n");
-	}
+    if (len <= 0)
+    {
+        rt_kprintf("ping: timeout\n");
+    }
 }
 
 rt_err_t ping(char* target, rt_uint32_t time, rt_size_t size)
 {
-	int s;
-	int timeout = PING_RCV_TIMEO;
-	struct ip_addr ping_target;
-	rt_uint32_t send_time;
-	struct _ip_addr
-	{
-		rt_uint8_t addr0, addr1, addr2, addr3;
-	} *addr;
+    int s;
+    int timeout = PING_RCV_TIMEO;
+    struct ip_addr ping_target;
+    rt_uint32_t send_time;
+    struct _ip_addr
+    {
+        rt_uint8_t addr0, addr1, addr2, addr3;
+    } *addr;
 
     send_time = 0;
 
-	if (inet_aton(target, (struct in_addr*)&ping_target) == 0) return -RT_ERROR;
-	addr = (struct _ip_addr*)&ping_target;
+    if(size == 0)
+        size = PING_DATA_SIZE;
 
-	if ((s = lwip_socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP)) < 0)
-	{
-	    rt_kprintf("create socket failled\n");
-		return -RT_ERROR;
-	}
+    if (inet_aton(target, (struct in_addr*)&ping_target) == 0) return -RT_ERROR;
+    addr = (struct _ip_addr*)&ping_target;
 
-	lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
+    if ((s = lwip_socket(AF_INET, SOCK_RAW, IP_PROTO_ICMP)) < 0)
+    {
+        rt_kprintf("create socket failled\n");
+        return -RT_ERROR;
+    }
 
-	while (1)
-	{
-		if (ping_send(s, &ping_target) == ERR_OK)
-		{
-			rt_kprintf("ping: send %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
-			ping_recv(s);
-		}
-		else
-		{
-			rt_kprintf("ping: send %d.%d.%d.%d - error\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
-		}
+    lwip_setsockopt(s, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
 
-		send_time ++;
-		if (send_time >= time) break; /* send ping times reached, stop */
+    while (1)
+    {
+        if (ping_send(s, &ping_target, size) == ERR_OK)
+        {
+            rt_kprintf("ping: send %d.%d.%d.%d\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
+            ping_recv(s);
+        }
+        else
+        {
+            rt_kprintf("ping: send %d.%d.%d.%d - error\n", addr->addr0, addr->addr1, addr->addr2, addr->addr3);
+        }
 
-		rt_thread_delay(PING_DELAY); /* take a delay */
-	}
+        send_time ++;
+        if (send_time >= time) break; /* send ping times reached, stop */
 
-	return RT_EOK;
+        rt_thread_delay(PING_DELAY); /* take a delay */
+    }
+
+    lwip_close(s);
+
+    return RT_EOK;
 }
 #ifdef RT_USING_FINSH
 #include <finsh.h>