Click the blue “Most Programmer” to follow me! Add a “Star“, every day at 18:03 to learn technology together! In-Depth Analysis of Linux Network Packet Loss 1. Background: From the image, you can see the potential locations where packet loss may occur, which actually spans the entire network protocol stack. In other words, there is … Read more
Network security is the cornerstone of operations and maintenance, and mastering iptables and firewalld is an essential skill for every Linux administrator. This article will take you deep into the core principles and practical techniques of these two major firewall tools! 1. Introduction to iptables iptables is a command-line tool for managing firewall rules in … Read more
链接： https://blog.csdn.net/qq_39578545/article/details/130246445? ☞ The excellent course has completely exploded! ☜ In-Depth Analysis of Linux Network Packet Loss 1. Background: From the image, you can see the potential locations where packet loss may occur, which actually spans the entire network protocol stack. In other words, there is a possibility of packet loss at every stage. • … Read more
Hello everyone, I am the Intelligence Guy~ In embedded Linux development, network issues are often “invisible killers”—sudden disconnections, inaccessible services, data packet loss… These may involve multiple aspects such as hardware, drivers, protocol stacks, and firewalls. Today, I will share how to troubleshoot network issues in embedded Linux, guiding you through the ultimate troubleshooting process … Read more
Follow our official account for discussions on Buildroot-related technical issues on the RK3568 platform.。 Porting OpenWRT RootFS on RK3568 Buildroot: Basic Network Function Verification Case This article mainly discusses compatibility issues encountered when using Buildroot kernel + OpenWRT rootfs, focusing on network functionalities such as VLAN, bridging, NAT, etc., and introduces how to perform basic … 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
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
Linux Network Namespaces 1. What are Linux Network Namespaces? A Network Namespace is a virtualization technology provided by Linux that allows the creation of multiple independent network environments, each with its own network interfaces, routing tables, iptables rules, etc. This is similar to network isolation in virtual machines or containers, but is more lightweight. Features … 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
“Last night, I dreamt of falling flowers by a quiet pond, how pitiful that spring is halfway gone and I haven’t returned home“ Linux kernel Traffic Control (TC) refers to the queuing and scheduling mechanism for receiving and sending data packets by network devices. It can implement basic functions such as Shaping, Scheduling, Policing ingress, … Read more