Verified ENC and W5100 ethernet modules.

libraries/UIPEthernet_/examples/UdpServer/UdpServer.ino

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+/*
+ * UIPEthernet UdpServer example.
+ *
+ * UIPEthernet is a TCP/IP stack that can be used with a enc28j60 based
+ * Ethernet-shield.
+ *
+ * UIPEthernet uses the fine uIP stack by Adam Dunkels <adam@sics.se>
+ *
+ *      -----------------
+ *
+ * This UdpServer example sets up a udp-server at 192.168.0.6 on port 5000.
+ * send packet via upd to test
+ *
+ * Copyright (C) 2013 by Norbert Truchsess (norbert.truchsess@t-online.de)
+ */
+
+#include <SPI.h>
+#include <UIPEthernet.h>
+
+EthernetUDP udp;
+
+void setup() {
+
+  Serial.begin(9600);
+
+  uint8_t mac[6] = {0x00,0x01,0x02,0x03,0x04,0x05};
+
+  Ethernet.begin(mac,IPAddress(192,168,0,6));
+
+  int success = udp.begin(5000);
+
+  Serial.print("initialize: ");
+  Serial.println(success ? "success" : "failed");
+
+}
+
+void loop() {
+
+  //check for new udp-packet:
+  int size = udp.parsePacket();
+  if (size > 0) {
+    do
+      {
+        char* msg = (char*)malloc(size+1);
+        int len = udp.read(msg,size+1);
+        msg[len]=0;
+        Serial.print("received: '");
+        Serial.print(msg);
+        free(msg);
+      }
+    while ((size = udp.available())>0);
+    //finish reading this packet:
+    udp.flush();
+    Serial.println("'");
+    int success;
+    do
+      {
+        Serial.print("remote ip: ");
+        Serial.println(udp.remoteIP());
+        Serial.print("remote port: ");
+        Serial.println(udp.remotePort());
+        //send new packet back to ip/port of client. This also
+        //configures the current connection to ignore packets from
+        //other clients!
+        success = udp.beginPacket(udp.remoteIP(),udp.remotePort());
+        Serial.print("beginPacket: ");
+        Serial.println(success ? "success" : "failed");
+    //beginPacket fails if remote ethaddr is unknown. In this case an
+    //arp-request is send out first and beginPacket succeeds as soon
+    //the arp-response is received.
+      }
+    while (!success);
+
+    success = udp.println("hello world from arduino");
+
+    Serial.print("bytes written: ");
+    Serial.println(success);
+
+    success = udp.endPacket();
+
+    Serial.print("endPacket: ");
+    Serial.println(success ? "success" : "failed");
+
+    udp.stop();
+    //restart with new connection to receive packets from other clients
+    Serial.print("restart connection: ");
+    Serial.println (udp.begin(5000) ? "success" : "failed");
+  }
+}