Why does ethernet give 0.0.0.0 ip?

Question

Arduino

Good afternoon :)
I bought myself a separate Ethernet for Arduino Uno. And I get something 0.0.0.0 IP. What could be the problem?
https://ru.aliexpress.com/item/Mini-ENC28J60-Ether...

Answer 1

DHCP

Answer 2

Perhaps your source code is sharpened to work with DHCP and expects an ip address from it, but this DHCP itself is not physically in your network.
Or in the source code for the sketch that you upload to the arduino, you need to manually set the ip.

Answer 3

in the sketch itself, you need to write ip for arduino, at least I did this for ethernet shield
part of an example of one of my sketches, the
#include
#include LED
= 4 blinked through the browser;
byte mac[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; //physical mac address
byte ip[] = {
192, 168, 1, 7 }; // ip in lan (that's what you need to use in your browser. ("192.168.1.178")
byte gateway[] = {
192, 168, 1, 1 }; // internet access via router
byte subnet[] = {
255, 255, 255, 0 }; //subnet mask
EthernetServer server(80); //server port
String readString;