I just thought I'd mention a couple of nice multiplatform network tools that I don't like to live without.
Wireshark/Ethereal: A very comprehensive network sniffer and protocol analyzer. (Wireshark is the current name for the product). It's free, open source, and supported on numerous Windows, Linux, and UNIX platforms. Get it at www.wireshark.org
NMAP: A simple to use but powerful network portscanning tool. Also free, also runs on just about every platform out there. I've found that I like the Windows-based frontend ZenMAP (which comes packaged with the product). Give an IP range, tell it what kind of scan to run, and let it rip.
NetCat: Beware, Symantec AV thinks this is a "hacking tool" and deletes it - which is totally ridiculous. NetCat is the swiss army knife of tools for power users. Basically, you run it on two hosts, and you can shove any kind of network traffic through it that you'd like. It _could_ be used as a hacking tool, but personally, I use it to do some lovely network cloning of Linux or UNIX hosts from one box to another. Tar a whole system up, pipe it into netcat on one side, pipe from netcat to untar on the other box. Spectacular!
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