Today we're very happy to announce public availability of the ICSI Netalyzr. Our goal was to build a service that shows you in detail what's up with your network connection, whatever network you might find yourself in, whenever something's not working, or when you're simply curious. The numerous tests conducted by the Netalyzr include HTTP proxy discovery, HTTP caching behavior, NAT detection, TCP & UDP port filtering, DNS resolver behavior, IPv6 connectivity, connection latency, bandwidth, and buffer properties, and more.
All you need is a Java-enabled browser and a visit to http://netalyzr.icsi.berkeley.edu.
We hope you'll find the site as useful as we do. We're very keen to hear your feedback, whether it's interesting results, suggestions for improvements, or any issues you've encountered.
Go forth and netalyze!