What is a proxy server?
If I tell you, use the proxy server to access the Internet, can accelerate access speed, you can access the site that cannot be directly accessed, you can partially solve the problem of the shortage of network IP addresses ... You must think that there is such an American in the world? If you can be patient to read the lengthy this article, you will be sure that the words I have said are not exaggerated. If the application is proper, you can save you a considerable Internet fee every month, you don't need to run to the Telecommunications Bureau for the Telecommunications Bureau. Fifty-five first put "hard-earned money" "donate" to ISP.
Agent server work mechanism
The working mechanism of the proxy server is very similar to the agents that are often mentioned in our lives. It is assumed that your own machine is the A machine, and the data you want to be provided by the server B, the proxy server is C, then the specific connection process is like this.
First, the A machine requires the data of the B machine, and a directly establishes a connection with the C machine. After the C machine receives the data request of the A machine, establish a connection with the B-machine, download the data on the B machine requested by the A machine to the local, will then This data is sent to the A machine to complete the agent task.
Reason for proxy server
Maybe you have to ask, why will it be so trouble? Is it not very good to build a machine and B machine? Please be patient to listen to me, using the proxy server, of course, there is a reasonable reason why it is:
1. The machine is not connected to the external network in the local area bureau to connect to the external network through the intranet. This example, the most convincing is the Internet solution of the small office, using the original local area network, as long as a telephone line, a legal account (on the ISP initial application to get the dial number and username and password), Plus a simple agent software (such as Sygate, Wingate, WinRouter) can easily connect the entire office computer with the internet with the smallest cost.
2, in order to get a larger speed, connect to the target host through the bandwidth larger proxy. Visiting Taiwan Site sites must have already taught it, if we use a proxy server in the United States (here, it is called the US agent server is because there is no direct connection between the second-strait network between the second shore. For example, a very classic proxy server proxy.golden.net:3000, you can feel very obvious that the improvement of connection speed will be unexpected. I saw such a very image of an example in the Internet. Now the original quote: "Because Proxy Serve is all located in a relatively close place. For example, if I want to watch Beijing in Hong Kong, I want to go to Beijing. Beijing Buying a copy, or buy a copy from the floor, two choices? Of course, the latter .proxy Serve is the kiosk, you want to see what is going to it, if you have it, You, if you don't go to a group, you will leave a copy. "
3. Different networks that are not interconnected in the same area are connected through the agent. Or the above listed proxy servers as an example, after setting the correct, we can access the site that is generally unable to access directly to Xoom, GEOCIAs. Of course, you need to remind you to restrict access to these sites, because these sites have some contents from our country's long-distance, so they have taken shielded measures. I hope everyone can pay attention to screen. This limitation is human, different proxy servers are different for the blockade of the address, so a try one can be changed when one is not.
4, you can access the Internet for free. This is the highlight of this article. The Internet has become an open secret with the free 169 account. However, until now, there is no complete "complete agent solution", so there is a proxy special introduction to this article. As we all know, there are two kinds of networks established by China Telecom. One is the real international Internet (because the dialer number is generally 163, commonly known as 163), and the other is the so-called Chinese public multimedia network (due to the call number It is generally 169, commonly known as 169). Take the Jiangsu area as an example, 169 users are divided into three categories. Class C users have network external rights, and can directly enjoy all services of the Internet; the other class B users, also known as registered users, use registered accounts Internet However, it can only be connected to the website of CNINFO.NET and the Guangdong Dynasty (the IP address begins with 10 start and 172); the third category is called a class of users, also known as guest users, using public accounts, take the main account The billing system, which is different from the Class B users on the billing standards (generally only charge the telephone bill). After reading this article, Class A and Class B users will save a big online fee, as long as the local city call is paid (provided the local opening 169 free account, such as the user's name Guest, password for the free account for Guest You can take the smallest price (huh, of course, you can't think about it. Everyone thinks about it. Oh, how can I remove the city call? Haha, if you read this article, you run to Telecom Board in the middle of the night. Deleting bills records are caught, don't blame me, don't you be too dark?)
Who sets a proxy server
Because the proxy server can alleviate the pressure of bandwidth and improve access speed to some extent, the two mechanisms are generally provided by the proxy server.
One: It is a large organ, business career, educational institution
Summary Time Safely know 169 network proxy servers from the government agency from connecting 169 networks. Of course, the proxy server on the education online is also quite.
Two: ISP
The former usually has money equipment line, which should be very fast, but because there are too many users, (for example, a 64K line, 500 terminals, speed is not as fast as dialing), and it is overwhelmed. At this time, a proxy solves the problem. Most information (statistics are more than 70%) are commonly used, and they can be read directly from local. Only a small amount of information is to be read from the outside world. It is naturally very fast. ISP pays for the traffic costs of the home can also save a lot, and users are also considerable to improve the network fee of the access speed. It is also the same as the ISP to provide Proxy, but the object faced is a restricted user using dial-up Internet.
How to set a proxy server in the software is the main part of this article.
First we must understand which types of proxy servers can be used.
Browser software can use HTTP or SOCKS4 or SOCKS5 proxy server
Download Software Use HTTP or FTP or SOCKS4 or SOCKS5 proxy server
As for the last page, you can use FTP or SOCKS4 or SOCKS5 proxy server.
Others need SOCKS4 or SOCKS5 proxy (collect mail, playing ICQ, MUD, etc.)
In addition, PROXY's port, common HTTP proxy (also the most used) ports are: 80, 8080, 8888, 3128, etc., SOCKS4 / 5 has 1080, FTP Proxy has 21, 2121, etc.
Author: John Bull
