Network Engineering Patterns

Network troubleshooting and configuration patterns from production work. Every entry has a date, a problem, and a proven solution.

Pages

Pattern	Focus
tcpdump	Packet captures for RADIUS, EAP, DNS, and general traffic analysis
DNS & dig	DNS troubleshooting, BIND zone debugging, AD DNS integration
Wireless & EAP	nmcli EAP-TLS configuration, iPSK bootstrapping, wpa_supplicant
Firewall	VyOS rules, pfSense migration, ISE SGT/ACL patterns
VLAN Troubleshooting	VLAN assignment verification, cross-VLAN access, subinterface debugging

Pattern

Focus

Packet captures for RADIUS, EAP, DNS, and general traffic analysis

DNS troubleshooting, BIND zone debugging, AD DNS integration

nmcli EAP-TLS configuration, iPSK bootstrapping, wpa_supplicant

VyOS rules, pfSense migration, ISE SGT/ACL patterns

VLAN assignment verification, cross-VLAN access, subinterface debugging