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 c94b54dd1d24fe4a3ac3cc3caa4d2baff26bfffa..287c861f042d314d5d3ced6be4732989f14f4bdf 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
@@ -601,26 +601,6 @@ u32_t sys_now(void)
 	return rt_tick_get() * (1000 / RT_TICK_PER_SECOND);
 }
 
-/*
- * lwIP IPv4 input hook
- */
-#ifdef LWIP_USING_IP4INPUT_HOOK
-static int (*_lwip_ip_input_hook)(struct pbuf *p, struct netif *inp) = RT_NULL;
-
-void lwip_ip_input_set_hook(int (*hook)(struct pbuf *p, struct netif *inp))
-{
-    _lwip_ip_input_hook = hook;
-}
-
-int lwip_ip_input_hook(struct pbuf *p, struct netif *inp)
-{
-    if (_lwip_ip_input_hook != RT_NULL) 
-        return _lwip_ip_input_hook(p, inp);
-
-    return 0;
-}
-#endif
-
 #ifdef RT_LWIP_PPP
 u32_t sio_read(sio_fd_t fd, u8_t *buf, u32_t size)
 {
diff --git a/components/net/lwip-1.4.1/src/lwipopts.h b/components/net/lwip-1.4.1/src/lwipopts.h
index edae3163c3ab732a78ce7e3e29ba5db7d334ecb1..db2019bd724bb75be82def63d473280d6f05b82f 100644
--- a/components/net/lwip-1.4.1/src/lwipopts.h
+++ b/components/net/lwip-1.4.1/src/lwipopts.h
@@ -161,12 +161,10 @@
  */
 #define SYS_LIGHTWEIGHT_PROT        (NO_SYS==0)
 
-#ifdef LWIP_USING_IP4INPUT_HOOK
-struct pbuf;
-struct netif;
-int lwip_ip_input_hook(struct pbuf *p, struct netif *inp);
-
-#define LWIP_HOOK_IP4_INPUT         lwip_ip_input_hook
+#ifdef LWIP_USING_NAT
+#define LWIP_NAT                    1
+#else
+#define LWIP_NAT                    0
 #endif
 
 /* ---------- TCP options ---------- */
diff --git a/components/net/lwip_nat/SConscript b/components/net/lwip_nat/SConscript
index ffb4e4bc1658e186f7ca06122a5adb4ec8c011ef..ce684f677a67ff1803d7f0016074d8e6520775f5 100644
--- a/components/net/lwip_nat/SConscript
+++ b/components/net/lwip_nat/SConscript
@@ -5,6 +5,6 @@ src = Glob('*.c')
 
 CPPPATH = [cwd]
 
-group = DefineGroup('LwIP', src, depend = ['RT_USING_LWIP', 'LWIP_USING_NAT', 'LWIP_USING_IP4INPUT_HOOK'], CPPPATH = CPPPATH)
+group = DefineGroup('LwIP', src, depend = ['RT_USING_LWIP', 'LWIP_USING_NAT'], CPPPATH = CPPPATH)
 
 Return('group')
diff --git a/components/net/lwip_nat/ipv4_nat.c b/components/net/lwip_nat/ipv4_nat.c
index c17ce438ac74b96bc6b3279cd7ed6b37202000e9..63f1b64a3aa80a97e4e2005b1e40345906f345cd 100644
--- a/components/net/lwip_nat/ipv4_nat.c
+++ b/components/net/lwip_nat/ipv4_nat.c
@@ -252,9 +252,6 @@ ip_nat_init(void)
   /* we must lock scheduler to protect following code */  
   rt_enter_critical();
   
-  /* register to the ipv4 hook function */
-  lwip_ip_input_set_hook(ip_nat_input);
-  
   /* add a lwip timer for NAT */
   sys_timeout(LWIP_NAT_TMR_INTERVAL_SEC, nat_timer, NULL);