How to implement a smart campus project? The main challenge lies in the networking. In this issue, we will understand campus networking through three diagrams. Three diagrams, detailing campus network networking 1. Main components of the campus network frameworkThe campus network mainly consists of several parts: data center, wired network, wireless network, IoT, smart classrooms, … Read more
iptables is a classic firewall tool developed for the Linux system based on the netfilter kernel framework, focusing on IPv4 packet filtering and NAT rule configuration. As a built-in component of the Linux kernel, it features efficiency and flexibility, supporting core capabilities such as state detection and fine-grained traffic control. It is the most commonly … Read more
Hello everyone, I am Deng Ju~ iptables is a powerful firewall tool in the Linux system, used to manage firewall rules and network traffic. It allows administrators to configure rules to filter, transform, or forward packets, making it a core component of Linux network and security configuration. With iptables, users can set security policies to … Read more
System aarch64 1$ uname -a 2Linux yhy-87 5.10.0-153.12.0.92.oe2203sp2.aarch64 #1 SMP Wed Jun 28 23:18:48 CST 2023 aarch64 aarch64 aarch64 GNU/Linux 3$ cat /etc/os-release 4NAME="openEuler" 5VERSION="22.03 (LTS-SP2)" 6ID="openEuler" 7VERSION_ID="22.03" 8PRETTY_NAME="openEuler 22.03 (LTS-SP2)" 9ANSI_COLOR="0;31" x86_64 1$ uname -a 2Linux yhy-106 5.10.0-182.0.0.95.oe2203sp3.x86_64 #1 SMP Sat Dec 30 13:10:36 CST 2023 x86_64 x86_64 x86_64 GNU/Linux 3$ cat /etc/os-release 4NAME="openEuler" … Read more
1. What is UFW <span>ufw</span> (Uncomplicated Firewall) is a simplified firewall management tool provided in Ubuntu and some Linux distributions. It is based on <span>iptables</span> / <span>nftables</span>, but wraps a simple and easy-to-use command line interface to help users quickly configure firewall rules (such as opening ports, denying access, limiting access, etc.) without directly manipulating … Read more
Security Hardening of Linux Systems Linux is a free and open-source Unix-like operating system. As an open-source operating system, Linux servers are widely used due to their significant advantages in security, efficiency, and stability. However, if permissions are not properly allocated, the security of the Linux system cannot be adequately guaranteed. Below, we will primarily … Read more
The door is open, but you can’t get in? Your website may be facing HTTPS blockage! Hello everyone, I am the technical steward of the Di Ping Wang style! Recently, many friends have reported: “Why can my website open with HTTP, but it fails with HTTPS?” Don’t panic! Today, I will guide you to the … Read more
Most SEs engaged in the networking industry now have various VPSs, which can be used to set up an Ocserv service on a minimal VPS for normal access to Google, OpenAI, etc. Ocserv is an open-source SSLVPN server that provides a secure way for remote access, allowing users to securely connect to private networks or … Read more
The Role of iptables and the Difference from firewalld 1. What is iptables? What is it used for? iptables is a classic firewall tool on Linux systems, operating at the network layer, with main functions including: Packet Filtering Allowing or blocking specific network traffic based on rules (such as IP addresses, ports, protocols, etc.) Traffic … Read more
Click the blue “Best Programmer” to follow me! Add a “Star“, every day at 18:03 to learn technology together! Complete Guide to Configuring iptables and firewalld Firewalls 1. Basic Concepts of Firewalls 1.1 What is a Firewall A firewall is a network security device that monitors and controls incoming and outgoing network traffic based on … Read more