I'm doing some network tracing today - a client has an ADSL router that looks to be configured wrongly. So I'm in search of tools that will allow me to ping/tracert/telnet into the network from an external source. Here are some of the tools I've found that were useful:
First in my search was Online IP-Tools @ msv.dk . I used the Visual Tracert, and some of the other IP tools. The port scanner only partly worked, however. Still, some useful tools.