site_archiver@lists.apple.com Delivered-To: Macnetworkprog@lists.apple.com On Sep 23, 2005, at 17:42 , Mark Dawson wrote: Bonjour will only let you discover registered systems (AFAIK). Hope this helps. Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large Institute for General Semantics -------- Experience is what you get when you don't get what you want. -------- _______________________________________________ Do not post admin requests to the list. They will be ignored. Macnetworkprog mailing list (Macnetworkprog@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/macnetworkprog/site_archiver%40lists.... I'm new to networking (did a little Open Transport many years back), and would like to create a simple app--a diagnostic that finds all the nodes on my local network, plus some remote (such as www.apple.com and www.google.com). The app would then "ping" those addresses on command--just a quick way to verify whether I've lost my DSL connection or something internal to my network. I found the "simplePing" program that works to ping hosts (and figures out what the IP address is of "www.apple.com"). However, I wasn't sure how to figure out the local network addresses. I wasn't sure if Bonjour was the way to go. Any ideas? It's not easy to discover all "local" addresses without some administrative help (typing them in). One idea, often frowned on by network admins, is local broadcast pings (e.g., if your network is 192.168.21/8, then ping 192.168.21.255). It is unreliable for several reasons (systems may not respond; systems may not receive the ping,; ...). I'd also like some pointers on where to look to learn more about Mac (or general) networking--I'm not sure where a starting point is. I know I need to understand better sockets, but I'm sure there's more :) I picked my "network" ping app more because I could find it useful (maybe there already is something like that?) but more importantly, I thought it would be a good introduction into networking… The best place to start is the books by W. Richard Stevens, "Unix Network Programming". Vol. 1 of the 2nd edition has an excellent treatment of the subject. It's a bit dated, but still valuable. There is a 3rd edition of this book, written by others (Stevens died several years ago). It has more recent content, has received high marks from others, but I have not read it. In addition, Stevens' website (<http://www.kohala.com>) has tarballs of code for networking and other aspects of Unix programming. His code is worth looking at, as examples of how to implement various functions. This email sent to site_archiver@lists.apple.com