Based Vpn Remote Nms

Computer network is quit important to human's life and society developing. Its high-speed developing and using in many fields drives the information developing of the whole society. Especially Internet is changing and affecting everyone's life. In this thesis, we design and develop the Long-distant Network Control and Management System Based On Virtual Private Network. The system can control and mange the IE explorer in the computers under real-time control. Through this way, we can protect the computers and make the users browse the legal websites.The content of this thesis is as follow:1. Some modes of the communications in some different subnets were analyzed and compared in the thesis. The prototype of Network Control and Management System(NCMS) have been designed ,which based on IPSec protocol and Virtual Private Network's tube mode.2. The details design of NCMS were described carefully. And some important key points were discussed deeply.3. The gateway of Linux which based on IPSec have been designed and implemented.4. The security model of IPSec protocol .and date processing have been analyzed. And the design of guardianship mode is described in detail.5. Using the model of COM modules operating IE explorer, the most difficulty problems were solved.6. Through system execute in real world and some test on system security and reliability, the NCMS is validated correctly and effectively.