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Default TTL values for various operating systems
DNSreport.com Think your dns server is
configured properly? Check it and make sure. Then, check your
other lookups (reverse dns, WHOIS, IP
routing, CIDR/Netmask, etc.)
Treachery Unlimited
Packet Storm security portal
Port Lookup Utility
(Note: PDF file) Solaris
Common Messages and Troubleshooting Guide
TSG MAC address search tool
Identify the manufacturer of a suspicious network attached device
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