"Illuminating the shadows of the Internet" Opportunistic network and web measurement Home •• Project home page Overview •• Brief overview and news FAQ •• Frequently-asked questions Pubs •• Publications and people Stats •• Preliminary results Maps Proxies •• Data coverage and proxy maps Contribute •• Join our community Usage Information If you have a webpage, you can help with our measurements! All you need to do is include some link on your webpage using the following bits of HTML. <iframe src="http://www.cdn.coralcdn.org/noredirect.html" frameborder=0 scrolling=no marginwidth=0 marginheight=0 width=1 height=1> </iframe> This causes your users to download and run a small Java applet in the background. It does not affect the layout of your pages in any way. (Note that all pages on this site include such a link -- check the end of this page's HTML source.) The Java applet simply issues an HTTP GET request back to our hosting servers, sending back the client's local IP address and port number associated with the outgoing socket connection. The applet is only a few lines of Java code and less than 2K in size. The only effect that may be noticeable to users is the startup time for the Java virtual machine and a brief "loading" message in the browser status field. If you want to help with our DNS study, but don't want to have your users download and run our little Java applet, you can simply use the following "diet" version instead: <iframe src="http://www.cdn.coralcdn.org/noredirect.diet.html" frameborder=0 scrolling=no marginwidth=0 marginheight=0 width=1 height=1> </iframe> This simply issues a normal HTTP GET request to our servers; nothing more. Our research---and our understanding of the peculiarities of the Internet and Web---thanks you for your help!