ASP.NET Core 3.1 - How do I get a client's IP Address?

Question

I have a Razor Page Web Application and am logging users' IP addresses. For some reason it is returning an IP address but not the client's user IP Address. I believe it may be returning the IP from the server?

Note: I have added user logging in all of the other ASP.NET Web Forms applications and it's logging the correct IPs. This is our only ASP.NET Core application and it's returning a different IP.

Am I missing something in the ConfigureServices method that's preventing it from getting the users' ip address?

My code from the ConfigureServices method in the startup class:

public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<ForwardedHeadersOptions>(options =>
        {
            options.ForwardedHeaders =
            ForwardedHeaders.XForwardedFor | ForwardedHeaders.XForwardedProto;
        });

        services.AddRazorPages().AddRazorRuntimeCompilation();
        services.AddAntiforgery(option =>
        {
            option.HeaderName = "XSRF-TOKEN";
            option.SuppressXFrameOptionsHeader = false;
        });
        services.AddSession();
        services.AddMemoryCache();
    }

I am also calling the UserForwardedHeaders method in the Configure method as such:

app.UseForwardedHeaders();

I am using RemoteIPAddress when retrieving the IP Address:

 HttpContext.Connection.RemoteIpAddress.ToString() 

Answer 1

var ipAddr = HttpContext.Connection.RemoteIpAddress.ToString();

This will return {::1} when you execute the code at local. After deployment to the Test or Production server, it will get your client's IP

var deviceName = Dns.GetHostEntry(HttpContext.Connection.RemoteIpAddress).HostName;

It is for finding the Computer Name for the intr.net application.

Answer 2

This is what I did in .NET Core 2.1 ASP.NET MVC Application

public static string GetIpAddressFromHttpRequest(HttpRequest httpRequest)
{
  string ipAddressString = string.Empty;
  if (httpRequest == null)
  {
    return ipAddressString;
  }
  if (httpRequest.Headers != null && httpRequest.Headers.Count > 0)
  {
    if (httpRequest.Headers.ContainsKey("X-Forwarded-For") == true)
    {
      string headerXForwardedFor = httpRequest.Headers["X-Forwarded-For"];
      if (string.IsNullOrEmpty(headerXForwardedFor) == false)
      {
        string xForwardedForIpAddress = headerXForwardedFor.Split(':')[0];
        if (string.IsNullOrEmpty(xForwardedForIpAddress) == false)
        {
          ipAddressString = xForwardedForIpAddress;
        }
      }
    }
  }
  else if (httpRequest.HttpContext == null ||
       httpRequest.HttpContext.Connection == null ||
       httpRequest.HttpContext.Connection.RemoteIpAddress == null)
  {
       ipAddressString = httpRequest.HttpContext.Connection.RemoteIpAddress.ToString();
  }
  return ipAddressString;
}

My application working good in Google Chrome. I did not test in another browsers.