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What online networking troubleshooting tools do you find indispensable and why?

The one that I use the most often is network-tools.com because it does ping, DNS lookups, tracetorutes, and email SMTP testing but I'm always looking for better tools.

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closed as off topic by 8088, Nifle, Daniel Beck, slhck, Sathya Sep 27 '11 at 14:54

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Please make this a community wiki –  Diago Jul 18 '09 at 21:17
I have a Mac, so I don't need troubleshooting XD –  David Pearce Jul 19 '09 at 0:36

5 Answers 5

I have used the following things quite regularly.
While the primary points are noted besides each reference,
there are sometime quite a few secondary uses too.

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Whenever I have mail or DNS questions, I always turn to a quick run-down with IntoDNS. Not only does it spot problems, but it also gives suggestions for remediation. Very handy when you're hurried and could easily overlook a detail.

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I use www.geektools.com, but I think I'm switching to your choice, network-tools.com, because it tells me my ip address right off the bat. Thanks.

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I use nmap regularly. It is most useful to find out what kind of device is behind an IP address and what services the device offers.

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http://iptools.com/ has some array of tools.

Also, http://www.robtex.com/ is good for non trivial stuff (like finding out some of the host names on a given IP)

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