1. SELinux and Firewall Optimization 1. SELinux SELinux, or Security-Enhanced Linux, is a Linux kernel module and a security subsystem for Linux, primarily developed by the National Security Agency (NSA). Its main purpose is to minimize the resources accessible to service processes in the system (principle of least privilege). Due to this principle, many operations … Read more
Click the blue text above to follow me! OverviewTechnically speaking, iptables is not a firewall; the real firewall is netfilter, which runs in the system kernel. iptables is merely a representative of netfilter, primarily functioning to interact with users, obtaining their requests and converting them into information that netfilter can accept.iptables mainly operates at the … Read more
Through action, knowledge deepens; through deep knowledge, action becomes more effective. To stimulate students’ interest and enthusiasm for studying information technology, and to help everyone understand more practical computer knowledge, the School of Information Technology has specially launched the “IT Knowledge Base” column. Continuous effort, like water dripping through stone, conveys the pulse of information, … Read more
By default, if you use a router with an OpenWrt-like system to dial into an optical modem in bridge mode, you will not be able to access the modem’s management page, which can be quite inconvenient. There are many ways to fix this, and here we document a method that only requires a web browser. … Read more
Start of the Main Content Every encounter is a fate, follow ⭐ to not miss out – sharing practical tutorials and tips every day. 1. Network Interface Management: The Foundation of Network Connectivity 1.1 Analysis of Modern Network Toolchains In contemporary Linux systems, the <span>iproute2</span> suite has completely replaced the traditional <span>net-tools</span>, with advantages including: … Read more
By default, OpenWRT does not allow IPv6 outbound traffic. This article will guide you through configuring the firewall to permit IPv6 outbound traffic. Testing First, ensure that your ISP is not blocking your IPv6 traffic. The testing method is quite simple; generally, OpenWRT does not block ICMP traffic. You can obtain your local IPv6 address … Read more
Some friends have commented on how to distribute and network community switches?This topic has also been discussed in our weak current VIP technical group.In this issue, let’s understand about how to network community networks? Distribution of switches? Analysis of the community switch networking structure 1. The access layer switches use a hundred megabit to the … Read more
Abstract: This article explains how to log incoming and outgoing dropped firewall packets. When your IPTables rules are not working as expected, you may need to log the dropped packets for troubleshooting. This article describes how to log incoming and outgoing dropped firewall packets. Logging All Dropped Incoming Packets First, we need to understand how … Read more
In the battlefield of network security, firewalls act as vigilant sentinels, weaving rules with code to protect the borders of the digital world. When you hold a Linux system in your hands, this operating system, inherently equipped with “security genes,” has already prepared various firewall tools for you. Let us break down the core value … Read more
Editor Recommended This issue’s topic – What was your initial motivation for learning programming? Computer Networking – Juniper Firewall Basic Introduction Course and PDF Click here“Read the original text” to exchange for the download link