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

c# .net tcpclient
brendan picture brendan · Apr 27, 2010 · Viewed 80.5k times · Source

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

Kelsey picture Kelsey · Apr 27, 2010

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.

Related questions

In C#, how to check if a TCP port is available?

In C# to use a TcpClient or generally to connect to a socket how can I first check if a certain port is free on my machine? more info: This is the code I use: TcpClient c; //I want to …

Read More
What is the correct way to read from NetworkStream in .NET

I've been struggling with this and can't find a reason why my code is failing to properly read from a TCP server I've also written. I'm using the TcpClient class and its GetStream() method but something is not working as …

Read More
Loop until TcpClient response fully read

I have written a simple TCP client and server. The problem lies with the client. I'm having some trouble reading the entire response from the server. I must let the thread sleep to allow all the data be sent. I've …

Read More