Ethernet shield returns Unknown IP address: 64.0.0.16

Projects Networking, Protocols, and Devices
1

Lately, my Arduino Ethernet shield has taken to returning an IP address of 64.0.0.16 even when using the standard Arduino Ethernet script setting the IP address as 192.168.1.177. I have no clue as to why this is happening. Any ideas?

2

I have no clue as to why this is happening. Any ideas?

Must be something in your code or your network. We can't see either one.

3

In addition to PaulS, do you have any other SPI hardware connected? Maybe a SD card in the shield's slot?

4

When the problem first arose, I took it all back to basics without success.

I just kept copying the standard code off this site using "Get Code" :

There are no other sensors or anything else connected. It has an SD card but I get the same result if the card is in or out and if the additional code is added or not:

pinMode(4, OUTPUT);
digitalWrite(4, HIGH);.

I have tried it with and without the for loop:

for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
client.print("analog input ");
client.print(analogChannel);
client.print(" is ");
client.print(sensorReading);
client.println("
");
}

That is I have tested every combination - card in and out, pin mode setting in and out and for loop in and out

This is what I have coded "IPAddress ip(192, 168, 1, 177);" as per the website.

This is what I get "server is at 64.0.0.16" on the serial monitor.

I am no expert but I have been able to work out every issue I've come across since picking up an Arduino. But this one has me stumped.

5

Does your ethernet shield have a w5100 IC on it? Some have w5200, w5500, or enc28j60 controllers.

6

This is what I have coded "IPAddress ip(192, 168, 1, 177);" as per the website.

This is what I get "server is at 64.0.0.16" on the serial monitor.

So, the client has one address and the server has another. Why is that a problem? It is what I would expect.

7

My mistake Paul. I thought when you coded:

IPAddress ip(192, 168, 1, 177);
EthernetServer server(80);

then

Serial.print("server is at ");
Serial.println(Ethernet.localIP());

you'd get "server is at 192.168.1.177" not "server is at 64.0.0.16"

Anyway, that's what I am getting now. I reset the router to factory settings, reloaded Arduino 1.6.5 and it now seems to work. I get server at 192.168.1.177 and if I put that IP address in the search bar, I can read the web page. Thanks for taking the time.

8

Perhaps now you can see why we ask you to post your code. It was not clear that you were running the Arduino as a server.