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SKILL.md
npx skills add 89jobrien/steve --skill network-engineering
Network architecture, troubleshooting, and infrastructure patterns. Use
npx skills add 89jobrien/steve --skill network-engineering
Comprehensive network engineering skill covering network design, troubleshooting, load balancing, DNS, and network security.
| Layer | Name | Protocols | Troubleshooting |
|---|---|---|---|
| 7 | Application | HTTP, DNS, SMTP | curl, browser tools |
| 6 | Presentation | SSL/TLS | openssl |
| 5 | Session | NetBIOS | - |
| 4 | Transport | TCP, UDP | netstat, ss |
| 3 | Network | IP, ICMP | ping, traceroute |
| 2 | Data Link | Ethernet | arp |
| 1 | Physical | - | cable tester |
Subnet Strategy:
Traffic Flow:
| Type | Layer | Use Case |
|---|---|---|
| Application (ALB) | 7 | HTTP/HTTPS, path routing |
| Network (NLB) | 4 | TCP/UDP, static IP, high performance |
| Classic | 4/7 | Legacy |
| Gateway | 3 | Third-party appliances |
| Type | Purpose | Example |
|---|---|---|
| A | IPv4 address | example.com → 192.0.2.1 |
| AAAA | IPv6 address | example.com → 2001:db8::1 |
| CNAME | Alias | www → example.com |
| MX | Mail server | example.com → mail.example.com |
| TXT | Arbitrary text | SPF, DKIM, verification |
| NS | Name server | DNS delegation |
| SRV | Service location | _sip._tcp.example.com |
| CAA | Certificate authority | Restrict CA issuance |
| Record Type | Recommended TTL |
|---|---|
| Static content | 86400 (1 day) |
| Dynamic content | 300 (5 min) |
| Failover records | 60 (1 min) |
| Pre-migration | Lower to 60 |
| Type | Validation | Use Case |
|---|---|---|
| DV | Domain ownership | Basic sites |
| OV | Organization verified | Business sites |
| EV | Extended validation | High-trust sites |
| Wildcard | *.domain.com | Multiple subdomains |
| SAN | Multi-domain | Multiple specific domains |
Recommended Settings:
references/troubleshooting.md - Detailed troubleshooting workflows# ALB Health Check
health_check:
path: /health
protocol: HTTP
port: 8080
interval: 30
timeout: 5
healthy_threshold: 2
unhealthy_threshold: 3
matcher: "200-299"# Query specific record type
dig example.com A
dig example.com MX
dig example.com TXT
# Query specific DNS server
dig @8.8.8.8 example.com
# Trace DNS resolution
dig +trace example.com
# Check propagation
dig +short example.com @{dns-server}# Check certificate
openssl s_client -connect example.com:443 -servername example.com
# Check certificate chain
openssl s_client -connect example.com:443 -showcerts
# Check expiration
echo | openssl s_client -connect example.com:443 2>/dev/null | openssl x509 -noout -dates
# Test TLS versions
openssl s_client -connect example.com:443 -tls1_2
openssl s_client -connect example.com:443 -tls1_3# Check if port is listening
netstat -tlnp | grep :80
ss -tlnp | grep :80
# Test TCP connectivity
nc -zv hostname 443
telnet hostname 443
# Check routes
ip route
traceroute hostname
mtr hostname
# DNS resolution
nslookup hostname
dig hostname
host hostname
# Network interfaces
ip addr
ifconfig
# Active connections
netstat -an
ss -tuln# Bandwidth test
iperf3 -c server-ip
# Latency analysis
ping -c 100 hostname | tail -1
# MTU issues
ping -M do -s 1472 hostname
# Packet capture
tcpdump -i eth0 port 443