Well, there was no equivalent on Windows when we implemented that. Did anything changed ?

I do not know what library you used, but using Qt5 when I do data streaming in UDP multicast I can select the network interface to bind to.

However if under Windows you cannot use "multicast-iface" it should be indicated in the documentation to avoid to waste time trying to understand what is not working ;)

We're just using GLib API, and GLib has support for this on Windows. I know of people successfully using this property on Windows.

See https://gitlab.gnome.org/GNOME/glib/blob/6acece5074d00f54c65a018498d9913664fa52ba/gio/gsocket.c#L2210-2214

So the question is why this code does not work. Can you check inside the GLib code what happens there for your case?

Also what interface name do you use? There are multiple different classes of interface names on Windows, you need to use the correct one here.

In Windows usually the interface name is the one you see using the "ipconfig" command, but I tried all the solution that I found without any result.

You have to use a name that if_nametoindex() can take, see https://msdn.microsoft.com/en-us/library/windows/desktop/bb408409(v=vs.85).aspx

IIRC those looked like UNIX interface names. A compatible implementation of if_nametoindex() is the following, that should help to find the correct name.


static guint
if_nametoindex (const gchar *iface)
{
  PIP_ADAPTER_ADDRESSES addresses = NULL, p;
  gulong addresses_len = 0;
  guint idx = 0;
  DWORD res;

  if (ws2funcs.pIfNameToIndex != NULL)
    return ws2funcs.pIfNameToIndex (iface);

  res = GetAdaptersAddresses (AF_UNSPEC, 0, NULL, NULL, &addresses_len);
  if (res != NO_ERROR && res != ERROR_BUFFER_OVERFLOW)
    {
      if (res == ERROR_NO_DATA)
        errno = ENXIO;
      else
        errno = EINVAL;
      return 0;
    }

  addresses = g_malloc (addresses_len);
  res = GetAdaptersAddresses (AF_UNSPEC, 0, NULL, addresses, &addresses_len);

  if (res != NO_ERROR)
    {
      g_free (addresses);
      if (res == ERROR_NO_DATA)
        errno = ENXIO;
      else
        errno = EINVAL;
      return 0;
    }

  p = addresses;
  while (p)
    {
      if (strcmp (p->AdapterName, iface) == 0)
        {
          idx = p->IfIndex;
          break;
        }
      p = p->Next;
    }

  if (p == NULL)
    errno = ENXIO;

  g_free (addresses);

  return idx;
}

Ok, that's an approach to follow if you code the pipeline, but if you run it by command line how can you solve the problem?

You use the correct name. There's probably some Windows tool to print it for you

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