Problem to connect Ethernet Shield/Leonardo to the Ethernet port of laptop

Using Arduino Interfacing w/ Software on the Computer
1

Hi,
I'm having problem to connect directly to my laptop an ethernet shield, with a crossed RJ45.

I have created a client on my leonardo, and a java server, on which it connects, in order to get the signal of a sensor.
What is odd, is that when I connect the Ethernet Shield on my box, it works correctly.

I have have also created a Java client on my laptop, and a server on my leonardo, and this works in all cases.

Here is my Java server :

import java.io.*;
import java.net.*;


public class Serveur {	
	
	public static void main(String args[]) throws IOException{
		int port=24000;
		ServerSocket sersoc = new ServerSocket(port);
		System.out.println("Server listening port : "+port);
		Socket soc=sersoc.accept();
		InputStream stream=soc.getInputStream();
		BufferedReader entree = new BufferedReader(new InputStreamReader(stream));
		String message;
		while(true){
			message=entree.readLine();
			System.out.println("Message received : "+message);
		}
	}
}

My Arduino client

#include <SPI.h>
#include <Ethernet.h>
 
/* Détails technique de la connexion ethernet */
byte mac[] = {0x00, 0x90, 0xF5, 0xE5, 0x2E, 0x42 };
//byte ip[] = {192,168,1,200 };    // Here are the addresses to connect on wifi box, it works perfectly
//byte server[] = {192,168,1,42};
byte ip[] = {169,254,192,124};    // The adresses used to connect directly with RJ45 on laptop
byte server[] = {169,254,192,123};


const int capteurIR = 3;
const int ledV = 9;
const int ledR = 8;

int etat=HIGH;
boolean b=false;

EthernetClient client;

 
void setup(){
  pinMode(ledV, OUTPUT);
  pinMode(ledR, OUTPUT);
  digitalWrite(ledV,HIGH);
  digitalWrite(ledR,HIGH);
  attachInterrupt(0, react, FALLING); // Utilisation interruption 0, ie. la broche 3
  Ethernet.begin(mac, ip);
  
  client.connect(server, 24000);
  
  delay(5000);
  
  if (client.connected()) {
    client.println("Arduino Connecte");
    etat=LOW;
    digitalWrite(ledV,etat);
  }
  else{    
    digitalWrite(ledR,LOW);
  }
}

void loop(){
  digitalWrite(ledV,etat);
  if(b){
    b=false;
    client.println("Objet détecté");
  }
}

void react(){
  etat=!etat;
  b=true;
}

And also my client on Java and server for Arduino

import java.net.*;
import java.util.Scanner;
import java.io.*;

public class Client {
	
	public static void main(String args[]) throws IOException{
		String hote = "169.254.192.124";
		int port =18001;
		Socket soc =new Socket(hote, port);
		PrintStream writer = new PrintStream(soc.getOutputStream());
		while(true){
			Byte c;
			Scanner s=new Scanner(System.in);
			System.out.println("Order?");
			System.out.println("1-Led on");
			System.out.println("2-Led off");
			System.out.println("Else-Quit");
			c=s.nextByte();
			if(c==1){
				writer.write(0x31);
				writer.flush();
			}
			else if(c==2){
				writer.write(0x32);
				writer.flush();
			}
			else{
				System.out.println("Disconnection");
				break;
			}
			System.out.println("Message sent to server");
		}
	}
}

#include <Ethernet.h>
 
/* Détails technique de la connexion ethernet */
byte mac[] = {0x90, 0xA2, 0xDA, 0x0E, 0xC0, 0x54 };
//byte mac[] = {0x00, 0x90, 0xF5, 0xE5, 0x2E, 0x42 };
byte ip[] = {169,254,192, 124 };
//byte gateway[] = {192,168,1, 1 };
 
// Attachement d'un objet "server" sur le port 1337
EthernetServer server(18001);
 
void setup()
{
  // Configuration de la ethernet shield et du server
  //Ethernet.begin(mac, ip, gateway);
  Ethernet.begin(mac, ip);
  server.begin();
 
  // Mise en sortie de la broche avec notre led (par défaut allumé)
  pinMode(9, OUTPUT);
  digitalWrite(9, LOW);
}
 
void loop()
{
  EthernetClient client = server.available();
  if (client && client.connected()) {
    if (client.available() > 0) {
      switch(client.read()){
      case '1': // led on
        digitalWrite(9, LOW);
        break;
      case '2': // led off
        digitalWrite(9, HIGH);
        break;
      }
    }
  }
}

Has I said, everything works correctly, except when I use a client on Arduino, a server on my laptop, and the arduino and laptop are directly connected by RJ45. It must be an IP adress problem, but I tried many things by modifying IP addresses, and nothing worked.