Linux Routing Fundamentals: A Deep Dive into the Kernel's Networking Stack
2025-01-08
This article delves into the intricacies of Linux kernel routing. Linux systems utilize multiple routing tables (local, main, default), consulted sequentially to find matching routes. Key concepts like longest prefix matching, source address selection, and ICMP error handling are explained. The article demonstrates using the iproute2 tool and handling link failures. This detailed exploration of routing tables, rules, and the lookup process provides a solid foundation for understanding advanced Linux routing techniques like policy-based routing, VRFs, and network namespaces.
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Networking