---
title: "Arduino Ethernet W5100 ? how to fix the wrong board"
url: "https://maker.wiznet.io/taylor/projects/Arduino-Ethernet-W5100-how-to-fix-the-wrong-board/"
markdown_url: "https://maker.wiznet.io/taylor/projects/Arduino-Ethernet-W5100-how-to-fix-the-wrong-board/md"
type: "UCC: User Created Content"
author: "taylor"
author_url: "https://maker.wiznet.io/taylor/"
original_author: "taylor"
original_url: "https://reedpaper.wordpress.com/2018/09/17/arduino-ethernet-w5100-how-to-fix-the-wrong-board/"
published: "2021-06-07"
language: "en"
hardware: ["Arduino Ethernet Shield W5100"]
likes: 0
views: 368
comments: 0
source: "WIZnet Makers (https://maker.wiznet.io/)"
---

# Arduino Ethernet W5100 ? how to fix the wrong board

> Arduino Ethernet W5100 ? how to fix the wrong board

Original author: taylor (source: https://reedpaper.wordpress.com/2018/09/17/arduino-ethernet-w5100-how-to-fix-the-wrong-board/)

## Components

- **Arduino Ethernet Shield W5100** x 1

## Documents and links

- [W5100 Ethernet shield](https://reedpaper.files.wordpress.com/2018/09/ethernet_shield_sch.png) (schematics)

## Article

Original : <https://reedpaper.wordpress.com/2018/09/17/arduino-ethernet-w5100-how-to-fix-the-wrong-board/>

I continue to talk about cases of flaws in China-made modules and ways to fix them. This time we are talking about the clone of the?**Arduino Ethernet Shield W5100**.

Many users of such clones (Fig. 1) encountered an annoying problem: when connecting to some routers or using a long network cable, this shield can not establish a connection with the router or the communication is unstable, with large packet losses. Meanwhile, with another router model the same clone can work stably.

![](https://maker.wiznet.io/uploads/2021/06/wrong_w5100-300x201.jpg)

---

Source: https://maker.wiznet.io/taylor/projects/Arduino-Ethernet-W5100-how-to-fix-the-wrong-board/