Instance analysis technical issues of access networks in Colleges and Universities

At present, the access network technology has been applied to major campuses, and many problems have emerged, such as illegal access. Here we mainly introduce the design of the broadband network service on the Guangxi campus, this section describes how the campus handles these problems.

I. Summary
The university broadband network is a private network that provides high-speed Internet access for college students' dormitories and campus networks by telecom operators. It is intended to provide high-speed broadband access network technology for 17 million of Chinese students, during the construction process, from leased line leasing at the earliest stage, to Telecom's direct management of the Broadband Access Network Technology operator in the Student Dormitory, to the current operating mode in which schools and operators jointly manage and operate. After years of exploration and operation, operators have clearly understood the development needs and economic benefits of broadband networks in colleges and universities, and are also faced with problems that must be solved by broadband networks in colleges and universities. This article is based on the planning and construction of broadband networks for Colleges and Universities in Guangxi, and discusses the common problems of campus networks, find feasible ideas for building a campus network that is more in line with China's national conditions while meeting future development needs.

Ii. Overview of Guangxi campus Broadband Network Business Requirements
1. distributed access and point-based collection
A college campus network is usually connected to CERNET and the Internet at the same time. The access server can support multiple egress and implement one-time authentication and separate control. Different access and billing policies for Internet and CERNET access can be set for student users.

2. centralized authentication, centralized billing, and centralized operation
Centralized construction of an operation center for a university can reduce investment, improve management level, improve user relationship management level, and increase response speed.

3. Anti-Illegal Access
At present, most colleges and universities use monthly subscriptions to carry out their broadband business, which follows the billing method of home users and takes into account the low payment ability of students, pricing is also generally lower than that of home users. However, in fact, the insufficient bandwidth billing technology is often used by college students to apply for broadband in their own names for the use of black Internet cafes and enterprises, or to share bandwidth with several users to share the cost, this has caused huge economic losses to telecom operators. The ratio of paying users in colleges and universities to illegally accessing users ranges from.

4. P2P Traffic limiting
Currently, P2P downloading traffic in the Internet is very high, including the well-known BT, eDonkey, and eMule, which are all popular P2P software. P2P services occupy a large amount of network bandwidth. Currently, 70% of the Internet traffic in colleges and universities is P2P business traffic, of which 50% is BT traffic. It can be seen that BT download and illegal access network technology constitute the biggest obstacle to broadband network operation in Colleges and Universities: Student users enjoy a lower monthly subscription price than home users, while using more network bandwidth and traffic, this will inevitably lead to an increase in the cost of university broadband network operations and a pause in user growth, and even affect the operation of the entire IP Man.

5. Information publishing platform
Campus Network users are different from home users and coexist with the campus intranet. In addition to operators, the school also provides management functions for students. Through an effective information publishing mechanism, users can be notified in a timely manner. For example: reminder information, school notifications, and virus information.

Iii. Technical Introduction
The broadband network of Colleges and Universities in Guangxi adopts the Dr. COM 2133 B-RAS access server provided by Beijing city hotspot Company and the dedicated billing operation platform of colleges and universities, and has targeted solution to the following technologies.
Anti-Illegal Access Network Technology
Illegal access, also known as private connection, has been recognized for a long period of development. It mostly uses bypass listening technology at the network outlet, including connection/traffic detection, mac address detection, SNMP scan, TTL detection, clock offset detection, and feature detection. There are many methods for reference, but only the ability to analyze illegal network access conditions can be achieved, there are several obvious problems that need to be solved before practical application:

First, the analysis and summary of long-period statistics are required. It takes one week or one month to generate real-time judgments and report false positives;
2. You can only list several illegal access users under one account. You cannot determine whether the user is a real legal user or illegal access user;
Third, only account blocking or some interference can only be performed on TCP connections, but UDP is not valid), real-time control is not allowed, and only legal user access is not allowed, unauthorized access users cannot access the service.
Fourth, if the evidence is provided after the individual data record, it will easily lead to user dissatisfaction, resulting in a large number of complaints. If the complaint is confirmed directly at the user's site, the difficulty will be even greater, and the loss will not be worth the candle, resulting in difficult promotion operations.

Iv. Summary
After more than a year of exploration and practice, the practical problems of Broadband Network Access Technology in some colleges and universities have been solved. The Guangxi telecom investment and operation University Campus Network has achieved good benefits in the experimental bureaus in Nanning and Guilin, students have a high degree of satisfaction with accessing the Internet. This year, they will be promoted to dozens of Colleges and Universities in more than 10 cities in the region, which will produce greater economic benefits.

1. Comprehensive Analysis of Access Network Technology
2. Wireless Access networks must also adhere to Sustainable Development
3. Future development direction of Optical Fiber Access Network
4. Comprehensive comparison of Broadband Access Technology
5. Detailed description of various Access Network Solutions