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networking-skill

@pluginagentmarketplace/custom-plugin-devops
2
0

Network protocols and troubleshooting - TCP/IP, DNS, HTTP/HTTPS, SSH, firewalls.

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1Download skill
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3Upload to Claude

Click "Upload skill" and select the downloaded ZIP file

Note: Please verify skill by going through its instructions before using it.

SKILL.md

name networking-skill
description Network protocols and troubleshooting - TCP/IP, DNS, HTTP/HTTPS, SSH, firewalls.
sasmp_version 1.3.0
bonded_agent 02-networking-protocols
bond_type PRIMARY_BOND
parameters [object Object], [object Object]
retry_config [object Object]
observability [object Object]

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