Analysis using a proxy server on the Internet to achieve the management of teaching and training

Paper Keywords: proxy server, firewall, Internet, China Education and Research Network, Campus Network Management
Abstract: Teachers and students about the Internet is essential knowledge for teaching and training, an increase in the campus network through a proxy server can be on the teaching, training, implementation of effective management of the network environment.


Into the eighties, the world has been built almost all the developed countries have Education and Research computer network, which generated global computer information network, speed up information transmission speed, for the majority of teachers, students and Researchers to provide a new computing environment, a fundamental change and to promote the exchange of information between them, sharing of resources, scientific and Research cooperation as an important Education and Research infrastructure. Liaoning University, China Education and Research Network has become a member at the same time as a member of the Internet and have their own WWV}. FTP.I} BS Internet and other Internet resources, training and teaching in schools is different from the family room, Internet cafes and network management center. has its own characteristics:
(1} Because it is training students and teachers to enable them}} f * initial grasp of the basics of browsing the web, limit the scope of the visit Liao large or within the Education network, which can prevent blindness and bad web surfing sites access to both save the limited funding for schools, but also solve online safety issues.

(2) must be solved 4U designated sites around the same time the speed of access to bottleneck
(3) Teachers can specify a higher authority, so that they can use a variety of protocols, access to a variety of resources; for students to specify the lower right.

(4) To prevent the host from outside the destruction of resources, need to set up a "firewall"
(5) The IP address of the school is limited, not for each machine is assigned a real IP address,
Proxy Server (Panty Server) will be the introduction of network training can solve many problems on the room management.

1, the characteristics of the proxy server
(1) proxy server to support all of the Interne: protocols, including HTTP. FTP. TCPI IP, e-mail protocol, which will ensure that you can use the browser to access to all Internet resources.

(2) proxy server to provide better security mechanisms, including "firewalls" properties, such as: packet filtering, event alerts and logs. This mechanism makes the room managers can 1P address or domain to filter Internet sites.

If you do not guard the campus network to connected to the Internet, suddenly vulnerable to intruders good, resulting in the loss of dedicated resources, and even subjected to violations of the network paralysis virus. Firewalls} Firew} ll) technology is used on the Internet as a security measures, it can be predetermined by the user program control information. inflow and outflow of information, supervision and control of the user's operation. using this technology, private network system can be controlled according to their own Internet applications and access network related Internet sites.

If you use a proxy server, but the proxy server is connected directly with the Internet, and Internet clients do not directly and Interne: connected (but not directly connected), the client's internal resources will not be violated, it can also play a firewall proxy server role.

(3) provides a powerful proxy server caching, a cache can be distributed to the array or chain of multi-agent control in the eyes of business, therefore, can not only save costs but also can improve access speed simultaneous access to the bottleneck problem. Its routing can also provide automatic flow balancing and fault tolerance, will help improve the performance and stability.

(4} because the IP address is limited, so that each application for a client IP address is not realistic if the use of a proxy server (using proxy server software Proxy management), only the proxy server to a real IP address, and the internal Intranet Other clients assigned by the Proxy address to a virtual client, which saves the IP address, make sure that all clients can be indirectly connected with the Internet and share Internet resources.

2 System hardware and software configurations required
Hardware system, including: servers, clients, hubs, network cards, routers. Reposted elsewhere in the Research Papers Download http://www.hi138.com software system, including: Web server software Windows' _VT $ erver4 .. Chinese; customers Chinese version of machine software Windows9 5; proxy server software Microsoft Proxy Server2-D; network management software Transcend Workgroup Manager For Windows.


3 Implementation of Proxy Server System
According to the school situation and needs, system topology shown in Figure 1

Proxy server system to achieve these steps:
(1) hardware settings in the proxy server, you should use two cards, a card which is connected with the Internet, the address is real IP address, Internet and Intranet by it to achieve the interconnection; another piece of card is the realization and Intranet Internal each client connection, which would give each client a virtual IP address assigned to realize the indirect client and Internet connected, and thus shared Internet resources.

(2) IP address assigned each client a virtual IP address through the implementation and the Interne: indirectly linked. So that the virtual network adapter address is the IP address, it's true with the proxy server IP address is different, but by the proxy server According to the number of Internet clients within a given virtual IP address of a range to be allocated to each according to a client a virtual IP address so the client can be realized indirectly connected with the Internet.

(3) server-side and client side software setup
�� server settings: a. the proxy server parameters in the installation of Windows NT Windows NT operating system, we should first be connected to the Internet network card directly to a real IP address settings, for example, can be set to 111.111.11.1, then set the subnet mask (such as 255_255.255.0 and gateway. Finally, given the virtual Intranet connected to the LAN IP address settings, for example, can be set to 20_20_20_1, gateway not set, b. Select the location parameters of the proxy server ' 'IP-to select the server. "Intranet settings such as virtual address range: 2U.20.20.1-20.2U.2U.25} ...''domain into User Manager", the establishment of a global group of stud, and then create a number of User studl students to stud2U, these users to stud group. d. into Microsoft Proxy Server for Internet Server Manager option, set the "sceurity" the '`Domain Filter" to "edu.cn", that is, only students They range in CERIVET browse information. e, into the Microsoft Proxy Server for Internet Server Manager option, set the "Winsock Proxy" in the "Permission" to "stud", set "Web Proxy" in the "Permission" to "stud".

�� Set the client-side client wants to achieve with the Internet connection is through Proxy Client: software implementation. Each client after installing W indows95 by Proxy Client; software can be realized on the management of the client, the setup procedure as follows: a 'client should be installed W indows9 $ or Windows NT Workstation operating system. In the "Network" to add TCPI IP protocol. b. through the "My Network Places" by the server, Proxy Server Proxy Client installed on the client software, client 1 LAN IP address can be set to: 20. 20. 2U. 2, Subnet Mask: 255.255.255.4, Gateway: 24.24.20.1 (and Proxy Server 2 IP address of the same card). reposted elsewhere in the Research Papers Download http : / / www.hi138.com