Only IPv6 router not working with ESP32

[dharmikP17]

I am using ESP32(2.0.9) with arduino IDE(2.0.2).
Board : ESP32-WROOM-32D.
I have an application where I only have IPv6 enabled in router and I want to post data over http.
I have test code for this where I am sending ping to google to see if it is working or not. Unfortunately it is returning -1. I have this code tested in different network where it returns 200.
Am I missing something ?

void setup() {
  Serial.begin(115200);
  delay(2000);
  WiFi.onEvent(WiFiEvent);
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(300);
    Serial.println(".");
  }
  Serial.println("wifi connected");
  delay(2000);
  
  HTTPClient http;
  http.begin("https://www.google.com/");
  int httpCode = http.GET();
  Serial.printf("HTTP code: %d\n", httpCode);
  http.end();
}

void loop() {

}

void WiFiEvent(WiFiEvent_t event) {
  switch (event) {
    case ARDUINO_EVENT_WIFI_STA_CONNECTED:
      Serial.println("Enabling IPv6");
      WiFi.enableIpV6();
      break;
    default:
      break;
  }
}

This is the debug message I got

[     4][D][esp32-hal-cpu.c:244] setCpuFrequencyMhz(): PLL: 480 / 2 = 240 Mhz, APB: 80000000 Hz
[  2053][D][WiFiGeneric.cpp:1035] _eventCallback(): Arduino Event: 0 - WIFI_READY
[  2144][D][WiFiGeneric.cpp:1035] _eventCallback(): Arduino Event: 2 - STA_START
[  2313][D][WiFiGeneric.cpp:1035] _eventCallback(): Arduino Event: 4 - STA_CONNECTED
Enabling IPv6
.
[  2620][D][WiFiGeneric.cpp:1035] _eventCallback(): Arduino Event: 7 - STA_GOT_IP
[  2620][D][WiFiGeneric.cpp:1098] _eventCallback(): STA IP: 192.168.1.3, MASK: 255.255.255.0, GW: 192.168.1.1
.
wifi connected
[  4035][D][WiFiGeneric.cpp:1035] _eventCallback(): Arduino Event: 8 - STA_GOT_IP6
[  4774][D][HTTPClient.cpp:263] beginInternal(): unexpected protocol: https, expected http
[  4775][D][HTTPClient.cpp:303] beginInternal(): protocol: https, host: www.google.com port: 443 url: /
[  4781][D][HTTPClient.cpp:598] sendRequest(): request type: 'GET' redirCount: 0

[  5035][D][WiFiGeneric.cpp:1035] _eventCallback(): Arduino Event: 8 - STA_GOT_IP6
[  9829][I][ssl_client.cpp:112] start_ssl_client(): select returned due to timeout 5000 ms for fd 48
[  9830][E][WiFiClientSecure.cpp:144] connect(): start_ssl_client: -1
[  9833][D][HTTPClient.cpp:1163] connect(): failed connect to www.google.com:443
[  9840][W][HTTPClient.cpp:1483] returnError(): error(-1): connection refused
HTTP code: -1
[  9858][D][HTTPClient.cpp:408] disconnect(): tcp is closed

[mrengineer7777]

Known issue. IPv6 and DNS resolution are not supported yet in Arduino-ESP32. Please check issues (open and closed) and open PRs.

[dharmikP17]

Where support is available ? On which platforms ?

[Jason2866]

Our Tasmota fork supports IPv6. Built to be used with Platformio.
See here https://github.com/tasmota/platform-espressif32

[rajmehta28599]

Follow this #7722 PR