diff --git a/bsp/lpc408x/rtconfig.h b/bsp/lpc408x/rtconfig.h
index ddb85fe8f9f3de7f86c96869e1402841071cecf2..2ef8f1523edab29bab13ac35c4518d5e30ac0bcd 100644
--- a/bsp/lpc408x/rtconfig.h
+++ b/bsp/lpc408x/rtconfig.h
@@ -151,9 +151,7 @@
 // </section>
 
 // <section name="RT_USING_LWIP" description="lwip, a lightweight TCP/IP protocol stack" default="true" >
-//#define RT_USING_LWIP
-// <bool name="RT_USING_LWIP141" description="Using lwIP 1.4.1 version" default="true" />
-#define RT_USING_LWIP141
+#define RT_USING_LWIP
 // <bool name="RT_LWIP_ICMP" description="Enable ICMP protocol" default="true" />
 #define RT_LWIP_ICMP
 // <bool name="RT_LWIP_IGMP" description="Enable IGMP protocol" default="false" />
@@ -164,20 +162,10 @@
 #define RT_LWIP_TCP
 // <bool name="RT_LWIP_DNS" description="Enable DNS protocol" default="true" />
 #define RT_LWIP_DNS
-// <integer name="RT_LWIP_PBUF_NUM" description="Maximal number of buffers in the pbuf pool" default="4" />
-#define RT_LWIP_PBUF_NUM	4
-// <integer name="RT_LWIP_TCP_PCB_NUM" description="Maximal number of simultaneously active TCP connections" default="5" />
-#define RT_LWIP_TCP_PCB_NUM	3
-// <integer name="RT_LWIP_TCP_SND_BUF" description="TCP sender buffer size" default="8192" />
-#define RT_LWIP_TCP_SND_BUF	4086
-// <integer name="RT_LWIP_TCP_WND" description="TCP receive window" default="8192" />
-#define RT_LWIP_TCP_WND	2048
 // <bool name="RT_LWIP_SNMP" description="Enable SNMP protocol" default="false" />
 // #define RT_LWIP_SNMP
 // <bool name="RT_LWIP_DHCP" description="Enable DHCP client to get IP address" default="false" />
 // #define RT_LWIP_DHCP
-// <integer name="RT_LWIP_TCP_SEG_NUM" description="the number of simultaneously queued TCP" default="4" />
-#define RT_LWIP_TCP_SEG_NUM	4
 // <integer name="RT_LWIP_TCPTHREAD_PRIORITY" description="the thread priority of TCP thread" default="128" />
 #define RT_LWIP_TCPTHREAD_PRIORITY	12
 // <integer name="RT_LWIP_TCPTHREAD_MBOX_SIZE" description="the mail box size of TCP thread to wait for" default="32" />