diff --git a/README.md b/README.md
index 2cdd923..60c268d 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,4 @@
-# STM32Ethernet
-
-## Ethernet Library for Arduino
+# STM32 Ethernet Library for Arduino
With an STM32 board with Ethernet compatibility, this library allows a STM32
board (NUCLEO, DISCOVERY, ...) to connect to the internet.
@@ -8,14 +6,25 @@ board (NUCLEO, DISCOVERY, ...) to connect to the internet.
This library follows the Ethernet API from Arduino.
For more information about it please visit: http://www.arduino.cc/en/Reference/Ethernet
-## Note
+## Dependency
-The library is based on LwIP, a Lightweight TCP/IP stack, available here:
+This library is based on LwIP, a Lightweight TCP/IP stack, available here:
http://git.savannah.gnu.org/cgit/lwip.git
-The LwIP has been ported as Arduino library. The STM32Ethernet library depends
-on it.
+The LwIP has been ported as Arduino library and is available thanks Arduino Library Manager.
+
+Source: https://github.com/stm32duino/LwIP
+
+## Configuration
+
+The LwIP has several user defined options, which is specified from within the `lwipopts.h` file.
+
+This library provides a default user defined options file named `lwipopts_default.h`.
+
+User can provide his own defined options at sketch level by adding his configuration in a file named `STM32lwipopts.h`.
+
+## Note
`EthernetClass::maintain()` in no more required to renew IP address from DHCP.
It is done automatically by the LwIP stack in a background task.
diff --git a/library.properties b/library.properties
index 5a57f14..0cbb04a 100644
--- a/library.properties
+++ b/library.properties
@@ -1,5 +1,5 @@
name=STM32duino STM32Ethernet
-version=1.0.2
+version=1.0.3
author=Various
maintainer=STMicroelectronics
sentence=Enables network connection (local and Internet) using the STM32 Board.
diff --git a/src/lwipopts.h b/src/lwipopts.h
new file mode 100644
index 0000000..56f805b
--- /dev/null
+++ b/src/lwipopts.h
@@ -0,0 +1,18 @@
+/*
+ * @file lwipopts.h
+ * @author Frederic Pillon for STMicroelectronics.
+ * @brief Include header file to match Arduino library format
+ */
+
+#ifndef _ARDUINO_LWIPOPTS_H
+#define _ARDUINO_LWIPOPTS_H
+
+/* LwIP specific configuration options. */
+#if __has_include("STM32lwipopts.h")
+#include "STM32lwipopts.h"
+#else
+#include "lwipopts_default.h"
+#endif
+
+#endif /* _ARDUINO_LWIPOPTS_H */
+
diff --git a/src/lwipopts_default.h b/src/lwipopts_default.h
new file mode 100644
index 0000000..7a988f5
--- /dev/null
+++ b/src/lwipopts_default.h
@@ -0,0 +1,249 @@
+/**
+ ******************************************************************************
+ * @file lwipopts_default.h
+ * @author MCD Application Team
+ * @brief lwIP Options Configuration.
+ ******************************************************************************
+ * @attention
+ *
+ * © Copyright (c) 2017 STMicroelectronics International N.V.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted, provided that the following conditions are met:
+ *
+ * 1. Redistribution of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * 3. Neither the name of STMicroelectronics nor the names of other
+ * contributors to this software may be used to endorse or promote products
+ * derived from this software without specific written permission.
+ * 4. This software, including modifications and/or derivative works of this
+ * software, must execute solely and exclusively on microcontroller or
+ * microprocessor devices manufactured by or for STMicroelectronics.
+ * 5. Redistribution and use of this software other than as permitted under
+ * this license is void and will automatically terminate your rights under
+ * this license.
+ *
+ * THIS SOFTWARE IS PROVIDED BY STMICROELECTRONICS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS, IMPLIED OR STATUTORY WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+ * PARTICULAR PURPOSE AND NON-INFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY
+ * RIGHTS ARE DISCLAIMED TO THE FULLEST EXTENT PERMITTED BY LAW. IN NO EVENT
+ * SHALL STMICROELECTRONICS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+ * OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
+ * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ ******************************************************************************
+ */
+#ifndef __LWIPOPTS_H__
+#define __LWIPOPTS_H__
+
+/**
+ * NO_SYS==1: Provides VERY minimal functionality. Otherwise,
+ * use lwIP facilities.
+ */
+#define NO_SYS 1
+
+/**
+ * SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain
+ * critical regions during buffer allocation, deallocation and memory
+ * allocation and deallocation.
+ */
+#define SYS_LIGHTWEIGHT_PROT 0
+
+/* ---------- Memory options ---------- */
+/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which
+ lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2
+ byte alignment -> define MEM_ALIGNMENT to 2. */
+#define MEM_ALIGNMENT 4
+
+/* MEM_SIZE: the size of the heap memory. If the application will send
+a lot of data that needs to be copied, this should be set high. */
+#define MEM_SIZE (10*1024)
+
+/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application
+ sends a lot of data out of ROM (or other static memory), this
+ should be set high. */
+#define MEMP_NUM_PBUF 10
+/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
+ per active UDP "connection". */
+#define MEMP_NUM_UDP_PCB 6
+/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP
+ connections. */
+#define MEMP_NUM_TCP_PCB 10
+/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP
+ connections. */
+#define MEMP_NUM_TCP_PCB_LISTEN 6
+/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP
+ segments. */
+#define MEMP_NUM_TCP_SEG 8
+/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active
+ timeouts. */
+#define MEMP_NUM_SYS_TIMEOUT 10
+
+
+/* ---------- Pbuf options ---------- */
+/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */
+#define PBUF_POOL_SIZE 8
+
+/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */
+#define PBUF_POOL_BUFSIZE 1524
+
+
+/* ---------- TCP options ---------- */
+#define LWIP_TCP 1
+#define TCP_TTL 255
+
+/* Controls if TCP should queue segments that arrive out of
+ order. Define to 0 if your device is low on memory. */
+#define TCP_QUEUE_OOSEQ 0
+
+/* TCP Maximum segment size. */
+#define TCP_MSS (1500 - 40) /* TCP_MSS = (Ethernet MTU - IP header size - TCP header size) */
+
+/* TCP sender buffer space (bytes). */
+#define TCP_SND_BUF (4*TCP_MSS)
+
+/* TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
+ as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. */
+
+#define TCP_SND_QUEUELEN (2* TCP_SND_BUF/TCP_MSS)
+
+/* TCP receive window. */
+#define TCP_WND (2*TCP_MSS)
+
+
+/* ---------- ICMP options ---------- */
+#define LWIP_ICMP 1
+
+
+/* ---------- DHCP options ---------- */
+#define LWIP_DHCP 1
+
+/* ---------- DNS options ---------- */
+#define LWIP_DNS 1
+
+
+/* ---------- UDP options ---------- */
+#define LWIP_UDP 1
+#define UDP_TTL 255
+
+
+/* ---------- Statistics options ---------- */
+#define LWIP_STATS 0
+
+/* ---------- link callback options ---------- */
+/* LWIP_NETIF_LINK_CALLBACK==1: Support a callback function from an interface
+ * whenever the link changes (i.e., link down)
+ */
+#define LWIP_NETIF_LINK_CALLBACK 1
+
+/*
+ --------------------------------------
+ ---------- Checksum options ----------
+ --------------------------------------
+*/
+
+/*
+The STM32F4x7 allows computing and verifying the IP, UDP, TCP and ICMP checksums by hardware:
+ - To use this feature let the following define uncommented.
+ - To disable it and process by CPU comment the the checksum.
+*/
+#define CHECKSUM_BY_HARDWARE
+
+
+#ifdef CHECKSUM_BY_HARDWARE
+ /* CHECKSUM_GEN_IP==0: Generate checksums by hardware for outgoing IP packets.*/
+ #define CHECKSUM_GEN_IP 0
+ /* CHECKSUM_GEN_UDP==0: Generate checksums by hardware for outgoing UDP packets.*/
+ #define CHECKSUM_GEN_UDP 0
+ /* CHECKSUM_GEN_TCP==0: Generate checksums by hardware for outgoing TCP packets.*/
+ #define CHECKSUM_GEN_TCP 0
+ /* CHECKSUM_CHECK_IP==0: Check checksums by hardware for incoming IP packets.*/
+ #define CHECKSUM_CHECK_IP 0
+ /* CHECKSUM_CHECK_UDP==0: Check checksums by hardware for incoming UDP packets.*/
+ #define CHECKSUM_CHECK_UDP 0
+ /* CHECKSUM_CHECK_TCP==0: Check checksums by hardware for incoming TCP packets.*/
+ #define CHECKSUM_CHECK_TCP 0
+ /* CHECKSUM_CHECK_ICMP==0: Check checksums by hardware for incoming ICMP packets.*/
+ #define CHECKSUM_GEN_ICMP 0
+#else
+ /* CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.*/
+ #define CHECKSUM_GEN_IP 1
+ /* CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.*/
+ #define CHECKSUM_GEN_UDP 1
+ /* CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.*/
+ #define CHECKSUM_GEN_TCP 1
+ /* CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.*/
+ #define CHECKSUM_CHECK_IP 1
+ /* CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.*/
+ #define CHECKSUM_CHECK_UDP 1
+ /* CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.*/
+ #define CHECKSUM_CHECK_TCP 1
+ /* CHECKSUM_CHECK_ICMP==1: Check checksums by hardware for incoming ICMP packets.*/
+ #define CHECKSUM_GEN_ICMP 1
+#endif
+
+
+/*
+ ----------------------------------------------
+ ---------- Sequential layer options ----------
+ ----------------------------------------------
+*/
+/**
+ * LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
+ */
+#define LWIP_NETCONN 0
+
+/*
+ ------------------------------------
+ ---------- Socket options ----------
+ ------------------------------------
+*/
+/**
+ * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
+ */
+#define LWIP_SOCKET 0
+
+/*
+ ------------------------------------
+ ---------- httpd options ----------
+ ------------------------------------
+*/
+
+/** Set this to 1 to support CGI */
+#define LWIP_HTTPD_CGI 1
+
+/** Set this to 1 to support SSI (Server-Side-Includes) */
+#define LWIP_HTTPD_SSI 1
+
+/** Set this to 1 to include "fsdata_custom.c" instead of "fsdata.c" for the
+ * file system (to prevent changing the file included in CVS) */
+#define HTTPD_USE_CUSTOM_FSDATA 1
+
+/*
+ ------------------------------------
+ ---------- Custom options ----------
+ ------------------------------------
+*/
+
+/** Enables the Ethernet peripheral in RMII mode. If not defined, MII mode will
+ be enabled. Pin mapping must be configured for the selected mode
+ (see PinMap_Ethernet in PeripheralPins.c). */
+#define ETHERNET_RMII_MODE_CONFIGURATION 1
+
+/** Uncomment this line to use the ethernet input in interrupt mode.
+ * NOTE: LwIP stack documentation recommends to use the polling mode without
+ * an operating system. */
+//#define ETH_INPUT_USE_IT 1
+
+#endif /* __LWIPOPTS_H__ */
+
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/