With the increasing popularity of Internet use, protecting personal privacy and security has become the focus of many users. As a common network tool, proxy servers are usually used to hide users' real IP addresses. However, in some cases, proxy servers may show users' real IPs. This article will explore in detail the reasons and related solutions for how proxy servers show real IPs.

1. What is a proxy server?

A proxy server is an intermediary server through which users access the Internet. When a user sends a request, the proxy server sends a request to the target website on behalf of the user and then returns the response to the user. The main functions of a proxy server include:

1. Hide real IP: Accessing the Internet through a proxy server can hide the user's real IP address.

2. Access restricted content: Proxy servers can help users bypass geographical restrictions and access websites in specific countries or regions.

3. Improve security: Using a proxy server in a public Wi-Fi environment can add additional security protection.

2. How does a proxy server show real IP

Although the main function of a proxy server is to hide the user's real IP, in some cases, the real IP may be leaked or displayed. Here are some common reasons:

1. Improper proxy configuration

If the proxy server is not set up correctly, the real IP may be leaked. For example:

- Not enabled proxy: If the user does not correctly enable the proxy settings in the browser or system, the traffic will be sent directly through the user's real IP address.

- Wrong proxy address or port: Using the wrong proxy server address or port may cause the request to not be forwarded through the proxy server.

2. Choice of proxy type

Different types of proxy servers behave differently when processing user requests:

- Transparent proxy: This proxy does not hide the user's real IP address, but instead includes the real IP information in the HTTP request header. Many ISPs (Internet service providers) and corporate networks use transparent proxies.

- High-anonymity proxy: This proxy completely hides the user's real IP address and is usually used for privacy protection. If a transparent proxy is used, the real IP will be displayed.

3. WebRTC leakage

WebRTC (Web Real-Time Communication) is a technology that supports browsers for real-time audio and video communication. In some cases, WebRTC may leak the user's real IP address, especially when using the browser's proxy settings. Even if you access a website through a proxy server, WebRTC may still connect directly to the user's real IP.

4. DNS Leakage

When using a proxy server, DNS requests may still be sent through the user's ISP instead of the proxy server. This situation is called DNS leakage and may cause the real IP address to be exposed. Users can detect DNS leakage by visiting some specific websites.

3. How to protect the real IP from being leaked

To ensure that the real IP can be effectively hidden when using a proxy server, users can take the following measures:

1. Use a high-anonymity proxy

Choose a high-anonymity (high-anonymity) proxy server instead of a transparent proxy. High-anonymity proxies do not include the user's real IP information in the request, which can better protect privacy.

2. Check proxy settings

Make sure the proxy settings are correctly configured in the browser or operating system. Check the proxy address and port regularly to ensure that the traffic is sent through the proxy server.

3. Disable WebRTC

For users who use a proxy server, consider disabling the WebRTC function in the browser to prevent the real IP from being leaked. Most modern browsers provide relevant setting options.

4. Use VPN

A virtual private network (VPN) is a tool that encrypts user network traffic and can effectively hide the real IP address. Compared with proxy servers, VPNs provide stronger privacy protection.

5. Check DNS leaks

Use tools to detect whether there is a DNS leak. If a DNS leak is found, users can solve this problem by changing DNS settings (such as using a public DNS service).

Proxy servers are an effective tool that can help users hide their real IP addresses and protect personal privacy. However, in some cases, the real IP may be leaked, mainly due to improper proxy configuration, use of transparent proxy, WebRTC leaks, and DNS leaks. To ensure privacy security, users should choose high-anonymous proxies, correctly configure proxy settings, disable WebRTC, use VPNs, and regularly check DNS leaks.

By taking these measures, users can better protect their online privacy and enjoy a safe Internet experience. While using proxy servers, understanding how they work and potential risks will help users stay safe and anonymous in a complex network environment.