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linux-networking

Diagnose and fix Linux networking issues with firewall, routing, and DNS guidance.

10|7|Updated Mar 14, 2026
Search Tags:#troubleshooting#networking#linux#firewall#dns#iptables#nftables
One-click install
npx skills add https://github.com/librefang/librefang-registry --skill linux-networking-librefang
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: linux-networking
Source: https://github.com/librefang/librefang-registry/tree/main/skills/linux-networking
Command: npx skills add https://github.com/librefang/librefang-registry --skill linux-networking-librefang

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Linux networking issues span firewalls, routing, DNS, and diagnostics across physical, virtual, and container environments. This guide helps engineers design secure network paths, troubleshoot connectivity, and optimize performance.

Core Features & Use Cases

  • Firewall and NAT guidance: configure iptables/nftables rulesets and ensure correct NAT behavior.
  • Routing and policy routing: set up source-based routing and multi-path routes for complex topologies.
  • DNS resolution and troubleshooting: diagnose DNS resolution issues and manage resolvers across environments.
  • Diagnostics & observability: use tools like ss, tcpdump, dig, and resolvectl to diagnose network problems.

Quick Start

Describe your current Linux networking setup and I will generate a basic firewall, routing, and DNS troubleshooting plan.

Frequently Asked Questions about linux-networking

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I troubleshoot Linux networking connectivity issues?▼

Troubleshoot Linux networking connectivity by running diagnostic workflows with tools like ss, dig, tcpdump, and resolvectl to isolate firewall, routing, or DNS resolution problems.

What's the best way to configure a Linux firewall using nftables or iptables?▼

Configure a Linux firewall by applying best-practice rulesets using nftables or iptables, ensuring correct network address translation behavior and secure traffic filtering.

How does policy-based routing work for complex Linux network topologies?▼

Policy-based routing works by setting up source-based routing and multi-path routes, allowing Linux to direct traffic through specific interfaces based on policies rather than just destination.

Can I use this to diagnose DNS resolution problems in containers and virtual machines?▼

Yes, you can diagnose DNS resolution problems across bare-metal, virtual machines, and containerized environments by managing resolvers and using tools like dig to test query paths.

Why is my Linux firewall blocking traffic after migrating iptables rules to nftables?▼

Linux firewall traffic blocking during iptables to nftables migration occurs due to syntax mismatches or missing NAT chain translations, requiring diagnostic workflows to verify rule equivalents.

Do I need source-based routing to manage multiple network paths on a Linux server?▼

You need source-based routing on a Linux server when complex topologies require multi-path routes, ensuring return traffic correctly exits through the same interface it entered.

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