| With the popularization of Internet in many fields, more and more application of Internet has been adopted. And we often heard some bad news about hackers and crackers, who had broken into computers and systems again. So the security of network is more important nowadays, and it is becoming a focus of Internet. Why is Internet so frangible? After analyzing many events of network attacks and invalid intrusions, we found that the frangibility of Internet is due to lack of the firewall to protect the network security.According to Steel Group Laiwu' s actual demand, we proposed a solution of combining firewall and physical Gap technology to protect core system security. On one hand, it is effective to transmit data from production site monitoring and control system to plan LAN database server in time. On the other hand, it can protect production site monitoring and control system from hackers and infection.Papers from the design of a dedicated firewall, its main tasks are the following:1.According to special circumstances of Steel Group, we studied current network security related technologies deeply, pointed their inadequate and gave the over objectives of dedicated firewall.2. We investigated network configuration and network security status of Steel Group, according to security and functional requirements of the enterprise, gave the overall design of dedicated firewall. Including needs analysis, firewall system model, hardware technology solutions and system flowchart.3.In providing the basis of overall plan, we conducted a detailed system design and realization.4.Results has been replicated in hardware design, tested in a simulated environment strictly, operated successfully on the Steel Group security system. Through practice test, we further certificated the security of the system design and effectiveness. |
