Common Linux Commands – Part 5 5. iptables Firewall: Four Tables and Five Chains: The default four rule tables: raw table: Determines whether to track the state of the packet, includes rule chains OUTPUT, PREROUTING mangle table: Modifies packet content, used for traffic shaping, sets packet marks, includes rule chains INPUT, OUTPUT, FORWARD, PREROUTING, POSTROUTING … Read more
Common Linux Commands – Part 6 6. Application Commands: -t filter: Indicates adding rules at the end of the chain (if no table name is specified, the default is the filter table) -I INPUT: Indicates adding an inbound rule at the first line of the filter table (-I INPUT 2 indicates adding an inbound rule … Read more
Introduction Buildroot is an open-source tool for building embedded Linux systems, with its package management principles centered around “automated builds” and “dependency management.” It achieves full process control from source acquisition to target system generation through modular design. Core Architecture of Buildroot Package Management Buildroot adopts a layered architecture and modular design, mainly consisting of … Read more
In the field of server management, iptables and nginx forwarding are two very important concepts that have both similarities and significant differences in functionality and application scenarios. Today, we will delve into the differences between iptables and nginx forwarding and the respective application scenarios for each. 1. iptables Forwarding 1. Working Principle iptables is a … Read more
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