What configuration settings do I need to change on my computer to use the ethernet shield mounted on my Arduino UNO as I don't want to connect the ethernet shield to the router?

  • That depends entirely on the settings you have on the Arduino. Also note a special cross-over cable may be required.
    – Majenko
    Commented Apr 4, 2016 at 8:39
  • What ethernet library do you use one the Arduino? And what is your network configuration? And what is the type of your Ethernet Shield?
    – zx485
    Commented Dec 1, 2016 at 19:05
  • Why wouldn't you want to connect it to the router? It's not directly accessible from the internet by doing so.
    – aaa
    Commented Dec 1, 2016 at 19:31
  • And what operating system are you using? (Windows/Linux/MacOS)
    – aaa
    Commented Dec 1, 2016 at 19:32

2 Answers 2


First off you need a basic understanding of TCP/IP networking. One you have that you need to:

  1. Allocate yourself a new subnet - one that's not your normal local network (say
  2. Assign an IP in that subnet to your Arduino (say
  3. Assign a different IP in that subnet to your PC (say
  4. Configure your Arduino's sketch with it's IP address and netmask
  5. Configure the PC's Ethernet interface with it's IP address and netmask
  6. Connect the two together with a suitable cable. If the PC's Ethernet port doesn't have auto-direction sensing you will require a special cross-over cable where TX+/TX- and RX+/RX- are swapped over.

You can try the easy way This always works for me :D

  1. Connect the shield to the Arduino and plug in the cables to the PC(RJ45/Ethernet).
  2. Go to network communication center.
  3. Go to change adapter settings.
  4. Select Ethernet(Arduino) and wireless(Wifi) /(internet source) and right click.
  5. Click bridge connections.
  6. Wait for a few seconds.
  7. Enjoy.

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