arduino uno and ethernet shield

hi,
i have arduino uno , ethernet shield
i load , run example dhcp...
the program runs , ip

what problem

the conection on network is

1) arduino ethernet > switcha 8p 10/100 > switchb 16p 10/100 (into rack) > internet rooter (this dhcp)

when use above connection shild not ip

when connect direct switchb ip
my computer , 3 other computers connected on switcha , ip dhcp

i have change switcha other had same problem.

using other ethernet pcb 28jxxx on (and libraries this) ip 1 connection
i use mac address pc ethernet card , not use more.
the host name wiznet624573

the arduino ide vesrion 1.63

so problem must @ ethernet library

do have suggestion?

kalarakis

i have seen reports of switches not passing or not responding dhcp request. switches , routers work fine multiple switches between ethernet shield , dhcp server.

try test. repeat dhcp request until gets response. ip on subsequent requests?

code: [select]

#include <spi.h>
#include <ethernet.h>

// enter mac address controller below.
// newer ethernet shields have mac address printed on sticker on shield
byte mac[] = {
  0x00, 0xaa, 0xbb, 0xcc, 0xde, 0x02
};

void setup() {
  // open serial communications , wait port open:
  serial.begin(9600);
  // check needed on leonardo:
  while (!serial) {
    ; // wait serial port connect. needed leonardo only
  }

  // start ethernet connection:
  while(ethernet.begin(mac) == 0) {
    serial.print("dhcp failed");
    delay(1000);
    serial.println("...trying again");
  }
  // print local ip address:
  serial.print("my ip address: ");
  (byte thisbyte = 0; thisbyte < 4; thisbyte++) {
    // print value of each byte of ip address:
    serial.print(ethernet.localip()[thisbyte], dec);
    serial.print(".");
  }
  serial.println();
}

void loop() {

}

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