Automating Canadian ASN discovery using Blockfinder: daily diff emails tracking ARIN assignments, patching TTY progress bar issues for cron jobs, and proposing ARIN's arin-issued list for AS numbers (later implemented).
Tracking down rogue DHCP server on corporate network: using arpwatch to identify Mac sharing causing 192.168.137.x leases, correlating MAC to CDP/switch port, and why DHCP snooping prevents these issues.
Responding to POODLE vulnerability by disabling SSLv3 across all services: enforcing TLSv1.0+, updating cipher suites from Mozilla wiki, logging protocol/cipher combinations to verify modern client support.
