When using a proxy server, the number of external IP addresses occupied by all users is generally several

When using a proxy server, the number of IP addresses occupied by all users is generally one; the function of the proxy server is to obtain network information on behalf of network users. It is an intermediary agency between personal networks and Internet service providers. Only occupying one IP can reduce network maintenance costs.

The operating environment of this tutorial: Windows 10 system, DELL G3 computer.

When using a proxy server, the number of external IP addresses occupied by all users is generally several.

The function of the proxy server (Proxy Server) is to obtain network information on behalf of network users. To put it figuratively, it is a transfer station for network information and an intermediary agency between personal networks and Internet service providers. It is responsible for forwarding legal network information, controlling and registering the forwarding.

When using a proxy server, all users only occupy one IP for external use, so there is no need to rent too many IP addresses and reduce network maintenance costs

Introduction to proxy server

As a bridge connecting the Internet and Intranet, the proxy server plays an extremely important role in practical applications. It can be used for multiple purposes. The most basic function is connection. In addition, it also includes security, caching, content filtering, Access control management and other functions. More importantly, the proxy server is an important security function provided by the Internet link-level gateway. It works mainly at the conversation layer of the Open Systems Interconnection (OSI) model.

Working Principle

The proxy server is an intermediate program that is both a server and a client. It is mainly used to forward network access requests from client systems. However, a proxy server does more than simply forward requests to a real Internet server. It can also control user behavior, make decisions about incoming client requests, and filter user requests based on filtering rules.

Through a proxy server, network administrators can implement stricter security policies than using packet filtering routers. Rather than using a general-purpose packet filtering router to manage the flow of Internet services through a firewall, a proxy server works by installing specialized code (a proxy service) on the gateway for each application that requires it. If the network administrator does not install the proxy service code for a particular service, the service will not be supported and corresponding client requests will not be forwarded through the firewall. Furthermore, the proxy server code can be configured to support only those features of a service that the network administrator deems acceptable, and not others.

Main Features

The proxy server has many features. For us individual users, accessing the Internet through a proxy allows us to access some websites that would be slower to access directly, such as Internet users accessing education network websites. For units, internal use of proxies can pre-filter some viruses to ensure Internet security, and can also effectively carry out access control, network speed limit, Internet monitoring, etc.

The following introduces the basic functions of the proxy server:

(1) One IP address or Internet account can be used by multiple users at the same time

In the current situation Under the circumstances, IP addresses are limited and valuable resources in the Internet. If these IP addresses are only used for a single user requesting Internet access, it cannot but be said to be a waste of resources. Using a proxy server can provide Internet access to multiple users at the same time through one IP. For an internal network connected to the Internet through telephone dial-up, you can use a phone line, a modem and an Internet account to provide all users on the internal network with Access the Internet at the same time, thus making full use of IP address resources.

(2) Caching function can reduce costs and increase speed

When installed, the proxy server will open a disk space on the hard disk as a cache area to store the proxy The user downloads a copy of the content received from the Internet and saves it. When another user accesses the same content, it is directly sent to the user from the cache instead of looking for it on the Internet. This function of the proxy server can greatly improve access speed and reduce communication costs. It is a very important function.

(3) Manage permissions and information traffic accounting for internal network users

Through the proxy server, network administrators can easily manage internal network users when providing Internet services. Network users manage access rights and information traffic accounting. Network administrators can not only allow only authorized LAN users to access the Internet, but can also control when and which computers these users use to access which types of Internet services. For users who have been allowed to access the Internet, network administrators can also perform billing management of information traffic in a variety of ways, such as billing based on individuals, billing based on computers belonging to departments, etc., which brings great convenience to network management. .

(4) Monitor and filter Internet information entering the internal network

In order to prevent information unrelated to business from entering the internal network and wasting communication fees, each organization often has some corresponding regulations on the content that is allowed to be accessed. Through the proxy server, network administrators can not only easily control the information content flowing from the Internet into the internal network through filtering, but also conduct real-time monitoring of users' access to the Internet and create audit logs for archiving for future reference.

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