Network troubleshooting tools

Recently, there was a thread on the NANOG list asking what were somne favorite network troubleshooting tools. I have taken many of these tools and created the following list.
Simple pingport and dig commands
BGP Looking glass
Traceroute from various hosts on the net
IPV6 tools (ping,traceroute,etc)
Carious DNS tools
Routing Registry object explorer
DNS and Mail tools

j2networks family of sites
#packetsdownrange #routethelight
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