How do I get a client's IP address from behind a load balancer?

Question

I am using TcpClient to listen on a port for requests. When the requests come in from the client I want to know the client ip making the request.

I've tried:

Console.WriteLine(tcpClient.Client.RemoteEndPoint.ToString()); Console.WriteLine(tcpClient.Client.LocalEndPoint.ToString()); var networkStream = tcpClient.GetStream(); var pi = networkStream.GetType().GetProperty("Socket", BindingFlags.NonPublic | BindingFlags.Instance); var socketIp = ((Socket)pi.GetValue(networkStream, null)).RemoteEndPoint.ToString(); Console.WriteLine(socketIp); 

All of these addresses output 10.x.x.x addresses which are private addresses and are clearly not the address of the clients off my network making the requests. What can I do to get the public ip of the clients making the requests?

Edit: We are using an Amazon EC2 Load Balancer with tcp forwarding. Is there a way to get the true client ip in this set up?

Answer 1

Does this work:

((IPEndPoint)tcpClient.Client.RemoteEndPoint).Address.ToString() 

If the client is connecting to you via an internal network I am not sure you can get their public IP since the connection to get back to the client would not need that information.