An incomplete introduction to proxy servers

Source: http://blog.yesky.com

Some netizens always ask questions about how to use the proxy server. Now I want to summarize it and hope it will help you. If any error occurs, please correct it!

[Entry] [elementary] [intermediate] [advanced]

1. What is a proxy server?

The Proxy Server is used by the Proxy network users to obtain network information. It is a transfer station for network information. In general, when we use a web browser to directly connect to other Internet sites to obtain network information, we must send a Request signal to obtain the answer, and then the other Party sends the information back in bit mode. The proxy server is a server between the browser and the Web server. With this server, the browser does not directly go to the Web server to retrieve the Web page, but sends a request to the proxy server, the Request signal will be sent to the proxy server first. The proxy server will retrieve the information required by the browser and send it to your browser. In addition, most proxy servers have the buffer function, which is like a large Cache, which has a large storage space and constantly stores new acquired data in its local memory, if the data requested by the browser already exists and is up-to-date on its local memory, it will not retrieve data from the Web server again, directly transfer the data in the memory to the user's browser, which can significantly improve the browsing speed and efficiency. More importantly, the proxy server is an important security function provided by the Internet link-level gateway. Its work mainly lies in the dialog layer of the Open System Interconnection (OSI) model.

Ii. Benefits of Using proxy servers

1. Access websites outside China. CERNET, 169, and other network users can access foreign websites through proxy.
2. access resources in some organizations or groups, such as a University FTP (provided that the proxy address is within the permitted access range of the resource), use the free proxy server of the address segment in the education network, it can be used to download and upload various types of FTP files open to CERNET, as well as various types of data query and sharing services.
3. Break through China Telecom's IP address blocking: many websites of China Telecom users are restricted to access. Such restrictions are artificial, and the address blocking by different Serve is different. So you can try another foreign proxy server if you cannot access it.
4. increase access speed: Usually the proxy server sets a large hard disk buffer. When external information passes through, it is also saved to the buffer, when other users access the same information again, the information is directly retrieved from the buffer and transmitted to the user to Improve the access speed.
5. Hide real IP addresses: netusers can also hide their own IP addresses in this way to avoid attacks.

[Preliminary]

Iii. Proxy Server Settings
1. How to Set proxy servers in Internet Explorer 5.0 and later
Select "Tools"> "Internet Options"> "connection"> "Settings"> "use proxy server" on the main menu. Then, enter the proxy server address and port you have found.

For LAN users, click "local domain Settings" under the "connection" tab to set the proxy.

2. How to Set proxy servers in FlashGet
Click "Tools"> "options"> "proxy"> "add", and fill in the proxy server address and port (3 ). The proxy settings for most software downloads are similar to those for Internet ant Financial.

[Intermediate]

4. How to find a good proxy
1. Generally, you will not tell others about the proxy servers that you often use, because when you use more people, the speed will naturally be slow. However, many websites and BBS provide free Proxy server addresses on the Internet. You can use a search engine (such as Google, Sohu, and Sina) to check Proxy or free Proxy, you can find many similar websites.
2. When it comes to search Agent software, the first online help instruction by the Agent Hunter is displayed. Even if you are using it for the first time, you can easily control it. Let's talk about it here.
(1) Add as many proxy lists as possible and save them as a text file in the following format:
10.11.12.123: 80 @ http
10.11.12.123: 21 @ ftp
10.11.12.123: 1080 @ socket4
...........
(The above addresses are all examples)
(2) Use the proxy hunter to go to the "Search Results" Page and click "Import results" to import the text file list.
(3) Click "system"> "parameter settings" and set the two timeout parameters in "Verification Settings" on the "Search verification Settings" page.
(4) online verification.

5. What kind of proxy is
Free, fast, and stable.

There are many factors that determine the speed of a proxy:
1. The network of the Free proxy server. The main purpose of proxy is to go abroad. Therefore, the bandwidth of the egress bureaus of the four major networks directly determines the proxy speed.
2. Proxy server performance. As mentioned above, proxy is just a large cache, so its hard disk size and network bandwidth will affect the speed. This is the same as your own machine.
3. The distance between the proxy server and your host. Proxy is mainly used for specific objects, and its geographical distribution is usually not too wide. The longer the distance, the slower the speed.
4. The website you are visiting. This is also the reason that affects the proxy speed. If you want to access the website of the other party, you must use the standard of the other party, just like the Modem with different speeds. Unfortunately, many netizens often ignore this.

[Advanced]

Specific applications:
1. QQ agent
This is needless to say. We generally use a cracked version with built-in proxy functions.

2. Foxmail uses proxy (ScoksCap is required)
Because FoxMail does not support proxy (5.0 has never been used), all CERNET and 169 users cannot use it to receive emails from foreign E-mail. In this case, you can use sockscap to solve the problem.
Find a handy Socks proxy and drag the FoxMail shortcut to the blank box of SocksCap through an accessible Socks proxy (Socks5 or Sock4 proxy, your Foxmail can be unobstructed. The same method is also applicable to Cterm, Sterm, and other Telnet software access to the BBS sites in CERNET, speeding up the process and hiding real IP addresses. (Sometimes the server address cannot be resolved. You can run the ping pop.mail.yahoo.com command first, and then enter the resolved IP address in the POP3 server option of Foxmal)

3. Access the blocked website
For some reason, China Telecom has blocked some foreign websites, and all domestic users are not allowed to access them. Some foreign websites prohibit access from Chinese IP addresses, the solution is to use a foreign proxy server. However, CERNET users cannot access foreign websites, and all foreign agents cannot be used. You can refer to the following method to use secondary agents.
(1) install SocksCap and fill in the Socks proxy server address in the settings.
(2) drag the shortcut of the browser to the blank box of SocksCap. After the network is connected, start Sockscap. Enter the address of the foreign proxy server in the browser and run the browser in SocksCap.