what is a proxy server?What are the functions of the proxy server?
what is the Proxy Server
Proxy Server (Proxy Server) is a kind of important security function, its working mainly in the open systems interconnection (OSI) model of the session layer, which have the effect of the firewall.Most of the proxy server is used to connect to the INTERNET (INTERNET) and INTRANET (LAN).
Proxy Server English full name is the Proxy Server, its function is to obtain the network information agency network users.Image of say: it is the transit network information.The proxy server is like a large Cache, so it can significantly improve the browsing speed and efficiency.What is more important: the Proxy Server (Proxy Server) is one of the Internet link level gateway provided important security function, its working mainly in the open systems interconnection (OSI) model of the session layer.Main features:
beyond its IP access restrictions, access to foreign sites.Education network, in the past 169 nets and other network users can access through agent abroad.
access unit or group internal resources, such as a university FTP (if the agent's address in the range of allowing access to the resources), use the education network address within the period of free proxy servers, can be used to open to the education of various kinds of FTP upload download, and all kinds of data query Shared services.
breakthrough China telecom IP blocking: China telecom users have a lot of website is limited access, this limitation is artificial, different Serve to address the blockade is different.So you can't access can try using a proxy server abroad.
improve access speed: usually a proxy server is set a bigger hard drive buffer, when information with the outside world through, at the same time also save it to the buffer, when other users to access the same information, are directly by the buffer to retrieve information, to the user, in order to improve the access speed.Hide the real IP
: users can also through this method to hide your IP, from attack.
for these reasons, most of the proxy server is used to connect to the INTERNET (INTERNET) and INTRANET (LAN).In China, the so-called China public multimedia information net and education network of large national LAN are independent, is cut off from the Internet.For a variety of needs, some group or individual opened between two network proxy server, if we know these proxy server address, you can use it to reach the foreign websites.
(1) the main functions of the proxy server Settings user authentication and billing functions, can be used to charge to an account according to the customer and no registered users have the right to through a proxy server to access the Internet network.And the user's access time, access to sites, and information flow.
(2) the user is hierarchical management, set up different user access permissions, for internal or external Internet address filtering, set different access permissions.
(3) increase the buffer (Cache), to improve the access speed, buffer creation for frequently accessed addresses, greatly improve the efficiency of hot site visit.Proxy server usually set a bigger hard drive buffer (could be as high as several GB or more), when the information with the outside world through, at the same time also save it to the buffer, when other users to access the same information, are directly by the buffer to retrieve information, to the user, in order to improve the access speed.
(4) connected to the Intranet and Internet, acting as a Firewall (Firewall) : because all the Intranet users through a proxy server to access the outside world, the only mapped to an IP address, so that the outside world does not have direct access to the Intranet;At the same time you can set the IP address filtering, limiting Intranet access to external.
(5) save IP overhead: the proxy server allows the use of a large number of false IP address, save resources online, use a proxy server can reduce the need for IP address, for the use of local area network (LAN) way to access the Internet, if it is within the local area network (LAN) of each user to apply for an IP address, one can imagine the cost.But after using a proxy server, just on the proxy server has a legitimate IP address, other users can be used inside a LAN 10. *. *. * the private IP address, so that we can save a lot of IP, reduce the maintenance cost of the network.