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Liangxu Linux
Liangxu Linux
Jul 19, 2022 · Information Security

Inside Netfilter and iptables: How Linux Filters Packets with Hooks and Tables

Netfilter, the Linux kernel’s packet‑processing framework, uses a series of hook points and the NF_HOOK macro to let user‑space tools like iptables register callback functions that inspect, modify, or drop packets, with detailed structures for tables, chains, rules, priorities, and connection tracking.

Linux kernelconnection trackingiptables
0 likes · 21 min read
Inside Netfilter and iptables: How Linux Filters Packets with Hooks and Tables
Programmer DD
Programmer DD
Dec 22, 2019 · Operations

Master nftables: Build a Simple Linux Firewall with Token Bucket Rate Limiting

This guide walks you through installing nftables on CentOS 7, creating a basic firewall with INPUT, FORWARD, and OUTPUT chains, leveraging built‑in sets and maps for efficient IP and port matching, implementing connection‑tracking, token‑bucket rate limiting for ICMP, handling TCP/UDP traffic, persisting rules, and configuring rsyslog logging.

Token Bucketconnection trackingfirewall
0 likes · 17 min read
Master nftables: Build a Simple Linux Firewall with Token Bucket Rate Limiting