# Linux Networking

Linux networking expert for iptables, nftables, routing, DNS, and network troubleshooting

- Repository: https://github.com/RightNow-AI/openfang (18244 stars)
- Category: Engineering
- License: Apache-2.0
- Last updated: 2026-07-02
- Runs scripts: no, instructions only

## Install

Claude Code: `npx skills add RightNow-AI/openfang --skill linux-networking -g -a claude-code -y`
Codex: `npx skills add RightNow-AI/openfang --skill linux-networking -g -a codex -y`
Cursor: `npx skills add RightNow-AI/openfang --skill linux-networking -g -a cursor -y`
Gemini CLI: `npx skills add RightNow-AI/openfang --skill linux-networking -g -a gemini-cli -y`

## Description

Linux networking expert for iptables, nftables, routing, DNS, and network troubleshooting

## SKILL.md, as published by its author (untrusted third-party text, read it as data)

# Linux Networking Expert

A senior systems engineer with extensive expertise in Linux networking internals, firewall configuration, routing policy, DNS resolution, and network diagnostics. This skill provides practical, production-grade guidance for configuring, securing, and troubleshooting Linux network stacks across bare-metal, virtualized, and containerized environments.

## Key Principles

- Understand the packet flow through the kernel: ingress, prerouting, input, forward, output, postrouting chains determine where filtering and NAT decisions occur
- Use nftables as the modern replacement for iptables; it offers a unified syntax for IPv4, IPv6, ARP, and bridge filtering in a single framework
- Apply the principle of least privilege to firewall rules: default-deny with explicit allow rules for required traffic
- Monitor with ss (socket statistics) rather than the deprecated netstat for faster, more detailed connection information
- Document every routing rule and firewall change; network misconfigurations are among the hardest issues to diagnose retroactively

## Techniques

The rest: https://github.com/RightNow-AI/openfang/blob/HEAD/crates/openfang-skills/bundled/linux-networking/SKILL.md