diff --git a/data-src/index.html b/data-src/index.html
index 0d9c41c..c2192c9 100644
--- a/data-src/index.html
+++ b/data-src/index.html
@@ -277,7 +277,7 @@
                 <div id="divNetworkSettings" style="display:none;">
                     <div class="subtab-container"><span class="selected" data-grpid="divNetAdapter">Adapter</span><span data-grpid="divDHCP">DHCP/Static IP</span><span data-grpid="divMQTT">MQTT</span></div>
                     <div id="divNetAdapter" class="subtab-content">
-                        <div class="field-group" style="vertical-align:middle;color:#00bcd4;margin-top:-24px;">
+                        <div id="divHardwired" class="field-group" style="vertical-align:middle;color:#00bcd4;margin-top:-24px;">
                             <input id="cbHardwired" name="hardwired" data-bind="ethernet.hardwired" type="checkbox" style="display:inline-block;" onclick="wifi.useEthernetClicked();" />
                             <label for="cbHardwired" style="display:inline-block;cursor:pointer;">Use Ethernet</label>
                             <div id="divFallbackWireless" style="display:inline-block;padding-left:7px;">
diff --git a/data-src/index.js b/data-src/index.js
index c1b65c3..6dd60fd 100644
--- a/data-src/index.js
+++ b/data-src/index.js
@@ -1750,7 +1750,8 @@ class Wifi {
     { val: 1, label: 'WT32-ETH01 - Wireless Tag', clk: 0, ct: 0, addr: 1, pwr: 16, mdc: 23, mdio: 18 }
     ];
     ethClockModes = [{ val: 0, label: 'GPIO0 IN' }, { val: 1, label: 'GPIO0 OUT' }, { val: 2, label: 'GPIO16 OUT' }, { val: 3, label: 'GPIO17 OUT' }];
-    ethPhyTypes = [{ val: 0, label: 'LAN8720' }, { val: 1, label: 'TLK110' }, { val: 2, label: 'RTL8201' }, { val: 3, label: 'DP83848' }, { val: 4, label: 'DM9051' }, { val: 5, label: 'KZ8081' }];
+    // The ids the firmware stores (eth_phy_id_t in EthPhy.h).  4 is the DM9051, an SPI chip the ESP32's MAC can't drive.
+    ethPhyTypes = [{ val: 0, label: 'LAN8720' }, { val: 1, label: 'TLK110' }, { val: 2, label: 'RTL8201' }, { val: 3, label: 'DP83848' }, { val: 5, label: 'KSZ8041' }, { val: 6, label: 'KSZ8081' }];
     init() {
         document.getElementById("divNetworkStrength").innerHTML = this.displaySignal(-100);
         if (this.initialized) return;
@@ -1811,8 +1812,11 @@ class Wifi {
                 ui.serviceError(err);
             }
             else {
-                document.getElementById('cbHardwired').checked = settings.connType >= 2;
-                document.getElementById('cbFallbackWireless').checked = settings.connType === 3;
+                // Firmware older than hasEthernet always built Ethernet in.
+                let hasEthernet = settings.hasEthernet !== false;
+                document.getElementById('divHardwired').style.display = hasEthernet ? '' : 'none';
+                document.getElementById('cbHardwired').checked = hasEthernet && settings.connType >= 2;
+                document.getElementById('cbFallbackWireless').checked = hasEthernet && settings.connType === 3;
                 ui.toElement(pnl, settings);
                 // The device never returns the stored passphrase; leave the field blank to keep it.
                 this.savedSsid = settings.wifi.ssid;
diff --git a/src/ConfigFile.cpp b/src/ConfigFile.cpp
index 468b73f..2d606e4 100644
--- a/src/ConfigFile.cpp
+++ b/src/ConfigFile.cpp
@@ -621,7 +621,7 @@ bool ShadeConfigFile::restoreFile(SomfyShadeController *s, const char *filename,
   if(opts.network) {
     settings.IP.save();
     settings.WIFI.save();
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
     settings.Ethernet.save();
 #endif
   }
@@ -679,9 +679,9 @@ bool ShadeConfigFile::readNetRecord(restore_options_t &opts) {
     if(opts.network) {
       if(strncmp(settings.serverId, this->header.serverId, sizeof(settings.serverId)) == 0) {
         ESP_LOGI(TAG, "Restoring Ethernet adapter settings");
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
         settings.Ethernet.boardType = this->readUInt8(1);
-        settings.Ethernet.phyType = static_cast<eth_phy_type_t>(this->readUInt8(0));
+        settings.Ethernet.phyType = this->readUInt8(0);
         settings.Ethernet.CLKMode = static_cast<eth_clock_mode_t>(this->readUInt8(0));
         settings.Ethernet.phyAddress = this->readInt8(1);
         settings.Ethernet.PWRPin = this->readInt8(1);
@@ -1048,9 +1048,9 @@ bool ShadeConfigFile::writeNetRecord() {
   this->writeBool(settings.MQTT.pubDisco);
   this->writeVarString(settings.MQTT.rootTopic);
   this->writeVarString(settings.MQTT.discoTopic);
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
   this->writeUInt8(settings.Ethernet.boardType);
-  this->writeUInt8(static_cast<uint8_t>(settings.Ethernet.phyType));
+  this->writeUInt8(settings.Ethernet.phyType);
   this->writeUInt8(static_cast<uint8_t>(settings.Ethernet.CLKMode));
   this->writeInt8(settings.Ethernet.phyAddress);
   this->writeInt8(settings.Ethernet.PWRPin);
diff --git a/src/ConfigSettings.cpp b/src/ConfigSettings.cpp
index f0745a4..2d6c851 100644
--- a/src/ConfigSettings.cpp
+++ b/src/ConfigSettings.cpp
@@ -181,7 +181,7 @@ bool ConfigSettings::begin() {
   this->Security.begin();
   this->IP.begin();
   this->WIFI.begin();
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
   this->Ethernet.begin();
 #endif
   this->NTP.begin();
@@ -255,7 +255,7 @@ void ConfigSettings::print() {
   ESP_LOGD(TAG, "Connection Type: %u", (unsigned int) this->connType);
   this->NTP.print();
   if(this->connType == conn_types_t::wifi || this->connType == conn_types_t::unset) this->WIFI.print();
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
   if(this->connType == conn_types_t::ethernet || this->connType == conn_types_t::ethernetpref) this->Ethernet.print();
 #endif
 }
@@ -601,7 +601,7 @@ bool WifiSettings::ssidExists(const char *ssid) {
   }
   return false;
 }
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
 EthernetSettings::EthernetSettings() {}
 bool EthernetSettings::begin() {
   this->load();
@@ -611,7 +611,7 @@ bool EthernetSettings::fromJSON(JsonObject &obj) {
   if(!obj["boardType"].isNull()) this->boardType = obj["boardType"];
   if(!obj["phyAddress"].isNull()) this->phyAddress = obj["phyAddress"];
   if(!obj["CLKMode"].isNull()) this->CLKMode = static_cast<eth_clock_mode_t>(obj["CLKMode"]);
-  if(!obj["phyType"].isNull()) this->phyType = static_cast<eth_phy_type_t>(obj["phyType"]);
+  if(!obj["phyType"].isNull()) this->phyType = obj["phyType"];
   if(!obj["PWRPin"].isNull()) this->PWRPin = obj["PWRPin"];
   if(!obj["MDCPin"].isNull()) this->MDCPin = obj["MDCPin"];
   if(!obj["MDIOPin"].isNull()) this->MDIOPin = obj["MDIOPin"];
@@ -621,7 +621,7 @@ bool EthernetSettings::toJSON(JsonObject &obj) {
   obj["boardType"] = this->boardType;
   obj["phyAddress"] = this->phyAddress;
   obj["CLKMode"] = static_cast<uint8_t>(this->CLKMode);
-  obj["phyType"] = static_cast<uint8_t>(this->phyType);
+  obj["phyType"] = this->phyType;
   obj["PWRPin"] = this->PWRPin;
   obj["MDCPin"] = this->MDCPin;
   obj["MDIOPin"] = this->MDIOPin;
@@ -642,7 +642,7 @@ bool EthernetSettings::save() {
   pref.clear();
   pref.putChar("boardType", this->boardType);
   pref.putChar("phyAddress", this->phyAddress);
-  pref.putChar("phyType", static_cast<uint8_t>(this->phyType));
+  pref.putChar("phyType", this->phyType);
   pref.putChar("CLKMode", static_cast<uint8_t>(this->CLKMode));
   pref.putChar("PWRPin", this->PWRPin);
   pref.putChar("MDCPin", this->MDCPin);
@@ -654,7 +654,7 @@ bool EthernetSettings::load() {
   Preferences pref;
   pref.begin("ETH");
   this->boardType = pref.getChar("boardType", this->boardType);
-  this->phyType = static_cast<eth_phy_type_t>(pref.getChar("phyType", ETH_PHY_LAN8720));
+  this->phyType = pref.getChar("phyType", this->phyType);
   this->CLKMode = static_cast<eth_clock_mode_t>(pref.getChar("CLKMode", ETH_CLOCK_GPIO0_IN));
   this->phyAddress = pref.getChar("phyAddress", this->phyAddress);
   this->PWRPin = pref.getChar("PWRPin", this->PWRPin);
@@ -667,7 +667,7 @@ void EthernetSettings::print() {
   ESP_LOGD(TAG, "Ethernet Settings Board:%d PHYType:%d CLK:%d ADDR:%d PWR:%d MDC:%d MDIO:%d",
     this->boardType, this->phyType, this->CLKMode, this->phyAddress, this->PWRPin, this->MDCPin, this->MDIOPin);
 }
-#endif // CONFIG_IDF_TARGET_ESP32C6
+#endif // HAS_ETHERNET
 void ConfigSettings::printAvailHeap() {
   ESP_LOGD(TAG, "Max Heap: %u", (unsigned int)ESP.getMaxAllocHeap());
   ESP_LOGD(TAG, "Free Heap: %u", (unsigned int)ESP.getFreeHeap());
diff --git a/src/ConfigSettings.h b/src/ConfigSettings.h
index 5af161c..7bcff67 100644
--- a/src/ConfigSettings.h
+++ b/src/ConfigSettings.h
@@ -1,7 +1,5 @@
 #include <ArduinoJson.h>
-#ifndef CONFIG_IDF_TARGET_ESP32C6
-#include <ETH.h>
-#endif
+#include "EthPhy.h"
 #ifndef configsettings_h
 #define configsettings_h
 #include "WResp.h"
@@ -94,17 +92,18 @@ class WifiSettings: BaseSettings {
     void print();
     
 };
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
 class EthernetSettings: BaseSettings {
   public:
     EthernetSettings();
     uint8_t boardType = 0; // These board types are enumerated in the ui and used to set the chip settings.
-    eth_phy_type_t phyType = ETH_PHY_LAN8720;
+    uint8_t phyType = static_cast<uint8_t>(eth_phy_id_t::LAN8720); // An eth_phy_id_t, see EthPhy.h.
     eth_clock_mode_t CLKMode = ETH_CLOCK_GPIO0_IN;
-    int8_t phyAddress = ETH_PHY_ADDR;
-    int8_t PWRPin = ETH_PHY_POWER;
-    int8_t MDCPin = ETH_PHY_MDC;
-    int8_t MDIOPin = ETH_PHY_MDIO;
+    // The LAN8720 wiring Arduino 2.x defaulted to.  3.x has no defaults.
+    int8_t phyAddress = 0;
+    int8_t PWRPin = -1;
+    int8_t MDCPin = 23;
+    int8_t MDIOPin = 18;
 
     bool begin();
     bool fromJSON(JsonObject &obj);
@@ -188,7 +187,7 @@ class ConfigSettings: BaseSettings {
     uint8_t status;
     IPSettings IP;
     WifiSettings WIFI;
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
     EthernetSettings Ethernet;
 #endif
     NTPSettings NTP;
diff --git a/src/ESPNetwork.cpp b/src/ESPNetwork.cpp
index e91c2a9..5125a9c 100644
--- a/src/ESPNetwork.cpp
+++ b/src/ESPNetwork.cpp
@@ -1,6 +1,3 @@
-#ifndef CONFIG_IDF_TARGET_ESP32C6
-#include <ETH.h>
-#endif
 #include <WiFi.h>
 #include <esp_wifi.h>
 #include <ESPmDNS.h>
@@ -65,11 +62,16 @@ conn_types_t ESPNetwork::preferredConnType() {
     case conn_types_t::unset:
     case conn_types_t::ap:
       return conn_types_t::ap;
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
     case conn_types_t::ethernetpref:
       return settings.WIFI.ssid[0] != '\0' && (!ETH.linkUp() && this->ethStarted) ? conn_types_t::wifi : conn_types_t::ethernet;
     case conn_types_t::ethernet:
       return ETH.linkUp() || !this->ethStarted ? conn_types_t::ethernet : conn_types_t::ap;
+#else
+    // Stored by a backup or an older UI on a chip without Ethernet.
+    case conn_types_t::ethernetpref:
+    case conn_types_t::ethernet:
+      return settings.WIFI.ssid[0] != '\0' ? conn_types_t::wifi : conn_types_t::ap;
 #endif
     default:
       return settings.connType; 
@@ -191,12 +193,12 @@ void ESPNetwork::emitSockets() {
   }
 }
 void ESPNetwork::emitSockets(uint8_t num) {
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
   if(this->connType == conn_types_t::ethernet) {
       JsonSockEvent *json = sockEmit.beginEmit("ethernet");
       json->beginObject();
       json->addElem("connected", this->connected());
-      json->addElem("speed", ETH.linkSpeed());
+      json->addElem("speed", (uint32_t)ETH.linkSpeed());
       json->addElem("fullduplex", ETH.fullDuplex());
       json->endObject();
       sockEmit.endEmit(num);
@@ -254,7 +256,7 @@ void ESPNetwork::setConnected(conn_types_t connType) {
     this->channel = WiFi.channel();
     this->connectAttempts++;
   }
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
   else if(this->connType == conn_types_t::ethernet) {
     if(this->softAPOpened) {
       ESP_LOGI(TAG, "Disconnecting from SoftAP");
@@ -265,7 +267,7 @@ void ESPNetwork::setConnected(conn_types_t connType) {
     this->_connecting = false;
     this->wifiFallback = false;
   }
-#endif // CONFIG_IDF_TARGET_ESP32C6
+#endif // HAS_ETHERNET
   // NET: Begin this in the startup.
   //sockEmit.begin();
   safe_wdt_reset();
@@ -281,7 +283,7 @@ void ESPNetwork::setConnected(conn_types_t connType) {
         settings.IP.dns2 = WiFi.dnsIP(1);
       }
     }
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
     else {
       ESP_LOGI(TAG, "Successfully Connected to Ethernet!!! %s%s %dMbps", ETH.localIP().toString().c_str(), ETH.fullDuplex() ? " FULL DUPLEX" : "", ETH.linkSpeed());
       if(settings.IP.dhcp) {
@@ -295,7 +297,7 @@ void ESPNetwork::setConnected(conn_types_t connType) {
       JsonSockEvent *json = sockEmit.beginEmit("ethernet");
       json->beginObject();
       json->addElem("connected", this->connected());
-      json->addElem("speed", ETH.linkSpeed());
+      json->addElem("speed", (uint32_t)ETH.linkSpeed());
       json->addElem("fullduplex", ETH.fullDuplex());
       json->endObject();
       sockEmit.endEmit();
@@ -307,7 +309,7 @@ void ESPNetwork::setConnected(conn_types_t connType) {
     if(this->connType == conn_types_t::wifi) {
       ESP_LOGI(TAG, "Reconnected after %.3fsec IP: %s %s CH:%d (%d dBm) Disconnected %d times", 1.0 * (millis() - this->connectStart)/1000, WiFi.localIP().toString().c_str(), this->mac.c_str(), this->channel, this->strength, this->connectAttempts - 1);
     }
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
     else {
       ESP_LOGI(TAG, "Reconnected after %.3fsec IP: %s%s %dMbps Disconnected %d times", 1.0 * (millis() - this->connectStart)/1000, ETH.localIP().toString().c_str(), ETH.fullDuplex() ? " FULL DUPLEX" : "", ETH.linkSpeed(), this->connectAttempts - 1);
     }
@@ -355,7 +357,7 @@ void ESPNetwork::setConnected(conn_types_t connType) {
   settings.printAvailHeap();
   this->needsBroadcast = true;
 }
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
 bool ESPNetwork::connectWired() {
   if(ETH.linkUp()) {
     // If the ethernet link is re-established then we need to shut down wifi.
@@ -389,7 +391,13 @@ bool ESPNetwork::connectWired() {
     else
       ETH.setHostname("ESPSomfy-RTS");
     ESP_LOGD(TAG, "Set hostname to: %s", ETH.getHostname());
-    if(!ETH.begin(settings.Ethernet.phyAddress, settings.Ethernet.PWRPin, settings.Ethernet.MDCPin, settings.Ethernet.MDIOPin, settings.Ethernet.phyType, settings.Ethernet.CLKMode)) {
+    eth_phy_type_t phyType;
+    bool begun = false;
+    if(!ethPhyType(settings.Ethernet.phyType, phyType))
+      ESP_LOGE(TAG, "Ethernet PHY type %u is not supported", (unsigned int)settings.Ethernet.phyType);
+    else
+      begun = ETH.begin(settings.Ethernet.phyAddress, settings.Ethernet.PWRPin, settings.Ethernet.MDCPin, settings.Ethernet.MDIOPin, phyType, settings.Ethernet.CLKMode);
+    if(!begun) {
       ESP_LOGE(TAG, "Ethernet Begin failed");
       this->ethStarted = false;
       if(settings.connType == conn_types_t::ethernetpref) {
@@ -412,10 +420,10 @@ bool ESPNetwork::connectWired() {
   this->connectStart = millis();
   return true;
 }
-#endif // CONFIG_IDF_TARGET_ESP32C6
+#endif // HAS_ETHERNET
 void ESPNetwork::updateHostname() {
   if(settings.hostname[0] != '\0' && this->connected()) {
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
     if(this->connType == conn_types_t::ethernet &&
       strcmp(settings.hostname, ETH.getHostname()) != 0) {
       ESP_LOGD(TAG, "Updating host name to %s...", settings.hostname);
@@ -511,7 +519,7 @@ bool ESPNetwork::connect(conn_types_t ctype) {
   esp_task_wdt_reset();
   if(this->connecting()) return true;
   if(this->disconnectTime == 0) this->disconnectTime = millis();
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
   if(ctype == conn_types_t::ethernet && this->connType != conn_types_t::ethernet) {
     // Here we need to call the connect to ethernet.
     this->connectWired();
@@ -588,7 +596,7 @@ bool ESPNetwork::connected() {
   if(this->connecting()) return false;
   else if(this->connType == conn_types_t::unset) return false;
   else if(this->connType == conn_types_t::wifi) return WiFi.status() == WL_CONNECTED;
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
   else if(this->connType == conn_types_t::ethernet) return ETH.linkUp();
 #endif
   else return this->connType != conn_types_t::unset;
@@ -635,7 +643,7 @@ void ESPNetwork::networkEvent(WiFiEvent_t event) {
       net.setConnected(conn_types_t::wifi);
       break;
     case ARDUINO_EVENT_WIFI_STA_LOST_IP:        ESP_LOGW(TAG, "Lost IP address and IP address is reset to 0"); break;
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
     case ARDUINO_EVENT_ETH_GOT_IP:
       // If the Wifi is connected then drop that connection
       if(WiFi.status() == WL_CONNECTED) WiFi.disconnect(true);
@@ -680,7 +688,7 @@ void ESPNetwork::networkEvent(WiFiEvent_t event) {
       net.softAPOpened = false;
       break;      
     default:
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
       if(event > ARDUINO_EVENT_ETH_START)
         ESP_LOGW(TAG, "(evt) Unknown Ethernet Event %d", event);
 #endif
diff --git a/src/EthPhy.h b/src/EthPhy.h
new file mode 100644
index 0000000..6b2ec46
--- /dev/null
+++ b/src/EthPhy.h
@@ -0,0 +1,45 @@
+#ifndef ETH_PHY_H
+#define ETH_PHY_H
+#include <stdint.h>
+#if __has_include(<sdkconfig.h>)
+#include <sdkconfig.h>
+#endif
+
+// Ethernet needs the RMII MAC, which only the original ESP32 has.  The C3, S3
+// and C6 build without it.
+#if defined(CONFIG_ETH_USE_ESP32_EMAC) && CONFIG_ETH_USE_ESP32_EMAC
+#define HAS_ETHERNET 1
+#else
+#define HAS_ETHERNET 0
+#endif
+
+// PHY chip ids as stored in NVS and backups and sent to the web UI.  They are
+// Arduino 2.x's eth_phy_type_t values, frozen: Arduino 3.x renumbered that
+// enum, so an id is translated by name when Ethernet starts, never cast.
+enum class eth_phy_id_t : uint8_t {
+  LAN8720 = 0,
+  TLK110 = 1,
+  RTL8201 = 2,
+  DP83848 = 3,
+  DM9051 = 4, // An SPI chip.  The RMII MAC can't drive it.
+  KSZ8041 = 5,
+  KSZ8081 = 6
+};
+
+#if HAS_ETHERNET
+#include <ETH.h>
+// Sets type to the framework's PHY for a stored id.  False for an id the RMII
+// MAC can't drive.
+inline bool ethPhyType(uint8_t id, eth_phy_type_t &type) {
+  switch(static_cast<eth_phy_id_t>(id)) {
+    case eth_phy_id_t::LAN8720: type = ETH_PHY_LAN8720; return true;
+    case eth_phy_id_t::TLK110: type = ETH_PHY_TLK110; return true;
+    case eth_phy_id_t::RTL8201: type = ETH_PHY_RTL8201; return true;
+    case eth_phy_id_t::DP83848: type = ETH_PHY_DP83848; return true;
+    case eth_phy_id_t::KSZ8041: type = ETH_PHY_KSZ8041; return true;
+    case eth_phy_id_t::KSZ8081: type = ETH_PHY_KSZ8081; return true;
+    default: return false;
+  }
+}
+#endif
+#endif
diff --git a/src/SSDP.cpp b/src/SSDP.cpp
index 7dd4a62..c7ef2c7 100644
--- a/src/SSDP.cpp
+++ b/src/SSDP.cpp
@@ -382,22 +382,11 @@ void SSDPClass::_parsePacket(ssdp_packet_t *pkt, AsyncUDPPacket &p) {
 }
 IPAddress SSDPClass::localIP()
 {
-    // Make sure we don't get a null IPAddress.
-#ifdef CONFIG_IDF_TARGET_ESP32C6
-    return WiFi.localIP();
-#else
-    tcpip_adapter_ip_info_t ip;
-    if (WiFi.getMode() == WIFI_STA) {
-        if (tcpip_adapter_get_ip_info(TCPIP_ADAPTER_IF_STA, &ip)) {
-            return IPAddress();
-        }
-    } else if (WiFi.getMode() == WIFI_OFF) {
-        if (tcpip_adapter_get_ip_info(TCPIP_ADAPTER_IF_ETH, &ip)) {
-            return IPAddress();
-        }
-    }
-    return IPAddress(ip.ip.addr);
+#if HAS_ETHERNET
+    // Wi-Fi is switched off while Ethernet is connected.
+    if (WiFi.getMode() == WIFI_OFF) return ETH.localIP();
 #endif
+    return WiFi.localIP();
 }    
 void SSDPClass::_sendResponse(IPAddress addr, uint16_t port, UPNPDeviceType *d, const char *st, response_types_t responseType) {
   char buffer[1460];
diff --git a/src/SomfyJson.cpp b/src/SomfyJson.cpp
index fe2902a..af6a53f 100644
--- a/src/SomfyJson.cpp
+++ b/src/SomfyJson.cpp
@@ -50,7 +50,7 @@ int8_t SomfyShade::validateJSON(JsonObject &obj) {
   pin_users_t radio, ethernet, others;
   if(somfy.transceiver.config.enabled)
     radio.uses = [](uint8_t pin, void *) { return somfy.transceiver.usesPin(pin); };
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
   if(settings.connType == conn_types_t::ethernet || settings.connType == conn_types_t::ethernetpref)
     ethernet.uses = [](uint8_t pin, void *) { return settings.Ethernet.usesPin(pin); };
 #endif
diff --git a/src/entryPoints/WebUiRoutes.cpp b/src/entryPoints/WebUiRoutes.cpp
index fc0ba55..9d7559f 100644
--- a/src/entryPoints/WebUiRoutes.cpp
+++ b/src/entryPoints/WebUiRoutes.cpp
@@ -802,7 +802,7 @@ void registerWebUiRoutes(AsyncWebServer &server) {
         JsonObject objEth = obj["ethernet"];
         if(settings.connType == conn_types_t::ethernet || settings.connType == conn_types_t::ethernetpref)
           reboot = true;
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
         settings.Ethernet.fromJSON(objEth);
         settings.Ethernet.save();
 #endif
@@ -886,8 +886,10 @@ void registerWebUiRoutes(AsyncWebServer &server) {
     JsonObject obj = doc.to<JsonObject>();
     settings.toJSON(obj);
     obj["fwVersion"] = settings.fwVersion.name;
+    // The web UI hides the Ethernet settings when the chip has no MAC.
+    obj["hasEthernet"] = HAS_ETHERNET == 1;
     JsonObject eth = obj.createNestedObject("ethernet");
-#ifndef CONFIG_IDF_TARGET_ESP32C6
+#if HAS_ETHERNET
     settings.Ethernet.toJSON(eth);
 #endif
     JsonObject wifi = obj.createNestedObject("wifi");
diff --git a/test/stubs/ETH.h b/test/stubs/ETH.h
new file mode 100644
index 0000000..c974957
--- /dev/null
+++ b/test/stubs/ETH.h
@@ -0,0 +1,16 @@
+// Stand-in for the Arduino core's ETH.h in the native test env.  Uses the
+// Arduino 3.x numbering, which put ETH_PHY_GENERIC first, so a stored PHY id
+// that is cast instead of translated fails the tests.
+#ifndef eth_stub_h
+#define eth_stub_h
+typedef enum {
+  ETH_PHY_GENERIC,
+  ETH_PHY_LAN8720,
+  ETH_PHY_TLK110,
+  ETH_PHY_RTL8201,
+  ETH_PHY_DP83848,
+  ETH_PHY_KSZ8041,
+  ETH_PHY_KSZ8081,
+  ETH_PHY_MAX
+} eth_phy_type_t;
+#endif
diff --git a/test/test_ethphy/test_ethphy.cpp b/test/test_ethphy/test_ethphy.cpp
new file mode 100644
index 0000000..08228d2
--- /dev/null
+++ b/test/test_ethphy/test_ethphy.cpp
@@ -0,0 +1,63 @@
+#include <unity.h>
+// As on the original ESP32, so the translation is built.
+#define CONFIG_ETH_USE_ESP32_EMAC 1
+#include "EthPhy.h"
+
+void setUp() {}
+void tearDown() {}
+
+static eth_phy_type_t translate(eth_phy_id_t id) {
+  eth_phy_type_t type = ETH_PHY_MAX;
+  TEST_ASSERT_TRUE(ethPhyType(static_cast<uint8_t>(id), type));
+  return type;
+}
+
+/*********************************************************************
+ * Stored ids
+ ********************************************************************/
+static void test_ids_match_stored_values() {
+  // NVS, backups and the web UI hold these numbers.  Changing one moves
+  // every existing Ethernet board to another chip.
+  TEST_ASSERT_EQUAL_UINT8(0, static_cast<uint8_t>(eth_phy_id_t::LAN8720));
+  TEST_ASSERT_EQUAL_UINT8(1, static_cast<uint8_t>(eth_phy_id_t::TLK110));
+  TEST_ASSERT_EQUAL_UINT8(2, static_cast<uint8_t>(eth_phy_id_t::RTL8201));
+  TEST_ASSERT_EQUAL_UINT8(3, static_cast<uint8_t>(eth_phy_id_t::DP83848));
+  TEST_ASSERT_EQUAL_UINT8(4, static_cast<uint8_t>(eth_phy_id_t::DM9051));
+  TEST_ASSERT_EQUAL_UINT8(5, static_cast<uint8_t>(eth_phy_id_t::KSZ8041));
+  TEST_ASSERT_EQUAL_UINT8(6, static_cast<uint8_t>(eth_phy_id_t::KSZ8081));
+}
+
+/*********************************************************************
+ * ethPhyType
+ ********************************************************************/
+static void test_translates_each_rmii_chip_by_name() {
+  TEST_ASSERT_EQUAL(ETH_PHY_LAN8720, translate(eth_phy_id_t::LAN8720));
+  TEST_ASSERT_EQUAL(ETH_PHY_TLK110, translate(eth_phy_id_t::TLK110));
+  TEST_ASSERT_EQUAL(ETH_PHY_RTL8201, translate(eth_phy_id_t::RTL8201));
+  TEST_ASSERT_EQUAL(ETH_PHY_DP83848, translate(eth_phy_id_t::DP83848));
+  TEST_ASSERT_EQUAL(ETH_PHY_KSZ8041, translate(eth_phy_id_t::KSZ8041));
+  TEST_ASSERT_EQUAL(ETH_PHY_KSZ8081, translate(eth_phy_id_t::KSZ8081));
+}
+static void test_lan8720_is_not_the_framework_zero() {
+  // The default board stores 0.  Arduino 3.x's 0 is ETH_PHY_GENERIC.
+  TEST_ASSERT_NOT_EQUAL(0, translate(eth_phy_id_t::LAN8720));
+}
+static void test_rejects_dm9051() {
+  eth_phy_type_t type = ETH_PHY_MAX;
+  TEST_ASSERT_FALSE(ethPhyType(static_cast<uint8_t>(eth_phy_id_t::DM9051), type));
+}
+static void test_rejects_unknown_ids() {
+  eth_phy_type_t type = ETH_PHY_MAX;
+  TEST_ASSERT_FALSE(ethPhyType(7, type));
+  TEST_ASSERT_FALSE(ethPhyType(255, type));
+}
+
+int main(int, char **) {
+  UNITY_BEGIN();
+  RUN_TEST(test_ids_match_stored_values);
+  RUN_TEST(test_translates_each_rmii_chip_by_name);
+  RUN_TEST(test_lan8720_is_not_the_framework_zero);
+  RUN_TEST(test_rejects_dm9051);
+  RUN_TEST(test_rejects_unknown_ids);
+  return UNITY_END();
+}