The main functions of a proxy server

(1) to set user authentication and billing functions, the user can account for unregistered users the right to Internet access through a proxy server network. And the user's visit, the place to visit, the flow of information to compile the statistics.
(2) user management at different levels, different set of users access to internal or external Internet address filtering, a different set of access rights.
(3) increase in the buffer (Cache), to increase the speed of access, often visit the address to create a buffer zone to greatly improve the efficiency of the popular sites to visit. The proxy server settings are usually a larger hard disk buffer (possibly up to several GB or greater), when the outside world through information, but also to preserve its buffer zone, and then when other users access the same information , Directly in the buffer zone out information to users in order to improve access speed.
(4) Internet connection with the Internet, to act as a firewall (Firewall): since all internal network users to visit the outside world through a proxy server, only one IP address for the map, so outsiders can not directly access the internal network; at the same time can be set up IP address filtering, Restrictions on the internal network to external access.
(5) cost-saving IP: the proxy server to allow the use of a large number of IP address pseudo-saving on-line resources, that is, to use a proxy server to the IP address can reduce the demand for the use of local area network access methods Internet, as if the local area network (LAN) for each A user to apply for an IP address, the cost can be imagined. However, the use of proxy servers, proxy servers can have a legitimate IP address, LAN users can use the other 10 .*.*.* such a private IP address, this can save a lot of IP, to reduce network maintenance costs.
What is HTTP proxy: www for each of the Internet are the familiar, www is used to connect the http request, so we browse the Web, download data (ftp may also have an agreement) that is used http proxy. It is usually bound in a proxy server, and other ports on the 80,3128,8080.
What is a socks proxy: the use of socks agreement is SOCKS proxy server, is a common proxy server. Socks is the bottom of the circuit-level gateway, is DavidKoblas in 1990 developed since then has been on the Internet RFC standards as open standards. Socks are not required to follow specific application of the operating system platform, Socks proxy and application-level proxy, HTTP layer of different agents, Socks proxy simply pass packets without having to be concerned about what kind of application protocol (such as FTP, HTTP and NNTP request) . So, Socks proxy other than the application layer proxy much faster. It is usually binding on the proxy server on port 1080. If you are an enterprise campus network or the Internet, through a firewall or through a proxy server on the Internet access may need to use SOCKS. Under normal circumstances, for dial-up users do not need to use it. Note that the website often used a proxy server is usually devoted to the http proxy, SOCKS, and it is different. As a result, you can visit the website does not mean you can SOCKS visit Internet. Popular firewall or proxy software support SOCKS, but the administrator to open the function. If you are not sure whether you need to SOCKS or whether SOCKS available, contact your network administrator. In order to use the socks, you need to know:
① SOCKS server's IP address
② SOCKS port's services
③ SOCKS the need for user authentication services? If you would like your network administrator to apply for a password and user
Know that the above information, you can fill in this information, "the network configuration", or fill in registration for the first time, you can use a proxy socks.
In practice, can be used as a SOCKS proxy: e-mail and newsgroup software, paging network ICQ, and MIRC chat network uses a proxy server to play the game Lianzhong, and so on a variety of applications among the game.