Data Security Defense System based on Computer Network Technology

With the rapid development of the Internet, network security threats are also increasing, so establishing an effective data security defense system has become crucial. The system designed in this paper is based on Netfilter/Iptables technology, which is a powerful tool for packet filtering, forwarding and network address translation in Linux operating system. By using Netfilter/Iptables, the research can flexibly control and manage the data packets entering and leaving the network, so as to achieve the purpose of data security defense. Specifically, the system designed in this paper will make use of Netfilter/Iptables for the following aspects of data security defense: First, the system will set inbound and outbound filtering rules to prevent unauthorized access and insecure network connections. Second, the system will implement network address translation (NAT) functions to hide the real IP address of the internal network and provide an additional layer of protection. In addition, port forwarding rules will be set to ensure that only authenticated users can access specific network services. To enhance the security of the system, this paper will also introduce other data security technologies such as intrusion detection systems (IDS) and intrusion prevention systems (IPS). IDS will be responsible for monitoring network traffic and identifying potential intrusions, while IPS will proactively intercept and block malicious traffic based on IDS alerts. Finally, the study will evaluate the performance and effect of the designed system through experiments. Using Netfilter/Iptables framework, a data security defense system is designed and tested to ensure the security and stability of the system.Various attack scenarios are simulated and evaluated with appropriate performance indicators to verify the feasibility and effectiveness of the system. To sum up, the Netfilter/Iptables based data security defense system designed in this paper is expected to provide a powerful and reliable solution to deal with the growing network security threats.