RGB Proxy

In a local network, you will need two computers to do this. One will be used as a proxy server, the other as a client. Then you need to activate the proxy on the server. And on the client PC - choose to access the Internet via a local network connection (i.e. from the server). Another option is to use a web server like Nginx.

The first thing to do is to find a suitable proxy server with an IP address and port. Then you should check whether the proxy works by means of a special program or an online service providing such services. The next step is to configure the type of browser you are going to use. The procedure of setting itself depends on the type of browser and does not take much time. After correctly entering the IP address, username and password of the proxy server, don't forget to save the changes you made.

In WCF (Windows Communication Foundation), UDP communication is not supported directly as it is a point-to-point communication protocol. However, you can create a custom UDP duplex binding and use callbacks to send and receive data. Here's an example of how to do this:

1. Create a new WCF project or add a new service to an existing project.

2. Define the service contract for the UDP communication. For example:

[ServiceContract]
public interface IUdpService
{
    [OperationContract]
    void SendData(string data);

    [OperationContract]
    string ReceiveData();
}

3. Implement the service contract in a class:

public class UdpService : IUdpService
{
    private const int Port = 12345;
    private readonly UdpClient _udpClient = new UdpClient(Port);

    public void SendData(string data)
    {
        var bytes = Encoding.ASCII.GetBytes(data);
        _udpClient.Send(bytes, bytes.Length);
    }

    public string ReceiveData()
    {
        var bytes = _udpClient.Receive(ref EndPoint);
        var data = Encoding.ASCII.GetString(bytes);
        return data;
    }
}

4. Create a custom UDP duplex binding. Add the following code to a new class:

public class UdpDuplexBinding : Binding, IDisposable
{
    private UdpClient _udpClient;

    public UdpDuplexBinding()
    {
        _udpClient = new UdpClient();
    }

    public override void Close()
    {
        _udpClient?.Close();
    }

    public override void Dispose()
    {
        Close();
        GC.SuppressFinalize(this);
    }

    // Implement other required binding members
}

5. Implement a custom UdpDuplexSessionChannel for the UDP duplex binding. Add the following code to a new class:

public class UdpDuplexSessionChannel : DuplexSessionChannel
{
    private readonly UdpClient _udpClient;

    public UdpDuplexSessionChannel(UdpClient udpClient)
    {
        _udpClient = udpClient;
    }

    protected override void OnOpen(TimeSpan timeout)
    {
        base.OnOpen(timeout);
        _udpClient.EnableBroadcast = true;
    }

    protected override void OnClose()
    {
        _udpClient.Close();
        base.OnClose();
    }

    // Implement other required session channel members
}

6. Create a custom UdpDuplexSession for the UDP duplex binding. Add the following code to a new class:

public class UdpDuplex

To configure a proxy in Nginx, you need to modify the Nginx configuration file and add the appropriate proxy settings. Follow these steps to set up a proxy in Nginx:

Open the Nginx configuration file: This file is typically located at /etc/nginx/nginx.conf or /etc/nginx/conf.d/default.conf, depending on your system and Nginx installation. You may need root or administrative privileges to edit this file.

Locate the http block: Inside the Nginx configuration file, look for the http block, which contains the global settings for your Nginx server.

Add a server block: Within the http block, add a new server block that specifies the domain name or IP address and port number of the client request you want to proxy to another server. For example:

server {
    listen 80;
    server_name example.com;

    location / {
        proxy_pass http://your-destination-server.com;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
    }
}

Replace example.com with the domain name you want to proxy to the destination server, and http://your-destination-server.com with the destination server's address and port number.

Configure proxy settings: Within the location block, add the necessary proxy settings to forward the client's request to the destination server and pass along the appropriate headers. Some common proxy settings include:

- proxy_pass: Specifies the destination server's address and port number.
- proxy_set_header: Sets the value of specific headers to be sent to the destination server.
- proxy_redirect: Redirects URLs in the response from the destination server to a different URL.
- proxy_connect_timeout: Sets the timeout for establishing a connection to the destination server.
- proxy_read_timeout: Sets the timeout for reading the response from the destination server.
- proxy_send_timeout: Sets the timeout for sending a response to the client.

Save the configuration file: After making the necessary changes, save the Nginx configuration file.

Test the configuration: Before restarting Nginx, test the configuration to ensure there are no syntax errors. You can do this by running the following command:

nginx -t

If the test is successful, Nginx will output Configuration test successful.

Restart Nginx: Apply the changes by restarting the Nginx server. Depending on your system, you can use one of the following commands:

sudo service nginx restart

or

sudo systemctl restart nginx

After completing these steps, your Nginx server will act as a proxy and forward client requests to the specified destination server.

A proxy is a service that allows access to websites blocked in different countries, while hiding your own IP address. It is a kind of intermediary between the end server and the owner's computer. A VPN provides an encrypted connection to the network, which not only allows you to keep your privacy, hide your IP address, encrypt Internet traffic, but also bypasses firewalls.