diff --git a/drivers/wiznet5k/ethernet/socket.c b/drivers/wiznet5k/ethernet/socket.c
index 4c23481391..79e082cb51 100644
--- a/drivers/wiznet5k/ethernet/socket.c
+++ b/drivers/wiznet5k/ethernet/socket.c
@@ -204,13 +204,19 @@ int8_t connect(uint8_t sn, uint8_t * addr, uint16_t port)
 	setSn_DIPR(sn,addr);
 	setSn_DPORT(sn,port);
    #if _WIZCHIP_ == 5200   // for W5200 ARP errata 
-      setSUBR(0);
+    setSUBR(wizchip_getsubn());
    #endif
 	setSn_CR(sn,Sn_CR_CONNECT);
    while(getSn_CR(sn));
    if(sock_io_mode & (1<<sn)) return SOCK_BUSY;
    while(getSn_SR(sn) != SOCK_ESTABLISHED)
    {   
+        if (getSn_SR(sn) == SOCK_CLOSED) {
+            #if _WIZCHIP_ == 5200   // for W5200 ARP errata
+            setSUBR((uint8_t*)"\x00\x00\x00\x00");
+            #endif
+            return SOCKERR_SOCKCLOSED;
+        }
 		if (getSn_IR(sn) & Sn_IR_TIMEOUT)
 		{
 			setSn_IR(sn, Sn_IR_TIMEOUT);
@@ -390,15 +396,12 @@ int32_t sendto(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t
 	wiz_send_data(sn, buf, len);
 
    #if _WIZCHIP_ == 5200   // for W5200 ARP errata 
-      setSUBR(0);
+      setSUBR(wizchip_getsubn());
    #endif
 
 	setSn_CR(sn,Sn_CR_SEND);
 	/* wait to process the command... */
 	while(getSn_CR(sn));
-   #if _WIZCHIP_ == 5200   // for W5200 ARP errata 
-      setSUBR((uint8_t*)"\x00\x00\x00\x00");
-   #endif
    while(1)
    {
       tmp = getSn_IR(sn);
@@ -412,10 +415,16 @@ int32_t sendto(uint8_t sn, uint8_t * buf, uint16_t len, uint8_t * addr, uint16_t
       else if(tmp & Sn_IR_TIMEOUT)
       {
          setSn_IR(sn, Sn_IR_TIMEOUT);
+   #if _WIZCHIP_ == 5200   // for W5200 ARP errata 
+      setSUBR((uint8_t*)"\x00\x00\x00\x00");
+   #endif
          return SOCKERR_TIMEOUT;
       }
       ////////////
    }
+   #if _WIZCHIP_ == 5200   // for W5200 ARP errata 
+      setSUBR((uint8_t*)"\x00\x00\x00\x00");
+   #endif
 	return len;
 }
 
diff --git a/drivers/wiznet5k/ethernet/w5200/w5200.h b/drivers/wiznet5k/ethernet/w5200/w5200.h
index 1ed5f5a833..63561940f8 100644
--- a/drivers/wiznet5k/ethernet/w5200/w5200.h
+++ b/drivers/wiznet5k/ethernet/w5200/w5200.h
@@ -1315,7 +1315,9 @@ void     WIZCHIP_WRITE_BUF(uint32_t AddrSel, uint8_t* pBuf, uint16_t len);
  * @param (uint16_t)intlevel Value to set @ref INTLEVEL register.
  * @sa getINTLEVEL()
  */
-#if 0 // dpgeorge
+// dpgeorge: not yet implemented
+#define setINTLEVEL(intlevel) (void)intlevel
+#if 0
 #define setINTLEVEL(intlevel)  {\
 		WIZCHIP_WRITE(INTLEVEL,   (uint8_t)(intlevel >> 8)); \
 		WIZCHIP_WRITE(WIZCHIP_OFFSET_INC(INTLEVEL,1), (uint8_t) intlevel); \
@@ -1329,7 +1331,9 @@ void     WIZCHIP_WRITE_BUF(uint32_t AddrSel, uint8_t* pBuf, uint16_t len);
  * @return uint16_t. Value of @ref INTLEVEL register.
  * @sa setINTLEVEL()
  */
-#if 0 // dpgeorge
+// dpgeorge: not yet implemented
+#define getINTLEVEL() (0)
+#if 0
 #define getINTLEVEL() \
 		((WIZCHIP_READ(INTLEVEL) << 8) + WIZCHIP_READ(WIZCHIP_OFFSET_INC(INTLEVEL,1)))
 #endif
@@ -1376,9 +1380,12 @@ void     WIZCHIP_WRITE_BUF(uint32_t AddrSel, uint8_t* pBuf, uint16_t len);
  * @param (uint8_t)sir Value to set @ref SIR register.
  * @sa getSIR()
  */
+// dpgeorge: not yet implemented
+#define setSIR(sir) ((void)sir)
 #if 0
 #define setSIR(sir) \
 		WIZCHIP_WRITE(SIR, sir)
+#endif
 
 /**
  * @ingroup Common_register_access_function
@@ -1386,16 +1393,25 @@ void     WIZCHIP_WRITE_BUF(uint32_t AddrSel, uint8_t* pBuf, uint16_t len);
  * @return uint8_t. Value of @ref SIR register.
  * @sa setSIR()
  */
+// dpgeorge: not yet implemented
+#define getSIR() (0)
+#if 0
 #define getSIR() \
 		WIZCHIP_READ(SIR)
+#endif
+
 /**
  * @ingroup Common_register_access_function
  * @brief Set @ref SIMR register
  * @param (uint8_t)simr Value to set @ref SIMR register.
  * @sa getSIMR()
  */
+// dpgeorge: not yet implemented
+#define setSIMR(simr) ((void)simr)
+#if 0
 #define setSIMR(simr) \
 		WIZCHIP_WRITE(SIMR, simr)
+#endif
 
 /**
  * @ingroup Common_register_access_function
@@ -1403,6 +1419,9 @@ void     WIZCHIP_WRITE_BUF(uint32_t AddrSel, uint8_t* pBuf, uint16_t len);
  * @return uint8_t. Value of @ref SIMR register.
  * @sa setSIMR()
  */
+// dpgeorge: not yet implemented
+#define getSIMR() (0)
+#if 0
 #define getSIMR() \
 		WIZCHIP_READ(SIMR)
 #endif
@@ -1652,7 +1671,6 @@ void     WIZCHIP_WRITE_BUF(uint32_t AddrSel, uint8_t* pBuf, uint16_t len);
 #define getSn_IR(sn) \
 		(WIZCHIP_READ(Sn_IR(sn)) & 0x1F)
 
-#if 0 // dpgeorge
 /**
  * @ingroup Socket_register_access_function
  * @brief Set @ref Sn_IMR register
@@ -1660,8 +1678,12 @@ void     WIZCHIP_WRITE_BUF(uint32_t AddrSel, uint8_t* pBuf, uint16_t len);
  * @param (uint8_t)imr Value to set @ref Sn_IMR
  * @sa getSn_IMR()
  */
+// dpgeorge: not yet implemented
+#define setSn_IMR(sn, imr) (void)sn; (void)imr
+#if 0
 #define setSn_IMR(sn, imr) \
 		WIZCHIP_WRITE(Sn_IMR(sn), (imr & 0x1F))
+#endif
 
 /**
  * @ingroup Socket_register_access_function
@@ -1670,6 +1692,9 @@ void     WIZCHIP_WRITE_BUF(uint32_t AddrSel, uint8_t* pBuf, uint16_t len);
  * @return uint8_t. Value of @ref Sn_IMR.
  * @sa setSn_IMR()
  */
+// dpgeorge: not yet implemented
+#define getSn_IMR(sn) (0)
+#if 0
 #define getSn_IMR(sn) \
 		(WIZCHIP_READ(Sn_IMR(sn)) & 0x1F)
 #endif
diff --git a/drivers/wiznet5k/ethernet/wizchip_conf.c b/drivers/wiznet5k/ethernet/wizchip_conf.c
index c733cdf873..87b5427f26 100644
--- a/drivers/wiznet5k/ethernet/wizchip_conf.c
+++ b/drivers/wiznet5k/ethernet/wizchip_conf.c
@@ -121,6 +121,9 @@ _WIZCHIP  WIZCHIP =
 //    .IF.SPI._write_byte  = wizchip_spi_writebyte
       };
 
+#if _WIZCHIP_ == 5200   // for W5200 ARP errata
+static uint8_t    _SUBN_[4];     // subnet
+#endif
 static uint8_t    _DNS_[4];      // DNS server ip address
 static dhcp_mode  _DHCP_;        // DHCP mode
 
@@ -168,7 +171,7 @@ void reg_wizchip_bus_cbfunc(uint8_t(*bus_rb)(uint32_t addr), void (*bus_wb)(uint
    }
 }
 
-void reg_wizchip_spi_cbfunc((void (*spi_rb)(uint8_t *, uint32_t), void (*spi_wb)(const uint8_t *, uint32_t))
+void reg_wizchip_spi_cbfunc(void (*spi_rb)(uint8_t *, uint32_t), void (*spi_wb)(const uint8_t *, uint32_t))
 {
    while(!(WIZCHIP.if_mode & _WIZCHIP_IO_MODE_SPI_));
    
@@ -584,6 +587,12 @@ void wizchip_setnetinfo(wiz_NetInfo* pnetinfo)
    setGAR(pnetinfo->gw);
    setSUBR(pnetinfo->sn);
    setSIPR(pnetinfo->ip);
+#if _WIZCHIP_ == 5200   // for W5200 ARP errata
+   _SUBN_[0] = pnetinfo->sn[0];
+   _SUBN_[1] = pnetinfo->sn[1];
+   _SUBN_[2] = pnetinfo->sn[2];
+   _SUBN_[3] = pnetinfo->sn[3];
+#endif
    _DNS_[0] = pnetinfo->dns[0];
    _DNS_[1] = pnetinfo->dns[1];
    _DNS_[2] = pnetinfo->dns[2];
@@ -604,6 +613,12 @@ void wizchip_getnetinfo(wiz_NetInfo* pnetinfo)
    pnetinfo->dhcp  = _DHCP_;
 }
 
+#if _WIZCHIP_ == 5200   // for W5200 ARP errata
+uint8_t *wizchip_getsubn(void) {
+    return _SUBN_;
+}
+#endif
+
 int8_t wizchip_setnetmode(netmode_type netmode)
 {
    uint8_t tmp = 0;
diff --git a/drivers/wiznet5k/ethernet/wizchip_conf.h b/drivers/wiznet5k/ethernet/wizchip_conf.h
index 6f4461b3f3..55c79ae0a1 100644
--- a/drivers/wiznet5k/ethernet/wizchip_conf.h
+++ b/drivers/wiznet5k/ethernet/wizchip_conf.h
@@ -56,7 +56,7 @@
  * @todo You should select one, \b 5100, \b 5200 ,\b 5500 or etc. \n\n
  *       ex> <code> #define \_WIZCHIP_      5500 </code>
  */
-#define _WIZCHIP_                      5500   // 5100, 5200, 5500
+#define _WIZCHIP_                      5200   // 5100, 5200, 5500
 
 #define _WIZCHIP_IO_MODE_NONE_         0x0000
 #define _WIZCHIP_IO_MODE_BUS_          0x0100 /**< Bus interface mode */
@@ -515,6 +515,10 @@ void wizchip_setnetinfo(wiz_NetInfo* pnetinfo);
  */
 void wizchip_getnetinfo(wiz_NetInfo* pnetinfo);
 
+#if _WIZCHIP_ == 5200   // for W5200 ARP errata
+uint8_t *wizchip_getsubn(void);
+#endif
+
 /**
  * @ingroup extra_functions
  * @brief Set the network mode such WOL, PPPoE, Ping Block, and etc.