Networking Skill

Name: Networking Skill
Author: pluginagentmarketplace

pluginagentmarketplace/custom-plugin-devops

13 installs
3 repo stars
Updated January 5, 2026
pluginagentmarketplace/custom-plugin-devops

Helps with ai & agent building tasks.

About

networking-skill is a Claude Code skill for ai & agent building. It helps solo builders move faster with AI-assisted development.

networking-skill
AI & Agent Building
AI-coding skill

Networking Skill by the numbers

13 all-time installs (skills.sh)
Ranked #11,389 of 16,546 AI & Agent Building skills by installs in the Skillselion catalog
Data as of Aug 4, 2026 (Skillselion catalog sync)

npx skills add https://github.com/pluginagentmarketplace/custom-plugin-devops --skill networking-skill

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Installs	13
repo stars	★ 3
Last updated	January 5, 2026
Repository	pluginagentmarketplace/custom-plugin-devops ↗

What it does

Helps with ai & agent building tasks.

Files

SKILL.mdMarkdownGitHub ↗

Networking Skill

Overview

Master networking fundamentals for DevOps infrastructure management.

Parameters

Name	Type	Required	Default	Description
protocol	string	No	all	Protocol focus
operation	string	Yes	-	Operation type

Core Topics

MANDATORY

TCP/IP and OSI model
DNS configuration and troubleshooting
HTTP/HTTPS and TLS
SSH key management and tunneling
Firewall basics (iptables, ufw)

OPTIONAL

Load balancing
VPN and tunneling
Traffic analysis with tcpdump

ADVANCED

BGP and routing protocols
SDN concepts
Zero-trust networking

Quick Reference

# DNS
dig +trace example.com
dig @8.8.8.8 example.com
host -t MX example.com

# TCP/IP Diagnostics
ping -c 4 host
traceroute host
ss -tuln
ip addr show

# HTTP Testing
curl -I https://example.com
curl -v https://example.com

# SSL/TLS
openssl s_client -connect host:443
openssl x509 -in cert.pem -text -noout

# SSH
ssh-keygen -t ed25519
ssh-copy-id user@host
ssh -L 8080:localhost:80 user@host
ssh -D 1080 user@host

# Firewall (UFW)
ufw status verbose
ufw allow 22/tcp
ufw deny from 192.168.1.100

# Firewall (iptables)
iptables -L -n -v
iptables -A INPUT -p tcp --dport 22 -j ACCEPT

Troubleshooting

Common Failures

Symptom	Root Cause	Solution
Connection refused	Service not running	Check ss -tuln
Connection timeout	Firewall/routing	Check firewall, traceroute
Name resolution failed	DNS issue	Check /etc/resolv.conf
Certificate error	Expired/invalid cert	Check dates, verify chain

Debug Checklist

1. Layer 1-2: Link up? ip link show 2. Layer 3: Ping gateway? 3. Layer 4: Port open? ss -tuln 4. DNS: Resolving? dig hostname 5. Firewall: Allowing? iptables -L

Recovery Procedures

Lost SSH Access

1. Use cloud console/IPMI 2. Check sshd: sshd -t 3. Verify firewall: iptables -L -n

Resources

# SSH Config Template for DevOps
Host *
    ServerAliveInterval 60
    ServerAliveCountMax 3
    AddKeysToAgent yes

Host dev-server
    HostName dev.example.com
    User devops
    IdentityFile ~/.ssh/dev_key
    Port 22

Host prod-*
    User admin
    IdentityFile ~/.ssh/prod_key
    StrictHostKeyChecking yes

#!/usr/bin/env python3
import json, socket
def check(host="8.8.8.8", port=53): 
    try: s = socket.socket(); s.settimeout(3); s.connect((host, port)); s.close(); return {"internet": True}
    except: return {"internet": False}
if __name__ == "__main__": print(json.dumps(check(), indent=2))

#!/bin/bash
# Simple port scanner
HOST=${1:-localhost}
echo "Scanning $HOST..."
for port in 22 80 443 3306 5432 6379 8080 9090; do
    (echo >/dev/tcp/$HOST/$port) 2>/dev/null && echo "Port $port: OPEN"
done