diff --git a/bsp/CME_M7/rtconfig.h b/bsp/CME_M7/rtconfig.h
index 97fa5136600f46337d43db9aa4fec9ebd878e21b..d0e44c8d283d3ffb2ddb5b2f08626859a12a09b4 100644
--- a/bsp/CME_M7/rtconfig.h
+++ b/bsp/CME_M7/rtconfig.h
@@ -103,23 +103,14 @@
 /* the number of simulatenously active TCP connections*/
 #define RT_LWIP_TCP_PCB_NUM		3
 
-/* ip address of target*/
-#define RT_LWIP_IPADDR0	192
-#define RT_LWIP_IPADDR1	168
-#define RT_LWIP_IPADDR2	1
-#define RT_LWIP_IPADDR3	30
-
-/* gateway address of target*/
-#define RT_LWIP_GWADDR0	192
-#define RT_LWIP_GWADDR1	168
-#define RT_LWIP_GWADDR2	1
-#define RT_LWIP_GWADDR3	1
-
-/* mask address of target*/
-#define RT_LWIP_MSKADDR0	255
-#define RT_LWIP_MSKADDR1	255
-#define RT_LWIP_MSKADDR2	255
-#define RT_LWIP_MSKADDR3	0
+/* ip address of target */
+#define RT_LWIP_IPADDR "192.168.1.30"
+
+/* gateway address of target */
+#define RT_LWIP_GWADDR  "192.168.1.1"
+
+/* mask address of target */
+#define RT_LWIP_MSKADDR  "255.255.255.0"
 
 /* tcp thread options */
 #define RT_LWIP_TCPTHREAD_PRIORITY		12
diff --git a/bsp/at91sam9260/rtconfig.h b/bsp/at91sam9260/rtconfig.h
index 07f39ca13a2925d86f371a32d713125b920109d8..53ca53359dc0e33ea227976c6b8d197bf2049d31 100755
--- a/bsp/at91sam9260/rtconfig.h
+++ b/bsp/at91sam9260/rtconfig.h
@@ -177,22 +177,13 @@
 /* #define RT_LWIP_DHCP */
 
 /* ip address of target */
-#define RT_LWIP_IPADDR0	192
-#define RT_LWIP_IPADDR1	168
-#define RT_LWIP_IPADDR2	1
-#define RT_LWIP_IPADDR3	30
+#define RT_LWIP_IPADDR "192.168.1.30"
 
 /* gateway address of target */
-#define RT_LWIP_GWADDR0	192
-#define RT_LWIP_GWADDR1	168
-#define RT_LWIP_GWADDR2	1
-#define RT_LWIP_GWADDR3	1
+#define RT_LWIP_GWADDR  "192.168.1.1"
 
 /* mask address of target */
-#define RT_LWIP_MSKADDR0	255
-#define RT_LWIP_MSKADDR1	255
-#define RT_LWIP_MSKADDR2	255
-#define RT_LWIP_MSKADDR3	0
+#define RT_LWIP_MSKADDR  "255.255.255.0"
 
 /* the number of blocks for pbuf */
 #define RT_LWIP_PBUF_NUM	16
diff --git a/bsp/frdm-k64f/rtconfig.h b/bsp/frdm-k64f/rtconfig.h
index 1cb5eca2592b0a7b6a7b3f9247873e05d78ab724..d8e6f6dbc5af7947f4927b4aff7aa9881d265cac 100644
--- a/bsp/frdm-k64f/rtconfig.h
+++ b/bsp/frdm-k64f/rtconfig.h
@@ -115,23 +115,14 @@
 /* the number of simulatenously active TCP connections*/
 #define RT_LWIP_TCP_PCB_NUM	5
 
-/* ip address of target*/
-#define RT_LWIP_IPADDR0	192
-#define RT_LWIP_IPADDR1	168
-#define RT_LWIP_IPADDR2	1
-#define RT_LWIP_IPADDR3	201
-
-/* gateway address of target*/
-#define RT_LWIP_GWADDR0	192
-#define RT_LWIP_GWADDR1	168
-#define RT_LWIP_GWADDR2	1
-#define RT_LWIP_GWADDR3	1
-
-/* mask address of target*/
-#define RT_LWIP_MSKADDR0	255
-#define RT_LWIP_MSKADDR1	255
-#define RT_LWIP_MSKADDR2	255
-#define RT_LWIP_MSKADDR3	0
+/* ip address of target */
+#define RT_LWIP_IPADDR "192.168.1.201"
+
+/* gateway address of target */
+#define RT_LWIP_GWADDR  "192.168.1.1"
+
+/* mask address of target */
+#define RT_LWIP_MSKADDR  "255.255.255.0"
 
 /* tcp thread options */
 #define RT_LWIP_TCPTHREAD_PRIORITY		12
diff --git a/bsp/lm3s8962/rtconfig.h b/bsp/lm3s8962/rtconfig.h
index 22a24106abceb2ffe066f70163aa78efbac6a0c0..b154688a6deaadf2750cb788792ee01bc63ee670 100644
--- a/bsp/lm3s8962/rtconfig.h
+++ b/bsp/lm3s8962/rtconfig.h
@@ -122,23 +122,14 @@
 
 #define RT_LWIP_DNS
 
-/* ip address of target*/
-#define RT_LWIP_IPADDR0	192
-#define RT_LWIP_IPADDR1	168
-#define RT_LWIP_IPADDR2	1
-#define RT_LWIP_IPADDR3	30
-
-/* gateway address of target*/
-#define RT_LWIP_GWADDR0	192
-#define RT_LWIP_GWADDR1	168
-#define RT_LWIP_GWADDR2	1
-#define RT_LWIP_GWADDR3	1
-
-/* mask address of target*/
-#define RT_LWIP_MSKADDR0	255
-#define RT_LWIP_MSKADDR1	255
-#define RT_LWIP_MSKADDR2	255
-#define RT_LWIP_MSKADDR3	0
+/* ip address of target */
+#define RT_LWIP_IPADDR "192.168.1.30"
+
+/* gateway address of target */
+#define RT_LWIP_GWADDR  "192.168.1.1"
+
+/* mask address of target */
+#define RT_LWIP_MSKADDR  "255.255.255.0"
 
 /* tcp thread options */
 #define RT_LWIP_TCPTHREAD_PRIORITY		22
diff --git a/bsp/lm3s9b9x/rtconfig.h b/bsp/lm3s9b9x/rtconfig.h
index b6afc3072360d0c52ae831fa86ac07f0aa421d33..b961c26d6f75cc6d0c3b8298ed9a8f2e6db2ba88 100644
--- a/bsp/lm3s9b9x/rtconfig.h
+++ b/bsp/lm3s9b9x/rtconfig.h
@@ -119,23 +119,14 @@
 
 #define RT_LWIP_DNS
 
-/* ip address of target*/
-#define RT_LWIP_IPADDR0	192
-#define RT_LWIP_IPADDR1	168
-#define RT_LWIP_IPADDR2	1
-#define RT_LWIP_IPADDR3	30
-
-/* gateway address of target*/
-#define RT_LWIP_GWADDR0	192
-#define RT_LWIP_GWADDR1	168
-#define RT_LWIP_GWADDR2	1
-#define RT_LWIP_GWADDR3	1
-
-/* mask address of target*/
-#define RT_LWIP_MSKADDR0	255
-#define RT_LWIP_MSKADDR1	255
-#define RT_LWIP_MSKADDR2	255
-#define RT_LWIP_MSKADDR3	0
+/* ip address of target */
+#define RT_LWIP_IPADDR "192.168.1.30"
+
+/* gateway address of target */
+#define RT_LWIP_GWADDR  "192.168.1.1"
+
+/* mask address of target */
+#define RT_LWIP_MSKADDR  "255.255.255.0"
 
 /* tcp thread options */
 #define RT_LWIP_TCPTHREAD_PRIORITY		12
diff --git a/bsp/lpc176x/rtconfig.h b/bsp/lpc176x/rtconfig.h
index eb7e3e6401dd153a93ec73b0efee5dc5fdf4e90b..726b887047c9849005f4e895fc0cb9b653dad274 100644
--- a/bsp/lpc176x/rtconfig.h
+++ b/bsp/lpc176x/rtconfig.h
@@ -191,20 +191,11 @@
 // <integer name="RT_LWIP_ETHTHREAD_STACKSIZE" description="the stack size of ethnetif thread" default="512" />
 #define RT_LWIP_ETHTHREAD_STACKSIZE	512
 // <ipaddr name="RT_LWIP_IPADDR" description="IP address of device" default="192.168.1.30" />
-#define RT_LWIP_IPADDR0 192
-#define RT_LWIP_IPADDR1 168
-#define RT_LWIP_IPADDR2 1
-#define RT_LWIP_IPADDR3 30
+#define RT_LWIP_IPADDR "192.168.1.30"
 // <ipaddr name="RT_LWIP_GWADDR" description="Gateway address of device" default="192.168.1.1" />
-#define RT_LWIP_GWADDR0 192
-#define RT_LWIP_GWADDR1 168
-#define RT_LWIP_GWADDR2 1
-#define RT_LWIP_GWADDR3 1
+#define RT_LWIP_GWADDR  "192.168.1.1"
 // <ipaddr name="RT_LWIP_MSKADDR" description="Mask address of device" default="255.255.255.0" />
-#define RT_LWIP_MSKADDR0 255
-#define RT_LWIP_MSKADDR1 255
-#define RT_LWIP_MSKADDR2 255
-#define RT_LWIP_MSKADDR3 0
+#define RT_LWIP_MSKADDR  "255.255.255.0"
 // </section>
 
 // <bool name="RT_USING_CMSIS_OS" description="Using CMSIS OS API" default="true" />
diff --git a/bsp/mini2440/rtconfig.h b/bsp/mini2440/rtconfig.h
index 32ee42c9088c1d65882c331caa1839747eb8f77b..475ba91062fc69f592afc28cdd219430c2a5a701 100644
--- a/bsp/mini2440/rtconfig.h
+++ b/bsp/mini2440/rtconfig.h
@@ -164,20 +164,11 @@
 // <integer name="RT_LWIP_ETHTHREAD_STACKSIZE" description="the stack size of ethnetif thread" default="512" />
 #define RT_LWIP_ETHTHREAD_STACKSIZE	512
 // <ipaddr name="RT_LWIP_IPADDR" description="IP address of device" default="192.168.1.30" />
-#define RT_LWIP_IPADDR0 192
-#define RT_LWIP_IPADDR1 168
-#define RT_LWIP_IPADDR2 1
-#define RT_LWIP_IPADDR3 30
+#define RT_LWIP_IPADDR "192.168.1.30"
 // <ipaddr name="RT_LWIP_GWADDR" description="Gateway address of device" default="192.168.1.1" />
-#define RT_LWIP_GWADDR0 192
-#define RT_LWIP_GWADDR1 168
-#define RT_LWIP_GWADDR2 1
-#define RT_LWIP_GWADDR3 1
+#define RT_LWIP_GWADDR  "192.168.1.1"
 // <ipaddr name="RT_LWIP_MSKADDR" description="Mask address of device" default="255.255.255.0" />
-#define RT_LWIP_MSKADDR0 255
-#define RT_LWIP_MSKADDR1 255
-#define RT_LWIP_MSKADDR2 255
-#define RT_LWIP_MSKADDR3 0
+#define RT_LWIP_MSKADDR  "255.255.255.0"
 // </section>
 
 // <section name="RT_USING_MODULE" description="Application module" default="true" >
diff --git a/bsp/sam7x/rtconfig.h b/bsp/sam7x/rtconfig.h
index a1c31bc3ce3aee9c307f8065579dbda0189e3f86..bb3e3546d02a9fe4ade256ac68523235f7457eb0 100644
--- a/bsp/sam7x/rtconfig.h
+++ b/bsp/sam7x/rtconfig.h
@@ -118,23 +118,14 @@
 /* Using DHCP*/
 /* #define RT_LWIP_DHCP */
 
-/* ip address of target*/
-#define RT_LWIP_IPADDR0	192
-#define RT_LWIP_IPADDR1	168
-#define RT_LWIP_IPADDR2	1
-#define RT_LWIP_IPADDR3	30
-
-/* gateway address of target*/
-#define RT_LWIP_GWADDR0	192
-#define RT_LWIP_GWADDR1	168
-#define RT_LWIP_GWADDR2	1
-#define RT_LWIP_GWADDR3	1
-
-/* mask address of target*/
-#define RT_LWIP_MSKADDR0	255
-#define RT_LWIP_MSKADDR1	255
-#define RT_LWIP_MSKADDR2	255
-#define RT_LWIP_MSKADDR3	0
+/* ip address of target */
+#define RT_LWIP_IPADDR "192.168.1.30"
+
+/* gateway address of target */
+#define RT_LWIP_GWADDR  "192.168.1.1"
+
+/* mask address of target */
+#define RT_LWIP_MSKADDR  "255.255.255.0"
 
 /* SECTION: DFS options */
 //#define RT_USING_DFS
diff --git a/bsp/stm32f107/rtconfig.h b/bsp/stm32f107/rtconfig.h
index c4cd0c836890f48f6833c1c157f265ed57808c6e..210b165a4db7d3349c9e10b9951bf883bce55f1f 100644
--- a/bsp/stm32f107/rtconfig.h
+++ b/bsp/stm32f107/rtconfig.h
@@ -115,23 +115,14 @@
 /* the number of simulatenously active TCP connections*/
 #define RT_LWIP_TCP_PCB_NUM	5
 
-/* ip address of target*/
-#define RT_LWIP_IPADDR0	192
-#define RT_LWIP_IPADDR1	168
-#define RT_LWIP_IPADDR2	1
-#define RT_LWIP_IPADDR3	30
-
-/* gateway address of target*/
-#define RT_LWIP_GWADDR0	192
-#define RT_LWIP_GWADDR1	168
-#define RT_LWIP_GWADDR2	1
-#define RT_LWIP_GWADDR3	1
-
-/* mask address of target*/
-#define RT_LWIP_MSKADDR0	255
-#define RT_LWIP_MSKADDR1	255
-#define RT_LWIP_MSKADDR2	255
-#define RT_LWIP_MSKADDR3	0
+/* ip address of target */
+#define RT_LWIP_IPADDR "192.168.1.30"
+
+/* gateway address of target */
+#define RT_LWIP_GWADDR  "192.168.1.1"
+
+/* mask address of target */
+#define RT_LWIP_MSKADDR  "255.255.255.0"
 
 /* tcp thread options */
 #define RT_LWIP_TCPTHREAD_PRIORITY		12
diff --git a/bsp/tm4c129x/rtconfig.h b/bsp/tm4c129x/rtconfig.h
index 6da197d331aa1701ebb48e5ec8eea7d328264893..c0c7ffced13af0326187db90b365ac14e9257b44 100644
--- a/bsp/tm4c129x/rtconfig.h
+++ b/bsp/tm4c129x/rtconfig.h
@@ -206,20 +206,11 @@
 // <integer name="RT_LWIP_ETHTHREAD_STACKSIZE" description="the stack size of ethnetif thread" default="512" />
 #define RT_LWIP_ETHTHREAD_STACKSIZE 512
 // <ipaddr name="RT_LWIP_IPADDR" description="IP address of device" default="192.168.1.30" />
-#define RT_LWIP_IPADDR0 192
-#define RT_LWIP_IPADDR1 168
-#define RT_LWIP_IPADDR2 1
-#define RT_LWIP_IPADDR3 30
+#define RT_LWIP_IPADDR "192.168.1.30"
 // <ipaddr name="RT_LWIP_GWADDR" description="Gateway address of device" default="192.168.1.1" />
-#define RT_LWIP_GWADDR0 192
-#define RT_LWIP_GWADDR1 168
-#define RT_LWIP_GWADDR2 1
-#define RT_LWIP_GWADDR3 1
+#define RT_LWIP_GWADDR  "192.168.1.1"
 // <ipaddr name="RT_LWIP_MSKADDR" description="Mask address of device" default="255.255.255.0" />
-#define RT_LWIP_MSKADDR0 255
-#define RT_LWIP_MSKADDR1 255
-#define RT_LWIP_MSKADDR2 255
-#define RT_LWIP_MSKADDR3 0
+#define RT_LWIP_MSKADDR  "255.255.255.0"
 // </section>
 
 
diff --git a/components/net/lwip-1.4.1/src/arch/sys_arch.c b/components/net/lwip-1.4.1/src/arch/sys_arch.c
index 0963f8d403ef617c8955dbef259defc8127490a6..14e61fb88fd9d96b8a042bf04b08476c93d504c8 100644
--- a/components/net/lwip-1.4.1/src/arch/sys_arch.c
+++ b/components/net/lwip-1.4.1/src/arch/sys_arch.c
@@ -26,6 +26,7 @@
 #include "netif/ethernetif.h"
 #include "lwip/sio.h"
 #include <lwip/init.h>
+#include "lwip/inet.h"
 
 #include <string.h>
 
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 96e1672fe99173995e6ab601d83d448e3fb0f5b1..9fbb883f363fb2d0b95bd84e5ca210a689e7a19c 100644
--- a/components/net/lwip-1.4.1/src/netif/ethernetif.c
+++ b/components/net/lwip-1.4.1/src/netif/ethernetif.c
@@ -63,6 +63,7 @@
 
 #include "netif/etharp.h"
 #include "netif/ethernetif.h"
+#include "lwip/inet.h"
 
 #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)