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diff --git a/Marlin/src/feature/ethernet.cpp b/Marlin/src/feature/ethernet.cpp
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+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "../inc/MarlinConfigPre.h"
+
+#if HAS_ETHERNET
+
+#include "ethernet.h"
+#include "../core/serial.h"
+
+#define DEBUG_OUT ENABLED(DEBUG_ETHERNET)
+#include "../core/debug_out.h"
+
+bool MarlinEthernet::hardware_enabled, // = false
+     MarlinEthernet::have_telnet_client; // = false
+
+IPAddress MarlinEthernet::ip,
+          MarlinEthernet::myDns,
+          MarlinEthernet::gateway,
+          MarlinEthernet::subnet;
+
+EthernetClient  MarlinEthernet::telnetClient;  // connected client
+
+MarlinEthernet ethernet;
+
+EthernetServer server(23);    // telnet server
+
+enum linkStates { UNLINKED, LINKING, LINKED, CONNECTING, CONNECTED, NO_HARDWARE } linkState;
+
+#ifdef __IMXRT1062__
+
+  static void teensyMAC(uint8_t * const mac) {
+    const uint32_t m1 = HW_OCOTP_MAC1, m2 = HW_OCOTP_MAC0;
+    mac[0] = m1 >> 8;
+    mac[1] = m1 >> 0;
+    mac[2] = m2 >> 24;
+    mac[3] = m2 >> 16;
+    mac[4] = m2 >> 8;
+    mac[5] = m2 >> 0;
+  }
+
+#else
+
+  byte mac[] = MAC_ADDRESS;
+
+#endif
+
+void ethernet_cable_error() { SERIAL_ERROR_MSG("Ethernet cable is not connected."); }
+
+void MarlinEthernet::init() {
+  if (!hardware_enabled) return;
+
+  SERIAL_ECHO_MSG("Starting network...");
+
+  // Init the Ethernet device
+  #ifdef __IMXRT1062__
+    uint8_t mac[6];
+    teensyMAC(mac);
+  #endif
+
+  if (!ip) {
+    Ethernet.begin(mac); // use DHCP
+  }
+  else {
+    if (!gateway) {
+      gateway = ip;
+      gateway[3] = 1;
+      myDns = gateway;
+      subnet = IPAddress(255,255,255,0);
+    }
+    if (!myDns) myDns = gateway;
+    if (!subnet) subnet = IPAddress(255,255,255,0);
+    Ethernet.begin(mac, ip, myDns, gateway, subnet);
+  }
+
+  // Check for Ethernet hardware present
+  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
+    SERIAL_ERROR_MSG("No Ethernet hardware found.");
+    linkState = NO_HARDWARE;
+    return;
+  }
+
+  linkState = UNLINKED;
+
+  if (Ethernet.linkStatus() == LinkOFF)
+    ethernet_cable_error();
+}
+
+void MarlinEthernet::check() {
+  if (!hardware_enabled) return;
+
+  switch (linkState) {
+    case NO_HARDWARE:
+      break;
+
+    case UNLINKED:
+      if (Ethernet.linkStatus() == LinkOFF) break;
+
+      SERIAL_ECHOLNPGM("Ethernet cable connected");
+      server.begin();
+      linkState = LINKING;
+      break;
+
+    case LINKING:
+      if (!Ethernet.localIP()) break;
+
+      SERIAL_ECHOPGM("Successfully started telnet server with IP ");
+      MYSERIAL0.println(Ethernet.localIP());
+
+      linkState = LINKED;
+      break;
+
+    case LINKED:
+      if (Ethernet.linkStatus() == LinkOFF) {
+        ethernet_cable_error();
+        linkState = UNLINKED;
+        break;
+      }
+      telnetClient = server.accept();
+      if (telnetClient) linkState = CONNECTING;
+      break;
+
+    case CONNECTING:
+      telnetClient.println("Marlin " SHORT_BUILD_VERSION);
+      #if defined(STRING_DISTRIBUTION_DATE) && defined(STRING_CONFIG_H_AUTHOR)
+        telnetClient.println(
+          " Last Updated: " STRING_DISTRIBUTION_DATE
+          " | Author: " STRING_CONFIG_H_AUTHOR
+        );
+      #endif
+      telnetClient.println("Compiled: " __DATE__);
+
+      SERIAL_ECHOLNPGM("Client connected");
+      have_telnet_client = true;
+      linkState = CONNECTED;
+      break;
+
+    case CONNECTED:
+      if (telnetClient && !telnetClient.connected()) {
+        SERIAL_ECHOLNPGM("Client disconnected");
+        telnetClient.stop();
+        have_telnet_client = false;
+        linkState = LINKED;
+      }
+      if (Ethernet.linkStatus() == LinkOFF) {
+        ethernet_cable_error();
+        if (telnetClient) telnetClient.stop();
+        linkState = UNLINKED;
+      }
+      break;
+
+    default: break;
+  }
+}
+
+#endif // HAS_ETHERNET