Ethernet shield w5100 getting IP as 255.255.255.255

Projects Networking, Protocols, and Devices
1

Hi guys, check out the code that I'm using to assign IP address to my arduino ethernet shield:

#include <SPI.h>
#include <Ethernet.h>

// network configuration. dns server, gateway and subnet are optional.

 // the media access control (ethernet hardware) address for the shield:
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };  

// the dns server ip
IPAddress dnServer(150, 236, 18, 59);
// the router's gateway address:
IPAddress gateway(100, 96, 1, 1);
// the subnet:
IPAddress subnet(255, 255, 255, 0);

//the IP address is dependent on your network
IPAddress ip(100, 96, 1, 4);

void setup() {
  pinMode(4, OUTPUT);
  digitalWrite(4, HIGH);
  Serial.begin(9600);

  // initialize the ethernet device
  Ethernet.begin(mac, ip);
  //print out the IP address
  Serial.print("IP = ");
  Serial.println(Ethernet.localIP());
}

void loop() {
}

After uploading this, my output was:
IP = 255.255.255.255

Note: I've tried with Ethernet.begin(mac, ip, dns, gateway, subnet) also. It resulted in the same problem.
I was unsuccessful in getting the IP assigned dynamically using DhcpAddressPrinter.
I've checked the following links in the forum already:
W5100 Probleme ethernet
Ethernet Shield is not getting IP from DHCP
I Googled a lot, but, I couldn't solve my problem. I have two ethernet shields. Both of them are resulting into the same problem.
There was no MAC address sticker on my product, so I used the one specified in the Ethernet examples. I read in the forum somewhere that this doesn't usually matter unless more than one device on the network possesses the same MAC, of which the probability is low.
I request you guys to help me out with this.

Thanks,
Nikhil Clement

2

Do you know what is dynamic IP?
You got it.
Check you routrer settings for more information.

3

IPAddress ip(100, 96, 1, 4);

You ip configuration is very odd.This ip address is not valid to a private network ...
I doubt you router have dhcp configured to offer ips in this subnet.

4

Whether or not it is a valid IP, the code you posted should assign it.

Are you certain it is a w5100 IC? Can you post a link to that shield?

Do you have a SD card in the shield's slot? If so, remove it and try again, just as a test.

5

Hello,
Removing SD card it works, thanks! Do you now why? How can I use SD card?

6 
void setup()
{
   // disable SD SPI
   digitalWrite(4,HIGH);

   // disable w5100 SPI
   digitalWrite(10,HIGH);

   // rest of your setup code
}
7

Hello. I apologize for recycling an old post but I'm having the same issue, except that I don't have any SD card in the slot.
I'm using an Arduino UNO with an Ethernet Shield W5100.

I don't have the code right now but I tried with the one in the examples.

I tried disabling the SD by writing HIGH in the pin 4 and getting an IP from the router but none work but I keep getting 255.255.255.255 when I print the Ethernet.localIP() in the serial monitor.
When I assign an static IP I can ping it from my computer and I can also see it in the DHCP table of my router.

8

i have this problem
i test with code .... my shield ethernet w5100 does not get mac